1308 lines
55 KiB
JavaScript
1308 lines
55 KiB
JavaScript
/**
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* @fileoverview Mocha/Jest test wrapper
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* @author Ilya Volodin
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*/
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"use strict";
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/* globals describe, it -- Mocha globals */
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const
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assert = require("node:assert"),
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util = require("node:util"),
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path = require("node:path"),
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equal = require("fast-deep-equal"),
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Traverser = require("../shared/traverser"),
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{ getRuleOptionsSchema } = require("../config/flat-config-helpers"),
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{ Linter, SourceCodeFixer } = require("../linter"),
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{ interpolate, getPlaceholderMatcher } = require("../linter/interpolate"),
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stringify = require("json-stable-stringify-without-jsonify");
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const { FlatConfigArray } = require("../config/flat-config-array");
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const { defaultConfig } = require("../config/default-config");
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const ajv = require("../shared/ajv")({ strictDefaults: true });
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const parserSymbol = Symbol.for("eslint.RuleTester.parser");
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const { ConfigArraySymbol } = require("@eslint/config-array");
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const { isSerializable } = require("../shared/serialization");
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const jslang = require("../languages/js");
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const { SourceCode } = require("../languages/js/source-code");
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//------------------------------------------------------------------------------
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// Typedefs
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//------------------------------------------------------------------------------
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/** @typedef {import("../shared/types").Parser} Parser */
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/** @typedef {import("../shared/types").LanguageOptions} LanguageOptions */
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/** @typedef {import("../shared/types").Rule} Rule */
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/**
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* A test case that is expected to pass lint.
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* @typedef {Object} ValidTestCase
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* @property {string} [name] Name for the test case.
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* @property {string} code Code for the test case.
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* @property {any[]} [options] Options for the test case.
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* @property {Function} [before] Function to execute before testing the case.
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* @property {Function} [after] Function to execute after testing the case regardless of its result.
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* @property {LanguageOptions} [languageOptions] The language options to use in the test case.
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* @property {{ [name: string]: any }} [settings] Settings for the test case.
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* @property {string} [filename] The fake filename for the test case. Useful for rules that make assertion about filenames.
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* @property {boolean} [only] Run only this test case or the subset of test cases with this property.
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*/
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/**
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* A test case that is expected to fail lint.
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* @typedef {Object} InvalidTestCase
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* @property {string} [name] Name for the test case.
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* @property {string} code Code for the test case.
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* @property {number | Array<TestCaseError | string | RegExp>} errors Expected errors.
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* @property {string | null} [output] The expected code after autofixes are applied. If set to `null`, the test runner will assert that no autofix is suggested.
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* @property {any[]} [options] Options for the test case.
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* @property {Function} [before] Function to execute before testing the case.
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* @property {Function} [after] Function to execute after testing the case regardless of its result.
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* @property {{ [name: string]: any }} [settings] Settings for the test case.
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* @property {string} [filename] The fake filename for the test case. Useful for rules that make assertion about filenames.
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* @property {LanguageOptions} [languageOptions] The language options to use in the test case.
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* @property {boolean} [only] Run only this test case or the subset of test cases with this property.
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*/
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/**
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* A description of a reported error used in a rule tester test.
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* @typedef {Object} TestCaseError
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* @property {string | RegExp} [message] Message.
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* @property {string} [messageId] Message ID.
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* @property {string} [type] The type of the reported AST node.
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* @property {{ [name: string]: string }} [data] The data used to fill the message template.
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* @property {number} [line] The 1-based line number of the reported start location.
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* @property {number} [column] The 1-based column number of the reported start location.
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* @property {number} [endLine] The 1-based line number of the reported end location.
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* @property {number} [endColumn] The 1-based column number of the reported end location.
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*/
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//------------------------------------------------------------------------------
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// Private Members
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//------------------------------------------------------------------------------
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/*
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* testerDefaultConfig must not be modified as it allows to reset the tester to
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* the initial default configuration
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*/
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const testerDefaultConfig = { rules: {} };
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/*
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* RuleTester uses this config as its default. This can be overwritten via
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* setDefaultConfig().
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*/
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let sharedDefaultConfig = { rules: {} };
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/*
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* List every parameters possible on a test case that are not related to eslint
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* configuration
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*/
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const RuleTesterParameters = [
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"name",
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"code",
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"filename",
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"options",
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"before",
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"after",
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"errors",
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"output",
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"only"
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];
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/*
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* All allowed property names in error objects.
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*/
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const errorObjectParameters = new Set([
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"message",
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"messageId",
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"data",
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"type",
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"line",
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"column",
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"endLine",
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"endColumn",
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"suggestions"
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]);
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const friendlyErrorObjectParameterList = `[${[...errorObjectParameters].map(key => `'${key}'`).join(", ")}]`;
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/*
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* All allowed property names in suggestion objects.
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*/
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const suggestionObjectParameters = new Set([
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"desc",
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"messageId",
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"data",
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"output"
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]);
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const friendlySuggestionObjectParameterList = `[${[...suggestionObjectParameters].map(key => `'${key}'`).join(", ")}]`;
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/*
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* Ignored test case properties when checking for test case duplicates.
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*/
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const duplicationIgnoredParameters = new Set([
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"name",
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"errors",
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"output"
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]);
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const forbiddenMethods = [
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"applyInlineConfig",
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"applyLanguageOptions",
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"finalize"
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];
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/** @type {Map<string,WeakSet>} */
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const forbiddenMethodCalls = new Map(forbiddenMethods.map(methodName => ([methodName, new WeakSet()])));
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const hasOwnProperty = Function.call.bind(Object.hasOwnProperty);
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/**
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* Clones a given value deeply.
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* Note: This ignores `parent` property.
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* @param {any} x A value to clone.
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* @returns {any} A cloned value.
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*/
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function cloneDeeplyExcludesParent(x) {
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if (typeof x === "object" && x !== null) {
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if (Array.isArray(x)) {
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return x.map(cloneDeeplyExcludesParent);
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}
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const retv = {};
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for (const key in x) {
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if (key !== "parent" && hasOwnProperty(x, key)) {
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retv[key] = cloneDeeplyExcludesParent(x[key]);
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}
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}
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return retv;
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}
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return x;
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}
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/**
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* Freezes a given value deeply.
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* @param {any} x A value to freeze.
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* @returns {void}
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*/
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function freezeDeeply(x) {
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if (typeof x === "object" && x !== null) {
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if (Array.isArray(x)) {
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x.forEach(freezeDeeply);
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} else {
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for (const key in x) {
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if (key !== "parent" && hasOwnProperty(x, key)) {
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freezeDeeply(x[key]);
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}
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}
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}
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Object.freeze(x);
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}
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}
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/**
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* Replace control characters by `\u00xx` form.
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* @param {string} text The text to sanitize.
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* @returns {string} The sanitized text.
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*/
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function sanitize(text) {
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if (typeof text !== "string") {
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return "";
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}
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return text.replace(
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/[\u0000-\u0009\u000b-\u001a]/gu, // eslint-disable-line no-control-regex -- Escaping controls
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c => `\\u${c.codePointAt(0).toString(16).padStart(4, "0")}`
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);
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}
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/**
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* Define `start`/`end` properties as throwing error.
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* @param {string} objName Object name used for error messages.
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* @param {ASTNode} node The node to define.
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* @returns {void}
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*/
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function defineStartEndAsError(objName, node) {
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Object.defineProperties(node, {
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start: {
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get() {
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throw new Error(`Use ${objName}.range[0] instead of ${objName}.start`);
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},
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configurable: true,
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enumerable: false
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},
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end: {
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get() {
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throw new Error(`Use ${objName}.range[1] instead of ${objName}.end`);
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},
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configurable: true,
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enumerable: false
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}
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});
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}
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/**
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* Define `start`/`end` properties of all nodes of the given AST as throwing error.
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* @param {ASTNode} ast The root node to errorize `start`/`end` properties.
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* @param {Object} [visitorKeys] Visitor keys to be used for traversing the given ast.
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* @returns {void}
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*/
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function defineStartEndAsErrorInTree(ast, visitorKeys) {
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Traverser.traverse(ast, { visitorKeys, enter: defineStartEndAsError.bind(null, "node") });
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ast.tokens.forEach(defineStartEndAsError.bind(null, "token"));
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ast.comments.forEach(defineStartEndAsError.bind(null, "token"));
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}
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/**
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* Wraps the given parser in order to intercept and modify return values from the `parse` and `parseForESLint` methods, for test purposes.
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* In particular, to modify ast nodes, tokens and comments to throw on access to their `start` and `end` properties.
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* @param {Parser} parser Parser object.
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* @returns {Parser} Wrapped parser object.
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*/
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function wrapParser(parser) {
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if (typeof parser.parseForESLint === "function") {
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return {
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[parserSymbol]: parser,
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parseForESLint(...args) {
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const ret = parser.parseForESLint(...args);
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defineStartEndAsErrorInTree(ret.ast, ret.visitorKeys);
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return ret;
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}
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};
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}
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return {
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[parserSymbol]: parser,
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parse(...args) {
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const ast = parser.parse(...args);
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defineStartEndAsErrorInTree(ast);
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return ast;
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}
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};
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}
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/**
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* Function to replace forbidden `SourceCode` methods. Allows just one call per method.
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* @param {string} methodName The name of the method to forbid.
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* @param {Function} prototype The prototype with the original method to call.
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* @returns {Function} The function that throws the error.
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*/
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function throwForbiddenMethodError(methodName, prototype) {
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const original = prototype[methodName];
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return function(...args) {
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const called = forbiddenMethodCalls.get(methodName);
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/* eslint-disable no-invalid-this -- needed to operate as a method. */
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if (!called.has(this)) {
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called.add(this);
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return original.apply(this, args);
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}
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/* eslint-enable no-invalid-this -- not needed past this point */
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throw new Error(
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`\`SourceCode#${methodName}()\` cannot be called inside a rule.`
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);
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};
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}
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/**
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* Extracts names of {{ placeholders }} from the reported message.
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* @param {string} message Reported message
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* @returns {string[]} Array of placeholder names
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*/
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function getMessagePlaceholders(message) {
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const matcher = getPlaceholderMatcher();
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return Array.from(message.matchAll(matcher), ([, name]) => name.trim());
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}
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/**
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* Returns the placeholders in the reported messages but
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* only includes the placeholders available in the raw message and not in the provided data.
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* @param {string} message The reported message
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* @param {string} raw The raw message specified in the rule meta.messages
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* @param {undefined|Record<unknown, unknown>} data The passed
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* @returns {string[]} Missing placeholder names
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*/
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function getUnsubstitutedMessagePlaceholders(message, raw, data = {}) {
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const unsubstituted = getMessagePlaceholders(message);
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if (unsubstituted.length === 0) {
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return [];
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}
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// Remove false positives by only counting placeholders in the raw message, which were not provided in the data matcher or added with a data property
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const known = getMessagePlaceholders(raw);
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const provided = Object.keys(data);
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return unsubstituted.filter(name => known.includes(name) && !provided.includes(name));
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}
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const metaSchemaDescription = `
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\t- If the rule has options, set \`meta.schema\` to an array or non-empty object to enable options validation.
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\t- If the rule doesn't have options, omit \`meta.schema\` to enforce that no options can be passed to the rule.
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\t- You can also set \`meta.schema\` to \`false\` to opt-out of options validation (not recommended).
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\thttps://eslint.org/docs/latest/extend/custom-rules#options-schemas
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`;
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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// default separators for testing
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const DESCRIBE = Symbol("describe");
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const IT = Symbol("it");
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const IT_ONLY = Symbol("itOnly");
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/**
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* This is `it` default handler if `it` don't exist.
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* @this {Mocha}
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* @param {string} text The description of the test case.
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* @param {Function} method The logic of the test case.
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* @throws {Error} Any error upon execution of `method`.
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* @returns {any} Returned value of `method`.
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*/
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function itDefaultHandler(text, method) {
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try {
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return method.call(this);
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} catch (err) {
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if (err instanceof assert.AssertionError) {
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err.message += ` (${util.inspect(err.actual)} ${err.operator} ${util.inspect(err.expected)})`;
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}
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throw err;
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}
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}
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/**
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* This is `describe` default handler if `describe` don't exist.
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* @this {Mocha}
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* @param {string} text The description of the test case.
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* @param {Function} method The logic of the test case.
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* @returns {any} Returned value of `method`.
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*/
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function describeDefaultHandler(text, method) {
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return method.call(this);
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}
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/**
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* Mocha test wrapper.
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*/
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class RuleTester {
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/**
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* Creates a new instance of RuleTester.
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* @param {Object} [testerConfig] Optional, extra configuration for the tester
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*/
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constructor(testerConfig = {}) {
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/**
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* The configuration to use for this tester. Combination of the tester
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* configuration and the default configuration.
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* @type {Object}
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*/
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this.testerConfig = [
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sharedDefaultConfig,
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testerConfig,
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{ rules: { "rule-tester/validate-ast": "error" } }
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];
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this.linter = new Linter({ configType: "flat" });
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}
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/**
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* Set the configuration to use for all future tests
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* @param {Object} config the configuration to use.
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* @throws {TypeError} If non-object config.
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* @returns {void}
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*/
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static setDefaultConfig(config) {
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if (typeof config !== "object" || config === null) {
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throw new TypeError("RuleTester.setDefaultConfig: config must be an object");
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}
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sharedDefaultConfig = config;
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// Make sure the rules object exists since it is assumed to exist later
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sharedDefaultConfig.rules = sharedDefaultConfig.rules || {};
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}
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|
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/**
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* Get the current configuration used for all tests
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* @returns {Object} the current configuration
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*/
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static getDefaultConfig() {
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return sharedDefaultConfig;
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}
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|
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/**
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* Reset the configuration to the initial configuration of the tester removing
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* any changes made until now.
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* @returns {void}
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*/
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static resetDefaultConfig() {
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sharedDefaultConfig = {
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rules: {
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...testerDefaultConfig.rules
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}
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};
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}
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|
|
|
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/*
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* If people use `mocha test.js --watch` command, `describe` and `it` function
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* instances are different for each execution. So `describe` and `it` should get fresh instance
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* always.
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*/
|
|
static get describe() {
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return (
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this[DESCRIBE] ||
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(typeof describe === "function" ? describe : describeDefaultHandler)
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);
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}
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|
|
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static set describe(value) {
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this[DESCRIBE] = value;
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}
|
|
|
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static get it() {
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return (
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this[IT] ||
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(typeof it === "function" ? it : itDefaultHandler)
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);
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}
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|
|
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static set it(value) {
|
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this[IT] = value;
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}
|
|
|
|
/**
|
|
* Adds the `only` property to a test to run it in isolation.
|
|
* @param {string | ValidTestCase | InvalidTestCase} item A single test to run by itself.
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|
* @returns {ValidTestCase | InvalidTestCase} The test with `only` set.
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*/
|
|
static only(item) {
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if (typeof item === "string") {
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return { code: item, only: true };
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}
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|
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return { ...item, only: true };
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}
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|
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static get itOnly() {
|
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if (typeof this[IT_ONLY] === "function") {
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return this[IT_ONLY];
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}
|
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if (typeof this[IT] === "function" && typeof this[IT].only === "function") {
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return Function.bind.call(this[IT].only, this[IT]);
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}
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if (typeof it === "function" && typeof it.only === "function") {
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return Function.bind.call(it.only, it);
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}
|
|
|
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if (typeof this[DESCRIBE] === "function" || typeof this[IT] === "function") {
|
|
throw new Error(
|
|
"Set `RuleTester.itOnly` to use `only` with a custom test framework.\n" +
|
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"See https://eslint.org/docs/latest/integrate/nodejs-api#customizing-ruletester for more."
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);
|
|
}
|
|
if (typeof it === "function") {
|
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throw new Error("The current test framework does not support exclusive tests with `only`.");
|
|
}
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throw new Error("To use `only`, use RuleTester with a test framework that provides `it.only()` like Mocha.");
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}
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|
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static set itOnly(value) {
|
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this[IT_ONLY] = value;
|
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}
|
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|
|
|
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/**
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|
* Adds a new rule test to execute.
|
|
* @param {string} ruleName The name of the rule to run.
|
|
* @param {Rule} rule The rule to test.
|
|
* @param {{
|
|
* valid: (ValidTestCase | string)[],
|
|
* invalid: InvalidTestCase[]
|
|
* }} test The collection of tests to run.
|
|
* @throws {TypeError|Error} If `rule` is not an object with a `create` method,
|
|
* or if non-object `test`, or if a required scenario of the given type is missing.
|
|
* @returns {void}
|
|
*/
|
|
run(ruleName, rule, test) {
|
|
|
|
const testerConfig = this.testerConfig,
|
|
requiredScenarios = ["valid", "invalid"],
|
|
scenarioErrors = [],
|
|
linter = this.linter,
|
|
ruleId = `rule-to-test/${ruleName}`;
|
|
|
|
const seenValidTestCases = new Set();
|
|
const seenInvalidTestCases = new Set();
|
|
|
|
if (!rule || typeof rule !== "object" || typeof rule.create !== "function") {
|
|
throw new TypeError("Rule must be an object with a `create` method");
|
|
}
|
|
|
|
if (!test || typeof test !== "object") {
|
|
throw new TypeError(`Test Scenarios for rule ${ruleName} : Could not find test scenario object`);
|
|
}
|
|
|
|
requiredScenarios.forEach(scenarioType => {
|
|
if (!test[scenarioType]) {
|
|
scenarioErrors.push(`Could not find any ${scenarioType} test scenarios`);
|
|
}
|
|
});
|
|
|
|
if (scenarioErrors.length > 0) {
|
|
throw new Error([
|
|
`Test Scenarios for rule ${ruleName} is invalid:`
|
|
].concat(scenarioErrors).join("\n"));
|
|
}
|
|
|
|
const baseConfig = [
|
|
{ files: ["**"] }, // Make sure the default config matches for all files
|
|
{
|
|
plugins: {
|
|
|
|
// copy root plugin over
|
|
"@": {
|
|
|
|
/*
|
|
* Parsers are wrapped to detect more errors, so this needs
|
|
* to be a new object for each call to run(), otherwise the
|
|
* parsers will be wrapped multiple times.
|
|
*/
|
|
parsers: {
|
|
...defaultConfig[0].plugins["@"].parsers
|
|
},
|
|
|
|
/*
|
|
* The rules key on the default plugin is a proxy to lazy-load
|
|
* just the rules that are needed. So, don't create a new object
|
|
* here, just use the default one to keep that performance
|
|
* enhancement.
|
|
*/
|
|
rules: defaultConfig[0].plugins["@"].rules,
|
|
languages: defaultConfig[0].plugins["@"].languages
|
|
},
|
|
"rule-to-test": {
|
|
rules: {
|
|
[ruleName]: Object.assign({}, rule, {
|
|
|
|
// Create a wrapper rule that freezes the `context` properties.
|
|
create(context) {
|
|
freezeDeeply(context.options);
|
|
freezeDeeply(context.settings);
|
|
freezeDeeply(context.parserOptions);
|
|
|
|
// freezeDeeply(context.languageOptions);
|
|
|
|
return rule.create(context);
|
|
}
|
|
})
|
|
}
|
|
}
|
|
},
|
|
language: defaultConfig[0].language
|
|
},
|
|
...defaultConfig.slice(1)
|
|
];
|
|
|
|
/**
|
|
* Runs a hook on the given item when it's assigned to the given property
|
|
* @param {string|Object} item Item to run the hook on
|
|
* @param {string} prop The property having the hook assigned to
|
|
* @throws {Error} If the property is not a function or that function throws an error
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function runHook(item, prop) {
|
|
if (typeof item === "object" && hasOwnProperty(item, prop)) {
|
|
assert.strictEqual(typeof item[prop], "function", `Optional test case property '${prop}' must be a function`);
|
|
item[prop]();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Run the rule for the given item
|
|
* @param {string|Object} item Item to run the rule against
|
|
* @throws {Error} If an invalid schema.
|
|
* @returns {Object} Eslint run result
|
|
* @private
|
|
*/
|
|
function runRuleForItem(item) {
|
|
const flatConfigArrayOptions = {
|
|
baseConfig
|
|
};
|
|
|
|
if (item.filename) {
|
|
flatConfigArrayOptions.basePath = path.parse(item.filename).root || void 0;
|
|
}
|
|
|
|
const configs = new FlatConfigArray(testerConfig, flatConfigArrayOptions);
|
|
|
|
/*
|
|
* Modify the returned config so that the parser is wrapped to catch
|
|
* access of the start/end properties. This method is called just
|
|
* once per code snippet being tested, so each test case gets a clean
|
|
* parser.
|
|
*/
|
|
configs[ConfigArraySymbol.finalizeConfig] = function(...args) {
|
|
|
|
// can't do super here :(
|
|
const proto = Object.getPrototypeOf(this);
|
|
const calculatedConfig = proto[ConfigArraySymbol.finalizeConfig].apply(this, args);
|
|
|
|
// wrap the parser to catch start/end property access
|
|
if (calculatedConfig.language === jslang) {
|
|
calculatedConfig.languageOptions.parser = wrapParser(calculatedConfig.languageOptions.parser);
|
|
}
|
|
|
|
return calculatedConfig;
|
|
};
|
|
|
|
let code, filename, output, beforeAST, afterAST;
|
|
|
|
if (typeof item === "string") {
|
|
code = item;
|
|
} else {
|
|
code = item.code;
|
|
|
|
/*
|
|
* Assumes everything on the item is a config except for the
|
|
* parameters used by this tester
|
|
*/
|
|
const itemConfig = { ...item };
|
|
|
|
for (const parameter of RuleTesterParameters) {
|
|
delete itemConfig[parameter];
|
|
}
|
|
|
|
/*
|
|
* Create the config object from the tester config and this item
|
|
* specific configurations.
|
|
*/
|
|
configs.push(itemConfig);
|
|
}
|
|
|
|
if (hasOwnProperty(item, "only")) {
|
|
assert.ok(typeof item.only === "boolean", "Optional test case property 'only' must be a boolean");
|
|
}
|
|
if (hasOwnProperty(item, "filename")) {
|
|
assert.ok(typeof item.filename === "string", "Optional test case property 'filename' must be a string");
|
|
filename = item.filename;
|
|
}
|
|
|
|
let ruleConfig = 1;
|
|
|
|
if (hasOwnProperty(item, "options")) {
|
|
assert(Array.isArray(item.options), "options must be an array");
|
|
ruleConfig = [1, ...item.options];
|
|
}
|
|
|
|
configs.push({
|
|
rules: {
|
|
[ruleId]: ruleConfig
|
|
}
|
|
});
|
|
|
|
let schema;
|
|
|
|
try {
|
|
schema = getRuleOptionsSchema(rule);
|
|
} catch (err) {
|
|
err.message += metaSchemaDescription;
|
|
throw err;
|
|
}
|
|
|
|
/*
|
|
* Check and throw an error if the schema is an empty object (`schema:{}`), because such schema
|
|
* doesn't validate or enforce anything and is therefore considered a possible error. If the intent
|
|
* was to skip options validation, `schema:false` should be set instead (explicit opt-out).
|
|
*
|
|
* For this purpose, a schema object is considered empty if it doesn't have any own enumerable string-keyed
|
|
* properties. While `ajv.compile()` does use enumerable properties from the prototype chain as well,
|
|
* it caches compiled schemas by serializing only own enumerable properties, so it's generally not a good idea
|
|
* to use inherited properties in schemas because schemas that differ only in inherited properties would end up
|
|
* having the same cache entry that would be correct for only one of them.
|
|
*
|
|
* At this point, `schema` can only be an object or `null`.
|
|
*/
|
|
if (schema && Object.keys(schema).length === 0) {
|
|
throw new Error(`\`schema: {}\` is a no-op${metaSchemaDescription}`);
|
|
}
|
|
|
|
/*
|
|
* Setup AST getters.
|
|
* The goal is to check whether or not AST was modified when
|
|
* running the rule under test.
|
|
*/
|
|
configs.push({
|
|
plugins: {
|
|
"rule-tester": {
|
|
rules: {
|
|
"validate-ast": {
|
|
create() {
|
|
return {
|
|
Program(node) {
|
|
beforeAST = cloneDeeplyExcludesParent(node);
|
|
},
|
|
"Program:exit"(node) {
|
|
afterAST = node;
|
|
}
|
|
};
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
if (schema) {
|
|
ajv.validateSchema(schema);
|
|
|
|
if (ajv.errors) {
|
|
const errors = ajv.errors.map(error => {
|
|
const field = error.dataPath[0] === "." ? error.dataPath.slice(1) : error.dataPath;
|
|
|
|
return `\t${field}: ${error.message}`;
|
|
}).join("\n");
|
|
|
|
throw new Error([`Schema for rule ${ruleName} is invalid:`, errors]);
|
|
}
|
|
|
|
/*
|
|
* `ajv.validateSchema` checks for errors in the structure of the schema (by comparing the schema against a "meta-schema"),
|
|
* and it reports those errors individually. However, there are other types of schema errors that only occur when compiling
|
|
* the schema (e.g. using invalid defaults in a schema), and only one of these errors can be reported at a time. As a result,
|
|
* the schema is compiled here separately from checking for `validateSchema` errors.
|
|
*/
|
|
try {
|
|
ajv.compile(schema);
|
|
} catch (err) {
|
|
throw new Error(`Schema for rule ${ruleName} is invalid: ${err.message}`);
|
|
}
|
|
}
|
|
|
|
// check for validation errors
|
|
try {
|
|
configs.normalizeSync();
|
|
configs.getConfig("test.js");
|
|
} catch (error) {
|
|
error.message = `ESLint configuration in rule-tester is invalid: ${error.message}`;
|
|
throw error;
|
|
}
|
|
|
|
// Verify the code.
|
|
const { applyLanguageOptions, applyInlineConfig, finalize } = SourceCode.prototype;
|
|
let messages;
|
|
|
|
try {
|
|
forbiddenMethods.forEach(methodName => {
|
|
SourceCode.prototype[methodName] = throwForbiddenMethodError(methodName, SourceCode.prototype);
|
|
});
|
|
|
|
messages = linter.verify(code, configs, filename);
|
|
} finally {
|
|
SourceCode.prototype.applyInlineConfig = applyInlineConfig;
|
|
SourceCode.prototype.applyLanguageOptions = applyLanguageOptions;
|
|
SourceCode.prototype.finalize = finalize;
|
|
}
|
|
|
|
|
|
const fatalErrorMessage = messages.find(m => m.fatal);
|
|
|
|
assert(!fatalErrorMessage, `A fatal parsing error occurred: ${fatalErrorMessage && fatalErrorMessage.message}`);
|
|
|
|
// Verify if autofix makes a syntax error or not.
|
|
if (messages.some(m => m.fix)) {
|
|
output = SourceCodeFixer.applyFixes(code, messages).output;
|
|
const errorMessageInFix = linter.verify(output, configs, filename).find(m => m.fatal);
|
|
|
|
assert(!errorMessageInFix, [
|
|
"A fatal parsing error occurred in autofix.",
|
|
`Error: ${errorMessageInFix && errorMessageInFix.message}`,
|
|
"Autofix output:",
|
|
output
|
|
].join("\n"));
|
|
} else {
|
|
output = code;
|
|
}
|
|
|
|
return {
|
|
messages,
|
|
output,
|
|
beforeAST,
|
|
afterAST: cloneDeeplyExcludesParent(afterAST),
|
|
configs,
|
|
filename
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Check if the AST was changed
|
|
* @param {ASTNode} beforeAST AST node before running
|
|
* @param {ASTNode} afterAST AST node after running
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function assertASTDidntChange(beforeAST, afterAST) {
|
|
if (!equal(beforeAST, afterAST)) {
|
|
assert.fail("Rule should not modify AST.");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if this test case is a duplicate of one we have seen before.
|
|
* @param {string|Object} item test case object
|
|
* @param {Set<string>} seenTestCases set of serialized test cases we have seen so far (managed by this function)
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function checkDuplicateTestCase(item, seenTestCases) {
|
|
if (!isSerializable(item)) {
|
|
|
|
/*
|
|
* If we can't serialize a test case (because it contains a function, RegExp, etc), skip the check.
|
|
* This might happen with properties like: options, plugins, settings, languageOptions.parser, languageOptions.parserOptions.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
const normalizedItem = typeof item === "string" ? { code: item } : item;
|
|
const serializedTestCase = stringify(normalizedItem, {
|
|
replacer(key, value) {
|
|
|
|
// "this" is the currently stringified object --> only ignore top-level properties
|
|
return (normalizedItem !== this || !duplicationIgnoredParameters.has(key)) ? value : void 0;
|
|
}
|
|
});
|
|
|
|
assert(
|
|
!seenTestCases.has(serializedTestCase),
|
|
"detected duplicate test case"
|
|
);
|
|
seenTestCases.add(serializedTestCase);
|
|
}
|
|
|
|
/**
|
|
* Check if the template is valid or not
|
|
* all valid cases go through this
|
|
* @param {string|Object} item Item to run the rule against
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function testValidTemplate(item) {
|
|
const code = typeof item === "object" ? item.code : item;
|
|
|
|
assert.ok(typeof code === "string", "Test case must specify a string value for 'code'");
|
|
if (item.name) {
|
|
assert.ok(typeof item.name === "string", "Optional test case property 'name' must be a string");
|
|
}
|
|
|
|
checkDuplicateTestCase(item, seenValidTestCases);
|
|
|
|
const result = runRuleForItem(item);
|
|
const messages = result.messages;
|
|
|
|
assert.strictEqual(messages.length, 0, util.format("Should have no errors but had %d: %s",
|
|
messages.length,
|
|
util.inspect(messages)));
|
|
|
|
assertASTDidntChange(result.beforeAST, result.afterAST);
|
|
}
|
|
|
|
/**
|
|
* Asserts that the message matches its expected value. If the expected
|
|
* value is a regular expression, it is checked against the actual
|
|
* value.
|
|
* @param {string} actual Actual value
|
|
* @param {string|RegExp} expected Expected value
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function assertMessageMatches(actual, expected) {
|
|
if (expected instanceof RegExp) {
|
|
|
|
// assert.js doesn't have a built-in RegExp match function
|
|
assert.ok(
|
|
expected.test(actual),
|
|
`Expected '${actual}' to match ${expected}`
|
|
);
|
|
} else {
|
|
assert.strictEqual(actual, expected);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if the template is invalid or not
|
|
* all invalid cases go through this.
|
|
* @param {string|Object} item Item to run the rule against
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function testInvalidTemplate(item) {
|
|
assert.ok(typeof item.code === "string", "Test case must specify a string value for 'code'");
|
|
if (item.name) {
|
|
assert.ok(typeof item.name === "string", "Optional test case property 'name' must be a string");
|
|
}
|
|
assert.ok(item.errors || item.errors === 0,
|
|
`Did not specify errors for an invalid test of ${ruleName}`);
|
|
|
|
if (Array.isArray(item.errors) && item.errors.length === 0) {
|
|
assert.fail("Invalid cases must have at least one error");
|
|
}
|
|
|
|
checkDuplicateTestCase(item, seenInvalidTestCases);
|
|
|
|
const ruleHasMetaMessages = hasOwnProperty(rule, "meta") && hasOwnProperty(rule.meta, "messages");
|
|
const friendlyIDList = ruleHasMetaMessages ? `[${Object.keys(rule.meta.messages).map(key => `'${key}'`).join(", ")}]` : null;
|
|
|
|
const result = runRuleForItem(item);
|
|
const messages = result.messages;
|
|
|
|
for (const message of messages) {
|
|
if (hasOwnProperty(message, "suggestions")) {
|
|
|
|
/** @type {Map<string, number>} */
|
|
const seenMessageIndices = new Map();
|
|
|
|
for (let i = 0; i < message.suggestions.length; i += 1) {
|
|
const suggestionMessage = message.suggestions[i].desc;
|
|
const previous = seenMessageIndices.get(suggestionMessage);
|
|
|
|
assert.ok(!seenMessageIndices.has(suggestionMessage), `Suggestion message '${suggestionMessage}' reported from suggestion ${i} was previously reported by suggestion ${previous}. Suggestion messages should be unique within an error.`);
|
|
seenMessageIndices.set(suggestionMessage, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (typeof item.errors === "number") {
|
|
|
|
if (item.errors === 0) {
|
|
assert.fail("Invalid cases must have 'error' value greater than 0");
|
|
}
|
|
|
|
assert.strictEqual(messages.length, item.errors, util.format("Should have %d error%s but had %d: %s",
|
|
item.errors,
|
|
item.errors === 1 ? "" : "s",
|
|
messages.length,
|
|
util.inspect(messages)));
|
|
} else {
|
|
assert.strictEqual(
|
|
messages.length, item.errors.length, util.format(
|
|
"Should have %d error%s but had %d: %s",
|
|
item.errors.length,
|
|
item.errors.length === 1 ? "" : "s",
|
|
messages.length,
|
|
util.inspect(messages)
|
|
)
|
|
);
|
|
|
|
const hasMessageOfThisRule = messages.some(m => m.ruleId === ruleId);
|
|
|
|
for (let i = 0, l = item.errors.length; i < l; i++) {
|
|
const error = item.errors[i];
|
|
const message = messages[i];
|
|
|
|
assert(hasMessageOfThisRule, "Error rule name should be the same as the name of the rule being tested");
|
|
|
|
if (typeof error === "string" || error instanceof RegExp) {
|
|
|
|
// Just an error message.
|
|
assertMessageMatches(message.message, error);
|
|
assert.ok(message.suggestions === void 0, `Error at index ${i} has suggestions. Please convert the test error into an object and specify 'suggestions' property on it to test suggestions.`);
|
|
} else if (typeof error === "object" && error !== null) {
|
|
|
|
/*
|
|
* Error object.
|
|
* This may have a message, messageId, data, node type, line, and/or
|
|
* column.
|
|
*/
|
|
|
|
Object.keys(error).forEach(propertyName => {
|
|
assert.ok(
|
|
errorObjectParameters.has(propertyName),
|
|
`Invalid error property name '${propertyName}'. Expected one of ${friendlyErrorObjectParameterList}.`
|
|
);
|
|
});
|
|
|
|
if (hasOwnProperty(error, "message")) {
|
|
assert.ok(!hasOwnProperty(error, "messageId"), "Error should not specify both 'message' and a 'messageId'.");
|
|
assert.ok(!hasOwnProperty(error, "data"), "Error should not specify both 'data' and 'message'.");
|
|
assertMessageMatches(message.message, error.message);
|
|
} else if (hasOwnProperty(error, "messageId")) {
|
|
assert.ok(
|
|
ruleHasMetaMessages,
|
|
"Error can not use 'messageId' if rule under test doesn't define 'meta.messages'."
|
|
);
|
|
if (!hasOwnProperty(rule.meta.messages, error.messageId)) {
|
|
assert(false, `Invalid messageId '${error.messageId}'. Expected one of ${friendlyIDList}.`);
|
|
}
|
|
assert.strictEqual(
|
|
message.messageId,
|
|
error.messageId,
|
|
`messageId '${message.messageId}' does not match expected messageId '${error.messageId}'.`
|
|
);
|
|
|
|
const unsubstitutedPlaceholders = getUnsubstitutedMessagePlaceholders(
|
|
message.message,
|
|
rule.meta.messages[message.messageId],
|
|
error.data
|
|
);
|
|
|
|
assert.ok(
|
|
unsubstitutedPlaceholders.length === 0,
|
|
`The reported message has ${unsubstitutedPlaceholders.length > 1 ? `unsubstituted placeholders: ${unsubstitutedPlaceholders.map(name => `'${name}'`).join(", ")}` : `an unsubstituted placeholder '${unsubstitutedPlaceholders[0]}'`}. Please provide the missing ${unsubstitutedPlaceholders.length > 1 ? "values" : "value"} via the 'data' property in the context.report() call.`
|
|
);
|
|
|
|
if (hasOwnProperty(error, "data")) {
|
|
|
|
/*
|
|
* if data was provided, then directly compare the returned message to a synthetic
|
|
* interpolated message using the same message ID and data provided in the test.
|
|
* See https://github.com/eslint/eslint/issues/9890 for context.
|
|
*/
|
|
const unformattedOriginalMessage = rule.meta.messages[error.messageId];
|
|
const rehydratedMessage = interpolate(unformattedOriginalMessage, error.data);
|
|
|
|
assert.strictEqual(
|
|
message.message,
|
|
rehydratedMessage,
|
|
`Hydrated message "${rehydratedMessage}" does not match "${message.message}"`
|
|
);
|
|
}
|
|
} else {
|
|
assert.fail("Test error must specify either a 'messageId' or 'message'.");
|
|
}
|
|
|
|
if (error.type) {
|
|
assert.strictEqual(message.nodeType, error.type, `Error type should be ${error.type}, found ${message.nodeType}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "line")) {
|
|
assert.strictEqual(message.line, error.line, `Error line should be ${error.line}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "column")) {
|
|
assert.strictEqual(message.column, error.column, `Error column should be ${error.column}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "endLine")) {
|
|
assert.strictEqual(message.endLine, error.endLine, `Error endLine should be ${error.endLine}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "endColumn")) {
|
|
assert.strictEqual(message.endColumn, error.endColumn, `Error endColumn should be ${error.endColumn}`);
|
|
}
|
|
|
|
assert.ok(!message.suggestions || hasOwnProperty(error, "suggestions"), `Error at index ${i} has suggestions. Please specify 'suggestions' property on the test error object.`);
|
|
if (hasOwnProperty(error, "suggestions")) {
|
|
|
|
// Support asserting there are no suggestions
|
|
const expectsSuggestions = Array.isArray(error.suggestions) ? error.suggestions.length > 0 : Boolean(error.suggestions);
|
|
const hasSuggestions = message.suggestions !== void 0;
|
|
|
|
if (!hasSuggestions && expectsSuggestions) {
|
|
assert.ok(!error.suggestions, `Error should have suggestions on error with message: "${message.message}"`);
|
|
} else if (hasSuggestions) {
|
|
assert.ok(expectsSuggestions, `Error should have no suggestions on error with message: "${message.message}"`);
|
|
if (typeof error.suggestions === "number") {
|
|
assert.strictEqual(message.suggestions.length, error.suggestions, `Error should have ${error.suggestions} suggestions. Instead found ${message.suggestions.length} suggestions`);
|
|
} else if (Array.isArray(error.suggestions)) {
|
|
assert.strictEqual(message.suggestions.length, error.suggestions.length, `Error should have ${error.suggestions.length} suggestions. Instead found ${message.suggestions.length} suggestions`);
|
|
|
|
error.suggestions.forEach((expectedSuggestion, index) => {
|
|
assert.ok(
|
|
typeof expectedSuggestion === "object" && expectedSuggestion !== null,
|
|
"Test suggestion in 'suggestions' array must be an object."
|
|
);
|
|
Object.keys(expectedSuggestion).forEach(propertyName => {
|
|
assert.ok(
|
|
suggestionObjectParameters.has(propertyName),
|
|
`Invalid suggestion property name '${propertyName}'. Expected one of ${friendlySuggestionObjectParameterList}.`
|
|
);
|
|
});
|
|
|
|
const actualSuggestion = message.suggestions[index];
|
|
const suggestionPrefix = `Error Suggestion at index ${index}:`;
|
|
|
|
if (hasOwnProperty(expectedSuggestion, "desc")) {
|
|
assert.ok(
|
|
!hasOwnProperty(expectedSuggestion, "data"),
|
|
`${suggestionPrefix} Test should not specify both 'desc' and 'data'.`
|
|
);
|
|
assert.ok(
|
|
!hasOwnProperty(expectedSuggestion, "messageId"),
|
|
`${suggestionPrefix} Test should not specify both 'desc' and 'messageId'.`
|
|
);
|
|
assert.strictEqual(
|
|
actualSuggestion.desc,
|
|
expectedSuggestion.desc,
|
|
`${suggestionPrefix} desc should be "${expectedSuggestion.desc}" but got "${actualSuggestion.desc}" instead.`
|
|
);
|
|
} else if (hasOwnProperty(expectedSuggestion, "messageId")) {
|
|
assert.ok(
|
|
ruleHasMetaMessages,
|
|
`${suggestionPrefix} Test can not use 'messageId' if rule under test doesn't define 'meta.messages'.`
|
|
);
|
|
assert.ok(
|
|
hasOwnProperty(rule.meta.messages, expectedSuggestion.messageId),
|
|
`${suggestionPrefix} Test has invalid messageId '${expectedSuggestion.messageId}', the rule under test allows only one of ${friendlyIDList}.`
|
|
);
|
|
assert.strictEqual(
|
|
actualSuggestion.messageId,
|
|
expectedSuggestion.messageId,
|
|
`${suggestionPrefix} messageId should be '${expectedSuggestion.messageId}' but got '${actualSuggestion.messageId}' instead.`
|
|
);
|
|
|
|
const unsubstitutedPlaceholders = getUnsubstitutedMessagePlaceholders(
|
|
actualSuggestion.desc,
|
|
rule.meta.messages[expectedSuggestion.messageId],
|
|
expectedSuggestion.data
|
|
);
|
|
|
|
assert.ok(
|
|
unsubstitutedPlaceholders.length === 0,
|
|
`The message of the suggestion has ${unsubstitutedPlaceholders.length > 1 ? `unsubstituted placeholders: ${unsubstitutedPlaceholders.map(name => `'${name}'`).join(", ")}` : `an unsubstituted placeholder '${unsubstitutedPlaceholders[0]}'`}. Please provide the missing ${unsubstitutedPlaceholders.length > 1 ? "values" : "value"} via the 'data' property for the suggestion in the context.report() call.`
|
|
);
|
|
|
|
if (hasOwnProperty(expectedSuggestion, "data")) {
|
|
const unformattedMetaMessage = rule.meta.messages[expectedSuggestion.messageId];
|
|
const rehydratedDesc = interpolate(unformattedMetaMessage, expectedSuggestion.data);
|
|
|
|
assert.strictEqual(
|
|
actualSuggestion.desc,
|
|
rehydratedDesc,
|
|
`${suggestionPrefix} Hydrated test desc "${rehydratedDesc}" does not match received desc "${actualSuggestion.desc}".`
|
|
);
|
|
}
|
|
} else if (hasOwnProperty(expectedSuggestion, "data")) {
|
|
assert.fail(
|
|
`${suggestionPrefix} Test must specify 'messageId' if 'data' is used.`
|
|
);
|
|
} else {
|
|
assert.fail(
|
|
`${suggestionPrefix} Test must specify either 'messageId' or 'desc'.`
|
|
);
|
|
}
|
|
|
|
assert.ok(hasOwnProperty(expectedSuggestion, "output"), `${suggestionPrefix} The "output" property is required.`);
|
|
const codeWithAppliedSuggestion = SourceCodeFixer.applyFixes(item.code, [actualSuggestion]).output;
|
|
|
|
// Verify if suggestion fix makes a syntax error or not.
|
|
const errorMessageInSuggestion =
|
|
linter.verify(codeWithAppliedSuggestion, result.configs, result.filename).find(m => m.fatal);
|
|
|
|
assert(!errorMessageInSuggestion, [
|
|
"A fatal parsing error occurred in suggestion fix.",
|
|
`Error: ${errorMessageInSuggestion && errorMessageInSuggestion.message}`,
|
|
"Suggestion output:",
|
|
codeWithAppliedSuggestion
|
|
].join("\n"));
|
|
|
|
assert.strictEqual(codeWithAppliedSuggestion, expectedSuggestion.output, `Expected the applied suggestion fix to match the test suggestion output for suggestion at index: ${index} on error with message: "${message.message}"`);
|
|
assert.notStrictEqual(expectedSuggestion.output, item.code, `The output of a suggestion should differ from the original source code for suggestion at index: ${index} on error with message: "${message.message}"`);
|
|
});
|
|
} else {
|
|
assert.fail("Test error object property 'suggestions' should be an array or a number");
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
|
|
// Message was an unexpected type
|
|
assert.fail(`Error should be a string, object, or RegExp, but found (${util.inspect(message)})`);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (hasOwnProperty(item, "output")) {
|
|
if (item.output === null) {
|
|
assert.strictEqual(
|
|
result.output,
|
|
item.code,
|
|
"Expected no autofixes to be suggested"
|
|
);
|
|
} else {
|
|
assert.strictEqual(result.output, item.output, "Output is incorrect.");
|
|
assert.notStrictEqual(item.code, item.output, "Test property 'output' matches 'code'. If no autofix is expected, then omit the 'output' property or set it to null.");
|
|
}
|
|
} else {
|
|
assert.strictEqual(
|
|
result.output,
|
|
item.code,
|
|
"The rule fixed the code. Please add 'output' property."
|
|
);
|
|
}
|
|
|
|
assertASTDidntChange(result.beforeAST, result.afterAST);
|
|
}
|
|
|
|
/*
|
|
* This creates a mocha test suite and pipes all supplied info through
|
|
* one of the templates above.
|
|
* The test suites for valid/invalid are created conditionally as
|
|
* test runners (eg. vitest) fail for empty test suites.
|
|
*/
|
|
this.constructor.describe(ruleName, () => {
|
|
if (test.valid.length > 0) {
|
|
this.constructor.describe("valid", () => {
|
|
test.valid.forEach(valid => {
|
|
this.constructor[valid.only ? "itOnly" : "it"](
|
|
sanitize(typeof valid === "object" ? valid.name || valid.code : valid),
|
|
() => {
|
|
try {
|
|
runHook(valid, "before");
|
|
testValidTemplate(valid);
|
|
} finally {
|
|
runHook(valid, "after");
|
|
}
|
|
}
|
|
);
|
|
});
|
|
});
|
|
}
|
|
|
|
if (test.invalid.length > 0) {
|
|
this.constructor.describe("invalid", () => {
|
|
test.invalid.forEach(invalid => {
|
|
this.constructor[invalid.only ? "itOnly" : "it"](
|
|
sanitize(invalid.name || invalid.code),
|
|
() => {
|
|
try {
|
|
runHook(invalid, "before");
|
|
testInvalidTemplate(invalid);
|
|
} finally {
|
|
runHook(invalid, "after");
|
|
}
|
|
}
|
|
);
|
|
});
|
|
});
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
RuleTester[DESCRIBE] = RuleTester[IT] = RuleTester[IT_ONLY] = null;
|
|
|
|
module.exports = RuleTester;
|