Initial import with skill sheet working

node_modules/abstract-level/test/factory-test.js

@@ -0,0 +1,52 @@
+'use strict'
+
+module.exports = function (test, testCommon) {
+  test('testCommon.factory() returns valid database', function (t) {
+    t.plan(6)
+
+    const db = testCommon.factory()
+    const kEvent = Symbol('event')
+
+    // Avoid instanceof, for levelup compatibility tests
+    t.is(typeof db, 'object', 'is an object')
+    t.isNot(db, null, 'is not null')
+    t.is(typeof db.open, 'function', 'has open() method')
+    t.is(typeof db.on, 'function', 'has on() method')
+    t.is(typeof db.emit, 'function', 'has emit() method')
+
+    db.once(kEvent, (v) => t.is(v, 'foo', 'got event'))
+    db.emit(kEvent, 'foo')
+  })
+
+  test('testCommon.factory() returns a unique database', function (t) {
+    const db1 = testCommon.factory()
+    const db2 = testCommon.factory()
+
+    t.isNot(db1, db2, 'unique instances')
+
+    function close () {
+      db1.close(function (err) {
+        t.error(err, 'no error while closing db1')
+        db2.close(function (err) {
+          t.error(err, 'no error while closing db2')
+          t.end()
+        })
+      })
+    }
+
+    db1.open(function (err) {
+      t.error(err, 'no error while opening db1')
+      db2.open(function (err) {
+        t.error(err, 'no error while opening db2')
+        db1.put('key', 'value', function (err) {
+          t.error(err, 'put key in db1')
+          db2.get('key', function (err, value) {
+            t.ok(err, 'db2 should be empty')
+            t.is(value, undefined, 'db2 should be empty')
+            close()
+          })
+        })
+      })
+    })
+  })
+}