Initial import with skill sheet working

node_modules/abstract-level/test/open-error-if-exists-test.js

@@ -0,0 +1,29 @@
+'use strict'
+
+exports.errorIfExists = function (test, testCommon) {
+  test('test database open errorIfExists:true', function (t) {
+    const db = testCommon.factory()
+
+    db.open(function (err) {
+      t.error(err)
+      db.close(function (err) {
+        t.error(err)
+
+        let async = false
+
+        db.open({ createIfMissing: false, errorIfExists: true }, function (err) {
+          t.is(err && err.code, 'LEVEL_DATABASE_NOT_OPEN')
+          t.ok(err && /exists/.test(err.cause && err.cause.message), 'error is about already existing')
+          t.ok(async, 'callback is asynchronous')
+          t.end()
+        })
+
+        async = true
+      })
+    })
+  })
+}
+
+exports.all = function (test, testCommon) {
+  exports.errorIfExists(test, testCommon)
+}