Replace mocha with jest

jest.config.js

@@ -0,0 +1,20 @@
+// Jest configuration
+// Reference: https://jestjs.io/docs/configuration
+
+module.exports = {
+  testMatch: [
+    '**/test/*.js'
+  ],
+  testPathIgnorePatterns: [
+    '<rootDir>/test/helpers.js'
+  ],
+  setupFilesAfterEnv: [
+    '<rootDir>/test/helpers.js'
+  ],
+  watchPathIgnorePatterns: [
+    // Ignore the output generated by plugin tests
+    // when watching for changes to avoid the test
+    // runner continuously re-running tests
+    '<rootDir>/test/output'
+  ]
+}