Replace mocha by jest

jest.config.js

@@ -0,0 +1,12 @@
+'use strict';
+
+module.exports = {
+  clearMocks: true,
+  coverageDirectory: 'reports/coverage',
+  testEnvironment: 'node',
+  testMatch: [
+    '**/tests/lib/**/*.[jt]s?(x)',
+    '**/tests/util/**/*.[jt]s?(x)',
+    '**/tests/index.[jt]s?(x)'
+  ]
+};

package.json

@@ -9,7 +9,8 @@
     "lint": "eslint ./",
     "pretest": "npm run lint",
     "test": "npm run unit-test",
-    "unit-test": "istanbul cover --dir reports/coverage node_modules/mocha/bin/_mocha tests/lib/**/*.js tests/util/**/*.js tests/index.js"
+    "test:watch": "jest --watch",
+    "unit-test": "jest --coverage"
   },
   "files": [
     "LICENSE",
@@ -37,9 +38,7 @@
     "babel-eslint": "^10.0.1",
     "coveralls": "^3.0.2",
     "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0",
-    "istanbul": "^0.4.5",
-    "mocha": "^6.1.4",
-    "sinon": "^7.2.2",
+    "jest": "^24.7.1",
     "typescript": "^3.2.2"
   },
   "peerDependencies": {

tests/index.js

@@ -1,4 +1,4 @@
-/* eslint-env mocha */
+/* eslint-env jest */
 'use strict';
 
 const plugin = require('..');

tests/util/.eslintrc

@@ -1,5 +1,5 @@
 {
   "env": {
-     "mocha": true
+     "jest": true
   }
 }

tests/util/version.js

@@ -2,26 +2,26 @@
 
 const path = require('path');
 const assert = require('assert');
-const sinon = require('sinon');
 const versionUtil = require('../../lib/util/version');
 
 describe('Version', () => {
   const base = path.resolve(__dirname, '..', 'fixtures', 'version');
   let cwd;
   let expectedErrorArgs = [];
+  let spy;
 
   beforeEach(() => {
     cwd = process.cwd();
     process.chdir(base);
-    sinon.stub(console, 'error');
+    spy = jest.spyOn(console, 'error').mockImplementation(() => {});
     expectedErrorArgs = [];
   });
 
   afterEach(() => {
     process.chdir(cwd);
 
-    const actualArgs = console.error.args; // eslint-disable-line no-console
-    console.error.restore(); // eslint-disable-line no-console
+    const actualArgs = console.error.mock.calls; // eslint-disable-line no-console
+    spy.mockRestore();
     assert.deepEqual(actualArgs, expectedErrorArgs);
   });