refactor: use Jest for tests and linting (#113)

Author: macklinu

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 .idea
+coverage/

.npmignore

@@ -1,6 +1,8 @@
 node_modules
 .idea
-test
+__tests__
 .npmignore
 .travis.yml
 .eslintrc.json
+docs
+coverage

.travis.yml

@@ -1,8 +1,10 @@
 language: node_js
+cache:
+  directories:
+    - "node_modules"
 node_js:
   - 4
   - 6
   - 8
 script:
-  - npm run test
-  - npm run lint
+  - npm run test -- --runInBand

CONTRIBUTING.md

@@ -73,12 +73,15 @@ After
 [cloning the repository](https://help.github.com/articles/cloning-a-repository/),
 run `npm install` to install dependencies.
 
-Run `npm test` to run the test suite. Sometimes it can be helpful to run a
+Run `npm test` to run the test suite (powered by
+[Jest](https://facebook.github.io/jest/)). Sometimes it can be helpful to run a
 single test file and watch for changes, especially when working on a single
-rule. You can run `npx mocha path/to/test.js --watch` to achieve this.
+rule. You can run `npm test -- --watch` to achieve this.
 
 Run `npm run lint` to lint the codebase. If there are any errors reported, try
 running `npm run lint -- --fix` first to see if ESLint can fix them for you.
+`npm test` will also lint the codebase thanks to
+[jest-runner-eslint](https://github.com/jest-community/jest-runner-eslint).
 
 This codebase uses [Prettier](http://prettier.io/) for code formatting. Consider
 installing an [editor plugin](https://prettier.io/docs/en/editors.html) for the

__tests__/.eslintrc.json

@@ -0,0 +1,7 @@
+{
+  "plugins": ["jest"],
+  "extends": ["plugin:jest/recommended"],
+  "env": {
+    "jest/globals": true
+  }
+}

test/always-return.test.js renamed to __tests__/always-return.js

@@ -0,0 +1,5 @@
+'use strict'
+
+test('can require index file', () => {
+  expect(require('../index')).toBeInstanceOf(Object)
+})

test/avoid-new.js renamed to __tests__/avoid-new.js

@@ -13,8 +13,8 @@
   "repository": "[email protected]:xjamundx/eslint-plugin-promise.git",
   "scripts": {
     "precommit": "lint-staged",
-    "test": "mocha test",
-    "lint": "eslint index.js rules test --ignore-pattern '**/*.json'"
+    "test": "jest",
+    "lint": "eslint index.js rules __tests__ --ignore-pattern '**/*.json'"
   },
   "devDependencies": {
     "doctoc": "^1.3.0",
@@ -23,13 +23,15 @@
     "eslint-config-standard": "^11.0.0-beta.0",
     "eslint-plugin-eslint-plugin": "^1.4.0",
     "eslint-plugin-import": "^2.8.0",
+    "eslint-plugin-jest": "^21.12.2",
     "eslint-plugin-node": "^6.0.0",
     "eslint-plugin-prettier": "^2.6.0",
     "eslint-plugin-promise": "./",
     "eslint-plugin-standard": "^3.0.1",
     "husky": "^0.14.3",
+    "jest": "^22.4.2",
+    "jest-runner-eslint": "^0.4.0",
     "lint-staged": "^6.1.0",
-    "mocha": "^5.0.0",
     "prettier": "^1.10.2"
   },
   "engines": {
@@ -51,5 +53,22 @@
     "semi": false,
     "singleQuote": true,
     "proseWrap": "always"
+  },
+  "jest": {
+    "projects": [
+      {
+        "displayName": "test",
+        "testEnvironment": "node"
+      },
+      {
+        "runner": "jest-runner-eslint",
+        "displayName": "lint",
+        "testMatch": [
+          "<rootDir>/rules/**/*.js",
+          "<rootDir>/__tests__/**/*.js",
+          "<rootDir>/index.js"
+        ]
+      }
+    ]
   }
 }