Add jest (#62)

timdeschryver · Zubair Ahmed · commit f442219e1b1c · 2017-11-03T00:42:47.000+05:30
* add jest

* add env preset for test

* run jest with --findRelatedTests
diff --git a/.babelrc b/.babelrc
@@ -1,5 +1,18 @@
 {
-  "presets": ["next/babel"],
+  "env": {
+    "development": {
+      "presets": "next/babel"
+    },
+    "production": {
+      "presets": "next/babel"
+    },
+    "test": {
+      "presets": [
+        ["env", { "modules": "commonjs" }],
+        "next/babel"
+      ]
+    }
+  },
   "plugins": [
     [
       "lodash",
diff --git a/__tests__/index.test.js b/__tests__/index.test.js
@@ -0,0 +1,5 @@
+describe('Setting up jest', () => {
+  it('Runs tests', () => {
+    expect('foo').toEqual('foo');
+  });
+});
diff --git a/package.json b/package.json
@@ -4,9 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "xo",
-    "lint":
-      "prettier 'utils/**/*.js' 'components/**/*.js' 'pages/**/*.js' 'lib/**/*.js' 'hocs/**/*.js' '*.js' --write --single-quote --print-width='80' --trailing-comma='all' && xo --fix",
+    "test": "xo && jest",
+    "lint": "prettier 'utils/**/*.js' 'components/**/*.js' 'pages/**/*.js' 'lib/**/*.js' 'hocs/**/*.js' '*.js' --write --single-quote --print-width='80' --trailing-comma='all' && xo --fix",
     "precommit": "lint-staged",
     "analyze": "cross-env ANALYZE=1 next build",
     "dev": "cross-env NODE_ENV=development node server.js",
@@ -16,20 +15,40 @@
   },
   "xo": {
     "parser": "babel-eslint",
-    "extends": ["prettier", "prettier/react", "plugin:react/recommended"],
-    "env": ["browser", "node"],
+    "extends": [
+      "prettier",
+      "prettier/react",
+      "plugin:react/recommended"
+    ],
+    "env": [
+      "browser",
+      "node"
+    ],
     "rules": {
       "linebreak-style": 0,
       "react/display-name": 0,
       "react/prop-types": 0
     },
     "space:": 2,
-    "ignores": ["next.config.js"]
+    "ignores": [
+      "next.config.js"
+    ],
+    "overrides": [
+      {
+        "files": "**/__tests__/*.test.js",
+        "globals": [
+          "describe",
+          "it",
+          "expect"
+        ]
+      }
+    ]
   },
   "lint-staged": {
     "*.js": [
       "prettier --write --single-quote --print-width=80 --trailing-comma=all",
       "xo",
+      "jest --findRelatedTests",
       "git add"
     ]
   },
@@ -68,6 +87,7 @@
     "eslint-config-prettier": "^2.3.0",
     "eslint-plugin-react": "^7.1.0",
     "husky": "^0.14.3",
+    "jest": "^21.2.1",
     "lint-staged": "^4.0.2",
     "normalize-url": "1.9.1",
     "now": "8.3.10",
