feat(app): add jest testing #2

.eslintrc

@@ -1,5 +1,8 @@
 {
   "extends": "ksv741",
+  "env": {
+    "jest": true
+  },
   "rules": {
     "import/extensions": [
       "error", "ignorePackages", {

README.md

@@ -7,3 +7,4 @@
 - `build:prod` - build application
 - `analyze:prod` - start analyze server on [`http://127.0.0.1:8888`](http://127.0.0.1:8888)
 - `lint` - linting files via ESLint
+- `test` - run test via Jest

configs/jest/babel-jest.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  presets: [
+    '@babel/preset-env',
+    ['@babel/preset-react', {
+      runtime: 'automatic',
+    }],
+  ],
+};

configs/jest/jest.config.js

@@ -0,0 +1,12 @@
+const path = require('path');
+
+module.exports = {
+  testEnvironment: 'jsdom',
+  rootDir: '../../',
+  transform: {
+    '\\.jsx?$': ['babel-jest', {
+      configFile: path.resolve(__dirname, 'babel-jest.config.js'),
+    }],
+  },
+  setupFilesAfterEnv: [path.resolve(__dirname, 'setupTests.js')],
+};

configs/jest/setupTests.js

@@ -0,0 +1 @@
+import '@testing-library/jest-dom';

jest.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  testEnvironment: 'jsdom',
+  transform: {
+    '\\.jsx?$': ['babel-jest', {
+      configFile: './configs/jest/babel-jest.config.js',
+    }],
+  },
+  setupFilesAfterEnv: ['./configs/jest/setupTests.js'],
+};