Merge pull request #18 from CodinGame/add-tests

Add tests

Author: MaximeCheramy

.eslintrc.js

@@ -1,7 +1,8 @@
 module.exports = {
   env: {
     browser: true,
-    es6: true
+    es6: true,
+    jest: true
   },
   extends: [
     'standard'

babel.test.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  plugins: [
+    ["@babel/plugin-transform-modules-commonjs", {
+      importInterop: 'babel'
+    }]
+  ],
+  presets: [
+    "@babel/preset-env",
+    "@babel/preset-typescript"
+  ]
+};

browserMock.js

@@ -0,0 +1,52 @@
+const fs = require('fs/promises')
+
+Object.defineProperty(document, 'queryCommandSupported', {
+  value: jest.fn().mockImplementation(() => true),
+});
+
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: jest.fn().mockImplementation(query => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: jest.fn(), // Deprecated
+    removeListener: jest.fn(), // Deprecated
+    addEventListener: jest.fn(),
+    removeEventListener: jest.fn(),
+    dispatchEvent: jest.fn(),
+  })),
+});
+
+Object.defineProperty(window, 'fetch', {
+  value: jest.fn(async (path) => {
+
+    const content = await fs.readFile(path)
+    return {
+      json: async () => JSON.stringify(JSON.parse(content.toString())),
+      arrayBuffer: async () => content.buffer.slice(content.byteOffset, content.byteOffset + content.byteLength)
+    }
+  })
+})
+
+Object.defineProperty(URL, 'createObjectURL', {
+  value: jest.fn((blob) => {
+
+    return null
+  })
+})
+
+Object.defineProperty(window, 'Worker', {
+  value: class Worker {
+    constructor(stringUrl) {}
+    postMessage(msg) {}
+    terminate () {}
+  }
+})
+
+Object.defineProperty(window, 'ResizeObserver', {
+  value: class ResizeObserver {
+    constructor(stringUrl) {}
+    observe() {}
+  }
+})

jest/cssTransform.js

@@ -0,0 +1,14 @@
+'use strict';
+
+// This is a custom Jest transformer turning style imports into empty objects.
+// http://facebook.github.io/jest/docs/en/webpack.html
+
+module.exports = {
+  process() {
+    return 'module.exports = {};';
+  },
+  getCacheKey() {
+    // The output is always the same.
+    return 'cssTransform';
+  },
+};

jest/fileTransform.js

@@ -0,0 +1,7 @@
+module.exports = {
+  process(src, filename) {
+    const assetFilename = JSON.stringify(filename);
+
+    return `module.exports = ${assetFilename};`;
+  },
+};