feat(package.json): configure jest

Author: olegafx

.eslintrc

@@ -2,6 +2,7 @@
   "env": {
     "browser": true,
     "es6": true,
+    "jest": true,
     "node": true
   },
 

babel.config.js

@@ -1,5 +1,5 @@
 module.exports = function(api) {
-  api.cache.using(() => process.env.NODE_ENV);
+  const isTest = String(api.env()) === "test";
 
   const plugins = [
     "react-hot-loader/babel",
@@ -26,15 +26,18 @@ module.exports = function(api) {
     "@babel/plugin-syntax-dynamic-import",
     "@babel/plugin-syntax-import-meta",
     ["@babel/plugin-proposal-class-properties", { loose: false }],
-    "@babel/plugin-proposal-json-strings"
-  ];
+    "@babel/plugin-proposal-json-strings",
+
+    // jest
+    isTest ? "babel-plugin-dynamic-import-node" : null
+  ].filter(Boolean);
 
   const presets = [
     [
       "@babel/preset-env",
       {
-        debug: true,
-        modules: false,
+        debug: false,
+        modules: isTest ? "commonjs" : false,
         useBuiltIns: "usage"
       }
     ],

jest.config.js

@@ -0,0 +1,21 @@
+module.exports = {
+  collectCoverageFrom: ["**/src/**/*.js"],
+  coverageThreshold: {
+    global: {
+      statements: 10,
+      branches: 10,
+      functions: 10,
+      lines: 10
+    }
+  },
+  displayName: "client",
+  moduleNameMapper: {
+    "\\.css": "identity-obj-proxy",
+    "\\.svg$": "<rootDir>/test/svg-file-mock.js"
+  },
+  modulePaths: ["<rootDir>/src", "<rootDir>/test"],
+  setupTestFrameworkScriptFile: require.resolve(
+    "./test/setup-test-framework.js"
+  ),
+  testPathIgnorePatterns: ["/node_modules/"]
+};