Add Jest testing

.eslintrc.js

@@ -14,9 +14,7 @@ module.exports = {
   overrides: [
     {
       files: ["**/__tests__/*.{j,t}s?(x)"],
-      env: {
-        mocha: true,
-      },
+      env: { jest: true },
     },
   ],
 };

.gitignore

@@ -20,5 +20,8 @@ yarn-error.log*
 *.sln
 *.sw?
 
-#Electron-builder output
-/dist_electron
+# Electron-builder output
+/dist_electron
+
+# Coverage
+/coverage

jest.config.js

@@ -0,0 +1,27 @@
+module.exports = {
+  collectCoverageFrom: ["src/**/*.(js|vue)"],
+  coverageDirectory: "./coverage",
+  coverageReporters: ["lcov", "text-summary"],
+  moduleFileExtensions: ["js", "jsx", "json", "vue"],
+  transform: {
+    "^.+\\.vue$": "vue-jest",
+    ".+\\.(css|styl|less|sass|scss|svg|png|jpg|ttf|woff|woff2)$":
+      "jest-transform-stub",
+    "^.+\\.jsx?$": "babel-jest",
+  },
+  transformIgnorePatterns: ["/node_modules/"],
+  moduleNameMapper: {
+    "^@/(.*)$": "<rootDir>/src/$1",
+  },
+  // Named 'setupFilesAfterEnv' in Jest 24+
+  setupTestFrameworkScriptFile: "./tests/setup/expect.js",
+  snapshotSerializers: ["jest-serializer-vue"],
+  testMatch: [
+    "**/tests/unit/**/*.spec.(js|jsx|ts|tsx)|**/__tests__/*.(js|jsx|ts|tsx)",
+  ],
+  testURL: "http://localhost/",
+  watchPlugins: [
+    "jest-watch-typeahead/filename",
+    "jest-watch-typeahead/testname",
+  ],
+};