Migrate unit tests to jest (#162)

* Migrate test framework to Jest

* Format source files with prettify

* Bump CI node version to 20.x

---------

Co-authored-by: Silvia Chen <[email protected]>

.eslintrc.js

@@ -1,3 +1,7 @@
+/*!
+ * Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT
+ */
 
 module.exports = {
 	extends: [
@@ -6,14 +10,25 @@ module.exports = {
 	  'plugin:@typescript-eslint/recommended',
 	],
 	plugins: ['@typescript-eslint'],
-   
+
 	rules: {
-	  "@typescript-eslint/return-await": 'off',
-	  "@typescript-eslint/no-inferrable-types": 'warn',
-	  "@typescript-eslint/no-explicit-any": 'warn',
+	  '@typescript-eslint/no-explicit-any': 'off',
 	  'no-console': 'warn',
-	  'prefer-const': 'warn',
-	  'no-useless-escape': 'warn'
+	  '@typescript-eslint/no-unused-vars': [
+		'warn',
+		{
+		  caughtErrors: 'none',
+		  argsIgnorePattern: '^_',
+		},
+	  ],
+	  '@typescript-eslint/no-unused-expressions': [
+		'error',
+		{
+		  allowShortCircuit: true,
+		  allowTernary: true,
+		},
+	  ],
 	},
-	ignorePatterns: ['*.js', '*.d.ts', 'node_modules/'],
-}
+	ignorePatterns: ['*.js', '*.d.ts', 'node_modules/', 'src/tests/yaml-strings', 'src/tests/json-strings'],
+  }
+

.github/workflows/compile-lint-test.yml

@@ -2,18 +2,20 @@ name: compile-lint-test
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [16.x]
+        # To avoid compatibility problems, pin the CI node.js version to node version used by VSCode Electron
+        # so integration testing will not rely on a later version of node than exists in the default VS Code execution env.
+        # Full table with details here: https://github.com/ewanharris/vscode-versions
+        node-version: [20.x]
 
     steps:
       - uses: actions/checkout@v3

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 node_modules
 out
+coverage

.husky/pre-commit

@@ -0,0 +1 @@
+lint-staged

.lintstagedrc

@@ -0,0 +1,4 @@
+{
+  "*.{js,yml,json,md}": "prettier --write",
+  "*.ts": ["eslint --fix", "prettier --write"]
+}

.prettierrc.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "http://json.schemastore.org/prettierrc",
+  "tabWidth": 2,
+  "trailingComma": "all",
+  "semi": false,
+  "useTabs": false,
+  "singleQuote": true,
+  "printWidth": 120
+}

babel.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  presets: [['@babel/preset-env', { targets: { node: 'current' } }]],
+}

jest.config.ts

@@ -0,0 +1,29 @@
+/*!
+ * Copyright 2025 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: MIT
+ */
+
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+
+const transformCodeInPackages = []
+
+module.exports = {
+  preset: 'ts-jest',
+  testMatch: ['**/src/**/?(*.)+(spec|test).ts'],
+
+  coverageReporters: ['cobertura', 'html', 'text'],
+  collectCoverageFrom: ['src/**/*.ts'],
+  coveragePathIgnorePatterns: ['^.*/scripts/.*$', '^.*/schema/.*$', '^.*/tests/.*$', 'interface.ts'],
+  transformIgnorePatterns: [`<rootDir>/node_modules/(?!${transformCodeInPackages.join('|')}).+\\.js$`],
+  transform: {
+    '^.+\\.(ts|tsx)?$': 'ts-jest',
+    '^.+\\.(js|jsx)$': [
+      'babel-jest',
+      {
+        presets: ['@babel/preset-env'],
+        plugins: [['@babel/transform-runtime']],
+      },
+    ],
+  },
+  clearMocks: true,
+}