set up unit tests and test coverage

.gitignore

@@ -5,3 +5,4 @@ node_modules
 *.vsix
 .eslintcache
 .idea
+coverage

.vscode/launch.json

@@ -18,17 +18,17 @@
 			"preLaunchTask": "${defaultBuildTask}"
 		},
 		{
-			"name": "Extension Tests",
-			"type": "extensionHost",
+			"name": "Jest unit tests",
+			"type": "node",
 			"request": "launch",
+			"program": "${workspaceRoot}/node_modules/jest/bin/jest.js",
 			"args": [
-				"--extensionDevelopmentPath=${workspaceFolder}",
-				"--extensionTestsPath=${workspaceFolder}/out/test/suite/index"
-			],
-			"outFiles": [
-				"${workspaceFolder}/out/test/**/*.js"
+				"--verbose",
+				"-i",
+				"--no-cache"
 			],
-			"preLaunchTask": "${defaultBuildTask}"
+			"console": "integratedTerminal",
+			"internalConsoleOptions": "neverOpen"
 		}
 	]
-}
+}

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  presets: [
+    ["@babel/preset-env", { targets: { node: "current" } }],
+    "@babel/preset-typescript",
+  ],
+};

jest.config.js

@@ -0,0 +1,200 @@
+/*
+ * For a detailed explanation regarding each configuration property and type check, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+module.exports = {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "/private/var/folders/zz/mk0xtnfj4sq2nssf55xmbbr00000gn/T/jest_dx",
+
+  // Automatically clear mock calls, instances, contexts and results before every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  collectCoverage: true,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  collectCoverageFrom: ["src/**/*"],
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: "coverage",
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // Indicates which provider should be used to instrument code for coverage
+  coverageProvider: "v8",
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  coverageReporters: [
+    "html",
+    // "json",
+    // "text",
+    "lcov",
+    // "clover"
+  ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: undefined,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: undefined,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // The default configuration for fake timers
+  // fakeTimers: {
+  //   "enableGlobally": false
+  // },
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: undefined,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: undefined,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+  // maxWorkers: "50%",
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  // moduleFileExtensions: [
+  //   "js",
+  //   "mjs",
+  //   "cjs",
+  //   "jsx",
+  //   "ts",
+  //   "tsx",
+  //   "json",
+  //   "node"
+  // ],
+
+  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: undefined,
+
+  // Run tests from one or more projects
+  // projects: undefined,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state before every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: undefined,
+
+  // Automatically restore mock state and implementation before every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: undefined,
+
+  // A list of paths to directories that Jest should use to search for files in
+  // roots: [
+  //   "<rootDir>"
+  // ],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // The number of seconds after which a test is considered as slow and reported as such in the results.
+  // slowTestThreshold: 5,
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  // testEnvironment: "jest-environment-node",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  testPathIgnorePatterns: ["/node_modules/", "./src/test/*", "./out/*"],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: ["./src/**/*.ts"],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: undefined,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jest-circus/runner",
+
+  // A map from regular expressions to paths to transformers
+  // transform: undefined,
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "/node_modules/",
+  //   "\\.pnp\\.[^\\/]+$"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: undefined,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+
+  globals: {
+    "ts-jest": {
+      tsConfig: "tsconfig-test.json",
+    },
+  },
+};

package.json

@@ -35,27 +35,33 @@
     "build": "yarn run compile",
     "compile": "tsc -p ./",
     "watch": "tsc -watch -p ./",
-    "pretest": "yarn run compile && yarn run lint",
     "lint": "eslint src --ext ts --fix --cache --cache-strategy content",
     "lint:ci": "yarn lint -- --max-warnings 0",
-    "test": "node ./out/test/runTest.js"
+    "coverage": "open coverage/index.html",
+    "test": "jest --config jest.config.js"
   },
   "devDependencies": {
+    "@babel/core": "^7.19.3",
+    "@babel/preset-env": "^7.19.3",
+    "@babel/preset-typescript": "^7.18.6",
     "@types/glob": "^8.0.0",
-    "@types/mocha": "^10.0.0",
+    "@types/jest": "^29.1.2",
     "@types/node": "16.x",
     "@types/vscode": "^1.71.0",
     "@typescript-eslint/eslint-plugin": "^5.39.0",
     "@typescript-eslint/parser": "^5.39.0",
     "@vscode/test-electron": "^2.1.5",
+    "babel-jest": "^29.1.2",
     "eslint": "^8.24.0",
     "eslint-config-prettier": "^8.5.0",
     "eslint-import-resolver-typescript": "^3.5.1",
     "eslint-plugin-import": "^2.26.0",
     "eslint-plugin-prettier": "^4.2.1",
     "glob": "^8.0.3",
-    "mocha": "^10.0.0",
+    "jest": "^29.1.2",
     "prettier": "^2.7.1",
+    "ts-jest": "^29.0.3",
+    "ts-node": "^10.9.1",
     "typescript": "^4.8.4"
   },
   "dependencies": {

src/extension.ts

@@ -1,6 +1,6 @@
 import * as vscode from "vscode";
 import { ExtensionInitialization } from "./services/ExtensionInitialization";
-import { validateConfig } from "./utils/growthbook-utils";
+import { validateConfig } from "./utils/growthbook-utils/growthbook-utils";
 import {
   doesPathExist,
   getGrowthBookConfig,