migrate tests to jest (#60)

Author: adonesky1

.eslintrc.js

@@ -6,7 +6,7 @@ module.exports = {
   overrides: [
     {
       files: ['test/**/*.js'],
-      extends: ['@metamask/eslint-config-mocha'],
+      extends: ['@metamask/eslint-config-jest'],
     },
   ],
 

.gitignore

@@ -3,3 +3,6 @@ package-lock.json
 
 # Optional eslint cache
 .eslintcache
+
+# Jest
+/coverage

jest.config.js

@@ -0,0 +1,23 @@
+module.exports = {
+  collectCoverage: true,
+  coverageReporters: ['text', 'html'],
+  coverageThreshold: {
+    global: {
+      branches: 84,
+      functions: 100,
+      lines: 96,
+      statements: 96,
+    },
+  },
+  moduleFileExtensions: ['js', 'json', 'jsx', 'ts', 'tsx', 'node'],
+  // "resetMocks" resets all mocks, including mocked modules, to jest.fn(),
+  // between each test case.
+  resetMocks: true,
+  // "restoreMocks" restores all mocks created using jest.spyOn to their
+  // original implementations, between each test. It does not affect mocked
+  // modules.
+  restoreMocks: true,
+  testEnvironment: 'node',
+  testMatch: ['**/test/**/*.js'],
+  testTimeout: 2500,
+};

package.json

@@ -23,7 +23,7 @@
     "lint:misc": "prettier '**/*.json' '**/*.md' '!CHANGELOG.md' '**/*.yml' --ignore-path .gitignore",
     "lint": "yarn lint:eslint && yarn lint:misc --check",
     "lint:fix": "yarn lint:eslint --fix && yarn lint:misc --write",
-    "test": "mocha"
+    "test": "jest"
   },
   "dependencies": {
     "@metamask/bip39": "^4.0.0",
@@ -36,15 +36,16 @@
     "@lavamoat/allow-scripts": "^1.0.6",
     "@metamask/auto-changelog": "^2.5.0",
     "@metamask/eslint-config": "^8.0.0",
-    "@metamask/eslint-config-mocha": "^8.0.0",
+    "@metamask/eslint-config-jest": "^9.0.0",
     "@metamask/eslint-config-nodejs": "^8.0.0",
+    "@types/jest": "^27.4.1",
     "eslint": "^7.32.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-import": "^2.24.2",
-    "eslint-plugin-mocha": "^8.1.0",
+    "eslint-plugin-jest": "^24.3.6",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.3.1",
-    "mocha": "^8.1.3",
+    "jest": "^27.5.1",
     "prettier": "^2.4.1",
     "prettier-plugin-packagejson": "^2.2.12"
   },