test: migrate from mocha to jest

Update package.json devDependencies:

```diff
+jest
-mocha
-nyc
```

Update package.json scripts and remove `test:coverage:report`

Run `jest-codemods` (https://jestjs.io/docs/en/migration-guide):

```sh
jscodeshift -t jest-codemods/dist/transformers/mocha.js . --ignore-pattern node_modules --parser babel
```

Rename files under `test` directory

Update eslint, husky, travis, and tsconfig

Author: remarkablemark

Diff for: .eslintrc.json

@@ -2,7 +2,7 @@
   "env": {
     "browser": true,
     "commonjs": true,
-    "mocha": true,
+    "jest": true,
     "node": true
   },
   "extends": "eslint:recommended",

Diff for: .huskyrc.json

@@ -1,6 +1,6 @@
 {
   "hooks": {
     "commit-msg": "commitlint -E HUSKY_GIT_PARAMS",
-    "pre-commit": "npm run lint:dts && npm run test:coverage && lint-staged"
+    "pre-commit": "npm run lint:dts && npm test && lint-staged"
   }
 }

Diff for: .travis.yml

@@ -8,11 +8,11 @@ script:
   - npx commitlint --from=HEAD~1
   - npm run lint
   - npm run lint:dts
-  - npm run test:coverage
+  - npm test
   - npm run build
   - npm run benchmark
 after_success:
-  - npx nyc report --reporter=text-lcov | npx coveralls
+  - cat coverage/lcov.info | npx coveralls
 cache:
   directories:
     - node_modules

Diff for: package.json

@@ -13,9 +13,8 @@
     "lint:fix": "npm run lint -- --fix",
     "prepublishOnly": "npm run lint && npm run lint:dts && npm test && npm run clean && npm run build",
     "release": "standard-version --no-verify",
-    "test": "mocha",
-    "test:coverage": "nyc npm test",
-    "test:coverage:report": "nyc report --reporter=html"
+    "test": "jest --coverage",
+    "test:watch": "npm test -- --watch"
   },
   "repository": {
     "type": "git",
@@ -49,9 +48,8 @@
     "eslint": "^7.1.0",
     "eslint-plugin-prettier": "^3.1.3",
     "husky": "^4.2.5",
+    "jest": "^26.0.1",
     "lint-staged": "^10.2.7",
-    "mocha": "^7.2.0",
-    "nyc": "^15.1.0",
     "preact": "^10.4.4",
     "prettier": "^2.0.5",
     "react": "^16",

Diff for: test/attributes-to-props.js renamed to test/attributes-to-props.test.js

@@ -259,11 +259,11 @@ describe('attributes to props', () => {
     describe('when utilties.PRESERVE_CUSTOM_ATTRIBUTES=false', () => {
       const { PRESERVE_CUSTOM_ATTRIBUTES } = utilities;
 
-      before(() => {
+      beforeAll(() => {
         utilities.PRESERVE_CUSTOM_ATTRIBUTES = false;
       });
 
-      after(() => {
+      afterAll(() => {
         utilities.PRESERVE_CUSTOM_ATTRIBUTES = PRESERVE_CUSTOM_ATTRIBUTES;
       });
 

Diff for: test/dom-to-react.js renamed to test/dom-to-react.test.js

@@ -210,11 +210,11 @@ describe('DOM to React', () => {
   describe('when React <16', () => {
     const { PRESERVE_CUSTOM_ATTRIBUTES } = utilities;
 
-    before(() => {
+    beforeAll(() => {
       utilities.PRESERVE_CUSTOM_ATTRIBUTES = false;
     });
 
-    after(() => {
+    afterAll(() => {
       utilities.PRESERVE_CUSTOM_ATTRIBUTES = PRESERVE_CUSTOM_ATTRIBUTES;
     });
 

Diff for: test/html-to-react.js renamed to test/html-to-react.test.js

@@ -19,7 +19,7 @@
   "files": [
     "index.d.ts",
     "lib/dom-to-react.d.ts",
-    "test/types/index.test.tsx",
-    "test/types/lib/dom-to-react.test.tsx"
+    "test/types/index.tsx",
+    "test/types/lib/dom-to-react.tsx"
   ]
 }