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feat(rules): add require-top-level-describe rule (#407)
Closes #401
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‎README.md‎

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@@ -104,46 +104,47 @@ installations requiring long-term consistency.
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## Rules
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| Rule | Description | Recommended | Fixable |
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| ---------------------------- | ----------------------------------------------------------------- | ---------------- | ------------------- |
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| [consistent-test-it][] | Enforce consistent test or it keyword | | ![fixable-green][] |
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| [expect-expect][] | Enforce assertion to be made in a test body | | |
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| [lowercase-name][] | Disallow capitalized test names | | ![fixable-green][] |
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| [no-alias-methods][] | Disallow alias methods | ![recommended][] | ![fixable-green][] |
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| [no-commented-out-tests][] | Disallow commented out tests | | |
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| [no-disabled-tests][] | Disallow disabled tests | ![recommended][] | |
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| [no-duplicate-hooks][] | Disallow duplicate hooks within a `describe` block | | |
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| [no-empty-title][] | Disallow empty titles | | |
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| [no-expect-resolves][] | Disallow using `expect().resolves` | | |
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| [no-export][] | Disallow export from test files | | |
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| [no-focused-tests][] | Disallow focused tests | ![recommended][] | |
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| [no-hooks][] | Disallow setup and teardown hooks | | |
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| [no-identical-title][] | Disallow identical titles | ![recommended][] | |
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| [no-if][] | Disallow conditional logic | | |
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| [no-jasmine-globals][] | Disallow Jasmine globals | ![recommended][] | ![fixable-yellow][] |
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| [no-jest-import][] | Disallow importing `jest` | ![recommended][] | |
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| [no-large-snapshots][] | Disallow large snapshots | | |
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| [no-mocks-import][] | Disallow manually importing from `__mocks__` | | |
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| [no-standalone-expect][] | Prevents `expect` statements outside of a `test` or `it` block | | |
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| [no-test-callback][] | Using a callback in asynchronous tests | | ![fixable-green][] |
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| [no-test-prefixes][] | Disallow using `f` & `x` prefixes to define focused/skipped tests | ![recommended][] | ![fixable-green][] |
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| [no-test-return-statement][] | Disallow explicitly returning from tests | | |
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| [no-truthy-falsy][] | Disallow using `toBeTruthy()` & `toBeFalsy()` | | |
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| [no-try-expect][] | Prevent `catch` assertions in tests | | |
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| [prefer-called-with][] | Suggest using `toBeCalledWith()` OR `toHaveBeenCalledWith()` | | |
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| [prefer-expect-assertions][] | Suggest using `expect.assertions()` OR `expect.hasAssertions()` | | |
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| [prefer-inline-snapshots][] | Suggest using `toMatchInlineSnapshot()` | | ![fixable-green][] |
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| [prefer-spy-on][] | Suggest using `jest.spyOn()` | | ![fixable-green][] |
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| [prefer-strict-equal][] | Suggest using `toStrictEqual()` | | ![fixable-green][] |
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| [prefer-to-be-null][] | Suggest using `toBeNull()` | | ![fixable-green][] |
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| [prefer-to-be-undefined][] | Suggest using `toBeUndefined()` | | ![fixable-green][] |
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| [prefer-to-contain][] | Suggest using `toContain()` | | ![fixable-green][] |
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| [prefer-to-have-length][] | Suggest using `toHaveLength()` | | ![fixable-green][] |
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| [prefer-todo][] | Suggest using `test.todo()` | | ![fixable-green][] |
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| [require-tothrow-message][] | Require that `toThrow()` and `toThrowError` includes a message | | |
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| [valid-describe][] | Enforce valid `describe()` callback | ![recommended][] | |
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| [valid-expect-in-promise][] | Enforce having return statement when testing with promises | ![recommended][] | |
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| [valid-expect][] | Enforce valid `expect()` usage | ![recommended][] | |
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| Rule | Description | Recommended | Fixable |
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| ------------------------------ | ----------------------------------------------------------------- | ---------------- | ------------------- |
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| [consistent-test-it][] | Enforce consistent test or it keyword | | ![fixable-green][] |
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| [expect-expect][] | Enforce assertion to be made in a test body | | |
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| [lowercase-name][] | Disallow capitalized test names | | ![fixable-green][] |
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| [no-alias-methods][] | Disallow alias methods | ![recommended][] | ![fixable-green][] |
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| [no-commented-out-tests][] | Disallow commented out tests | | |
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| [no-disabled-tests][] | Disallow disabled tests | ![recommended][] | |
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| [no-duplicate-hooks][] | Disallow duplicate hooks within a `describe` block | | |
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| [no-empty-title][] | Disallow empty titles | | |
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| [no-expect-resolves][] | Disallow using `expect().resolves` | | |
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| [no-export][] | Disallow export from test files | | |
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| [no-focused-tests][] | Disallow focused tests | ![recommended][] | |
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| [no-hooks][] | Disallow setup and teardown hooks | | |
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| [no-identical-title][] | Disallow identical titles | ![recommended][] | |
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| [no-if][] | Disallow conditional logic | | |
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| [no-jasmine-globals][] | Disallow Jasmine globals | ![recommended][] | ![fixable-yellow][] |
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| [no-jest-import][] | Disallow importing `jest` | ![recommended][] | |
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| [no-large-snapshots][] | Disallow large snapshots | | |
126+
| [no-mocks-import][] | Disallow manually importing from `__mocks__` | | |
127+
| [no-standalone-expect][] | Prevents `expect` statements outside of a `test` or `it` block | | |
128+
| [no-test-callback][] | Using a callback in asynchronous tests | | ![fixable-green][] |
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| [no-test-prefixes][] | Disallow using `f` & `x` prefixes to define focused/skipped tests | ![recommended][] | ![fixable-green][] |
130+
| [no-test-return-statement][] | Disallow explicitly returning from tests | | |
131+
| [no-truthy-falsy][] | Disallow using `toBeTruthy()` & `toBeFalsy()` | | |
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| [no-try-expect][] | Prevent `catch` assertions in tests | | |
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| [prefer-called-with][] | Suggest using `toBeCalledWith()` OR `toHaveBeenCalledWith()` | | |
134+
| [prefer-expect-assertions][] | Suggest using `expect.assertions()` OR `expect.hasAssertions()` | | |
135+
| [prefer-inline-snapshots][] | Suggest using `toMatchInlineSnapshot()` | | ![fixable-green][] |
136+
| [prefer-spy-on][] | Suggest using `jest.spyOn()` | | ![fixable-green][] |
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| [prefer-strict-equal][] | Suggest using `toStrictEqual()` | | ![fixable-green][] |
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| [prefer-to-be-null][] | Suggest using `toBeNull()` | | ![fixable-green][] |
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| [prefer-to-be-undefined][] | Suggest using `toBeUndefined()` | | ![fixable-green][] |
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| [prefer-to-contain][] | Suggest using `toContain()` | | ![fixable-green][] |
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| [prefer-to-have-length][] | Suggest using `toHaveLength()` | | ![fixable-green][] |
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| [prefer-todo][] | Suggest using `test.todo()` | | ![fixable-green][] |
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| [require-top-level-describe][] | Require a top-level `describe` block | | |
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| [require-tothrow-message][] | Require that `toThrow()` and `toThrowError` includes a message | | |
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| [valid-describe][] | Enforce valid `describe()` callback | ![recommended][] | |
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| [valid-expect-in-promise][] | Enforce having return statement when testing with promises | ![recommended][] | |
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| [valid-expect][] | Enforce valid `expect()` usage | ![recommended][] | |
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## Credit
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@@ -193,6 +194,7 @@ https://github.com/dangreenisrael/eslint-plugin-jest-formatting
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[prefer-to-contain]: docs/rules/prefer-to-contain.md
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[prefer-to-have-length]: docs/rules/prefer-to-have-length.md
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[prefer-todo]: docs/rules/prefer-todo.md
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[require-top-level-describe]: docs/rules/require-top-level-describe.md
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[require-tothrow-message]: docs/rules/require-tothrow-message.md
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[valid-describe]: docs/rules/valid-describe.md
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[valid-expect-in-promise]: docs/rules/valid-expect-in-promise.md

‎docs/rules/require-top-level-describe.md‎

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# Require top-level describe block (require-top-level-describe)
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Jest allows you to organise your test files the way you want it. However, the
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more your codebase grows, the more it becomes hard to navigate in your test
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files. This rule makes sure that you provide at least a top-level describe block
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in your test file.
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## Rule Details
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This rule triggers a warning if a test case (`test` and `it`) or a hook
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(`beforeAll`, `beforeEach`, `afterEach`, `afterAll`) is not located in a
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top-level describe block.
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The following patterns are considered warnings:
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```js
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// Above a describe block
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test('my test', () => {});
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describe('test suite', () => {
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it('test', () => {});
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});
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// Below a describe block
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describe('test suite', () => {});
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test('my test', () => {});
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// Same for hooks
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beforeAll('my beforeAll', () => {});
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describe('test suite', () => {});
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afterEach('my afterEach', () => {});
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```
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The following patterns are **not** considered warnings:
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```js
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// In a describe block
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describe('test suite', () => {
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test('my test', () => {});
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});
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// In a nested describe block
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describe('test suite', () => {
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test('my test', () => {});
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describe('another test suite', () => {
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test('my other test', () => {});
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});
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});
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```
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## When Not To Use It
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Don't use this rule on non-jest test files.

‎src/__tests__/rules.test.ts‎

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import plugin from '../';
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const ruleNames = Object.keys(plugin.rules);
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const numberOfRules = 38;
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const numberOfRules = 39;
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describe('rules', () => {
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it('should have a corresponding doc for each rule', () => {

‎src/rules/__tests__/require-top-level-describe.test.ts‎

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import { TSESLint } from '@typescript-eslint/experimental-utils';
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import rule from '../require-top-level-describe';
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const ruleTester = new TSESLint.RuleTester({
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parserOptions: {
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ecmaVersion: 2015,
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},
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});
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ruleTester.run('no-standalone-hook', rule, {
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valid: [
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'describe("test suite", () => { test("my test") });',
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'describe("test suite", () => { it("my test") });',
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`
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describe("test suite", () => {
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beforeEach("a", () => {});
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describe("b", () => {});
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test("c", () => {})
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});
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`,
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'describe("test suite", () => { beforeAll("my beforeAll") });',
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'describe("test suite", () => { afterEach("my afterEach") });',
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'describe("test suite", () => { afterAll("my afterAll") });',
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`
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describe("test suite", () => {
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it("my test", () => {})
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describe("another test suite", () => {
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});
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test("my other test", () => {})
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});
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`,
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'foo()',
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],
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invalid: [
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{
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code: 'beforeEach("my test", () => {})',
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errors: [{ messageId: 'unexpectedHook' }],
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},
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{
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code: `
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test("my test", () => {})
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describe("test suite", () => {});
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`,
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errors: [{ messageId: 'unexpectedTestCase' }],
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},
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{
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code: `
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test("my test", () => {})
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describe("test suite", () => {
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it("test", () => {})
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});
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`,
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errors: [{ messageId: 'unexpectedTestCase' }],
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},
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{
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code: `
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describe("test suite", () => {});
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afterAll("my test", () => {})
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`,
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errors: [{ messageId: 'unexpectedHook' }],
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},
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],
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});

‎src/rules/require-top-level-describe.ts‎

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import { TSESTree } from '@typescript-eslint/experimental-utils';
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import { createRule, isDescribe, isHook, isTestCase } from './utils';
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export default createRule({
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name: __filename,
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meta: {
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docs: {
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category: 'Best Practices',
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description:
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'Prevents test cases and hooks to be outside of a describe block',
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recommended: false,
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},
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messages: {
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unexpectedTestCase: 'All test cases must be wrapped in a describe block.',
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unexpectedHook: 'All hooks must be wrapped in a describe block.',
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},
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type: 'suggestion',
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schema: [],
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},
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defaultOptions: [],
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create(context) {
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let numberOfDescribeBlocks = 0;
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return {
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CallExpression(node) {
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if (isDescribe(node)) {
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numberOfDescribeBlocks++;
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return;
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}
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if (numberOfDescribeBlocks === 0) {
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if (isTestCase(node)) {
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context.report({ node, messageId: 'unexpectedTestCase' });
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return;
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}
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if (isHook(node)) {
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context.report({ node, messageId: 'unexpectedHook' });
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return;
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}
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}
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},
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'CallExpression:exit'(node: TSESTree.CallExpression) {
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if (isDescribe(node)) {
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numberOfDescribeBlocks--;
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}
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},
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};
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},
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});

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