112 lines
2.5 KiB
Markdown
112 lines
2.5 KiB
Markdown
# Enforce lowercase test names (`prefer-lowercase-title`)
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🔧 This rule is automatically fixable by the
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[`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
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<!-- end auto-generated rule header -->
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## Rule details
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Enforce `it`, `test` and `describe` to have descriptions that begin with a
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lowercase letter. This provides more readable test failures. This rule is not
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enabled by default.
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The following pattern is considered a warning:
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```js
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it('Adds 1 + 2 to equal 3', () => {
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expect(sum(1, 2)).toBe(3);
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});
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```
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The following pattern is not considered a warning:
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```js
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it('adds 1 + 2 to equal 3', () => {
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expect(sum(1, 2)).toBe(3);
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});
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```
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## Options
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```json
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{
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"jest/prefer-lowercase-title": [
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"error",
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{
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"ignore": ["describe", "test"]
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}
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]
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}
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```
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### `ignore`
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This array option controls which Jest functions are checked by this rule. There
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are three possible values:
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- `"describe"`
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- `"test"`
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- `"it"`
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By default, none of these options are enabled (the equivalent of
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`{ "ignore": [] }`).
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Example of **correct** code for the `{ "ignore": ["describe"] }` option:
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```js
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/* eslint jest/prefer-lowercase-title: ["error", { "ignore": ["describe"] }] */
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describe('Uppercase description');
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```
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Example of **correct** code for the `{ "ignore": ["test"] }` option:
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```js
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/* eslint jest/prefer-lowercase-title: ["error", { "ignore": ["test"] }] */
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test('Uppercase description');
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```
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Example of **correct** code for the `{ "ignore": ["it"] }` option:
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```js
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/* eslint jest/prefer-lowercase-title: ["error", { "ignore": ["it"] }] */
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it('Uppercase description');
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```
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### `allowedPrefixes`
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This array option allows specifying prefixes, which contain capitals that titles
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can start with. This can be useful when writing tests for API endpoints, where
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you'd like to prefix with the HTTP method.
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By default, nothing is allowed (the equivalent of `{ "allowedPrefixes": [] }`).
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Example of **correct** code for the `{ "allowedPrefixes": ["GET"] }` option:
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```js
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/* eslint jest/prefer-lowercase-title: ["error", { "allowedPrefixes": ["GET"] }] */
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describe('GET /live');
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```
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### `ignoreTopLevelDescribe`
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This option can be set to allow only the top-level `describe` blocks to have a
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title starting with an upper-case letter.
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Example of **correct** code for the `{ "ignoreTopLevelDescribe": true }` option:
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```js
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/* eslint jest/prefer-lowercase-title: ["error", { "ignoreTopLevelDescribe": true }] */
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describe('MyClass', () => {
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describe('#myMethod', () => {
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it('does things', () => {
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//
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});
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});
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});
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```
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