jest/valid-title | Bun Docs

The title is how you find a test in the output when it fails. This rule reports a title that's empty, isn't a string, starts or ends with a space, or repeats its function's name, as in test("test adds an item"). You can add your own naming rules with options.

--fix removes the spaces and the repeated word.

Configure#

Off by default. To turn it on:

bunfig.toml

[lint.rules]
"jest/valid-title" = "error" # or "warn"

Every option, set to its default. The ones that are commented out are unset by default.

bunfig.toml

[lint.rules]
"jest/valid-title" = ["error", {
  allowArguments = false,
  ignoreTypeOfDescribeName = false,
  ignoreTypeOfTestName = false,
  ignoreSpaces = false,
  disallowedWords = [], # list of strings
  # mustMatch = <value>,
  # mustNotMatch = <list of strings>,
}]

Examples#

example.ts5 problems

import { describe, test } from "@jest/globals";

describe("describe cart", () => {
  test("", () => {});
  test(" adds an item", () => {});
  test("test removes an item", () => {});
  test(404, () => {});
});

example.tsNo problems

import { describe, test } from "@jest/globals";

describe("cart", () => {
  test("adds an item", () => {});
  test(`removes ${count} items`, () => {});
  test("responds to " + path, () => {});
});

Options#

Option	Default	What it does
`allowArguments`	`false`	Allow a title that's a plain variable, such as `title`.
`ignoreTypeOfDescribeName`	`false`	Allow a `describe` title that isn't a string.
`ignoreTypeOfTestName`	`false`	Allow a `test` or `it` title that isn't a string.
`ignoreSpaces`	`false`	Allow spaces at the start and the end.
`disallowedWords`	`[]`	Whole words that a title can't contain. Case doesn't matter.
`mustMatch`	none	A pattern that every title must match.
`mustNotMatch`	none	A pattern that no title can match.

A variable is reported by default, because the rule can't tell what it holds:

example.ts1 problem

import { test } from "@jest/globals";

test(title, () => {});

example.tswith { "allowArguments": true }No problems

import { test } from "@jest/globals";

test(title, () => {});

ignoreTypeOfDescribeName lets you name a block after the class or function it tests:

example.tswith { "ignoreTypeOfDescribeName": true }No problems

import { describe, test } from "@jest/globals";

describe(Cart.name, () => {
  test("adds an item", () => {});
});

example.tswith { "disallowedWords": ["should"] }1 problem

import { test } from "@jest/globals";

test("Should add an item", () => {});

mustMatch and mustNotMatch take a regular expression as a string, either "^adds " or "/^adds /". Flags after the last / are ignored. To set the report's message, pass [pattern, message]:

example.tswith { "mustNotMatch": ["\\.$", "Do not end a title with a period"] }1 problem

import { test } from "@jest/globals";

test("adds an item.", () => {});

To use a different pattern for describe, test and it, pass an object. A function that isn't in the object isn't checked:

example.tswith { "mustMatch": { "it": "^should " } }1 problem

import { it, test } from "@jest/globals";

it("adds an item", () => {});

test("adds an item", () => {});