feat: support using function/class as describe/test name

docs/api/index.md

@@ -36,7 +36,7 @@ In Jest, `TestFunction` can also be of type `(done: DoneCallback) => void`. If t
 
 ## test
 
-- **Type:** `(name: string, fn: TestFunction, timeout?: number | TestOptions) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, timeout?: number | TestOptions) => void`
 - **Alias:** `it`
 
   `test` defines a set of related expectations. It receives the test name and a function that holds the expectations to test.
@@ -53,7 +53,7 @@ In Jest, `TestFunction` can also be of type `(done: DoneCallback) => void`. If t
 
 ### test.skip
 
-- **Type:** `(name: string, fn: TestFunction, timeout?: number | TestOptions) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, timeout?: number | TestOptions) => void`
 - **Alias:** `it.skip`
 
   If you want to skip running certain tests, but you don't want to delete the code due to any reason, you can use `test.skip` to avoid running them.
@@ -111,7 +111,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### test.only
 
-- **Type:** `(name: string, fn: TestFunction, timeout?: number) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, timeout?: number) => void`
 - **Alias:** `it.only`
 
   Use `test.only` to only run certain tests in a given suite. This is useful when debugging.
@@ -136,7 +136,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### test.concurrent
 
-- **Type:** `(name: string, fn: TestFunction, timeout?: number) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, timeout?: number) => void`
 - **Alias:** `it.concurrent`
 
   `test.concurrent` marks consecutive tests to be run in parallel. It receives the test name, an async function with the tests to collect, and an optional timeout (in milliseconds).
@@ -179,7 +179,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### test.todo
 
-- **Type:** `(name: string) => void`
+- **Type:** `(name: string | Function) => void`
 - **Alias:** `it.todo`
 
   Use `test.todo` to stub tests to be implemented later. An entry will be shown in the report for the tests so you know how many tests you still need to implement.
@@ -191,7 +191,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### test.fails
 
-- **Type:** `(name: string, fn: TestFunction, timeout?: number) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, timeout?: number) => void`
 - **Alias:** `it.fails`
 
   Use `test.fails` to indicate that an assertion will fail explicitly.
@@ -502,7 +502,7 @@ When you use `test` or `bench` in the top level of file, they are collected as p
 
 ### describe.skip
 
-- **Type:** `(name: string, fn: TestFunction, options?: number | TestOptions) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, options?: number | TestOptions) => void`
 
   Use `describe.skip` in a suite to avoid running a particular describe block.
 
@@ -539,7 +539,7 @@ You cannot use this syntax when using Vitest as [type checker](/guide/testing-ty
 
 ### describe.only
 
-- **Type:** `(name: string, fn: TestFunction, options?: number | TestOptions) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, options?: number | TestOptions) => void`
 
   Use `describe.only` to only run certain suites
 
@@ -565,7 +565,7 @@ You cannot use this syntax when using Vitest as [type checker](/guide/testing-ty
 
 ### describe.concurrent
 
-- **Type:** `(name: string, fn: TestFunction, options?: number | TestOptions) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, options?: number | TestOptions) => void`
 
   `describe.concurrent` in a suite marks every tests as concurrent
 
@@ -606,7 +606,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### describe.shuffle
 
-- **Type:** `(name: string, fn: TestFunction, options?: number | TestOptions) => void`
+- **Type:** `(name: string | Function, fn: TestFunction, options?: number | TestOptions) => void`
 
   Vitest provides a way to run all tests in random order via CLI flag [`--sequence.shuffle`](/guide/cli) or config option [`sequence.shuffle`](/config/#sequence-shuffle), but if you want to have only part of your test suite to run tests in random order, you can mark it with this flag.
 
@@ -627,7 +627,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### describe.todo
 
-- **Type:** `(name: string) => void`
+- **Type:** `(name: string | Function) => void`
 
   Use `describe.todo` to stub suites to be implemented later. An entry will be shown in the report for the tests so you know how many tests you still need to implement.
 
@@ -638,7 +638,7 @@ You cannot use this syntax, when using Vitest as [type checker](/guide/testing-t
 
 ### describe.each
 
-- **Type:** `(cases: ReadonlyArray<T>, ...args: any[]): (name: string, fn: (...args: T[]) => void, options?: number | TestOptions) => void`
+- **Type:** `(cases: ReadonlyArray<T>, ...args: any[]): (name: string | Function, fn: (...args: T[]) => void, options?: number | TestOptions) => void`
 
   Use `describe.each` if you have more than one test that depends on the same data.
 

packages/runner/src/suite.ts

@@ -8,8 +8,8 @@ import { getHooks, setFn, setHooks } from './map'
 // apis
 export const suite = createSuite()
 export const test = createTest(
-  function (name: string, fn?: TestFunction, options?: number | TestOptions) {
-    getCurrentSuite().test.fn.call(this, name, fn, options)
+  function (name: string | Function, fn?: TestFunction, options?: number | TestOptions) {
+    getCurrentSuite().test.fn.call(this, formatName(name), fn, options)
   },
 )
 
@@ -59,7 +59,7 @@ function createSuiteCollector(name: string, factory: SuiteFactory = () => { }, m
 
   initSuite()
 
-  const test = createTest(function (name: string, fn = noop, options) {
+  const test = createTest(function (name: string | Function, fn = noop, options) {
     const mode = this.only ? 'only' : this.skip ? 'skip' : this.todo ? 'todo' : 'run'
 
     if (typeof options === 'number')
@@ -78,7 +78,7 @@ function createSuiteCollector(name: string, factory: SuiteFactory = () => { }, m
     const test: Test = {
       id: '',
       type: 'test',
-      name,
+      name: formatName(name),
       each: this.each,
       mode,
       suite: undefined!,
@@ -189,7 +189,7 @@ function createSuiteCollector(name: string, factory: SuiteFactory = () => { }, m
 }
 
 function createSuite() {
-  function suiteFn(this: Record<string, boolean | undefined>, name: string, factory?: SuiteFactory, options?: number | TestOptions) {
+  function suiteFn(this: Record<string, boolean | undefined>, name: string | Function, factory?: SuiteFactory, options?: number | TestOptions) {
     const mode: RunMode = this.only ? 'only' : this.skip ? 'skip' : this.todo ? 'todo' : 'run'
     const currentSuite = getCurrentSuite()
 
@@ -200,7 +200,7 @@ function createSuite() {
     if (currentSuite?.options)
       options = { ...currentSuite.options, ...options }
 
-    return createSuiteCollector(name, factory, mode, this.concurrent, this.shuffle, this.each, options)
+    return createSuiteCollector(formatName(name), factory, mode, this.concurrent, this.shuffle, this.each, options)
   }
 
   suiteFn.each = function<T>(this: { withContext: () => SuiteAPI; setContext: (key: string, value: boolean | undefined) => SuiteAPI }, cases: ReadonlyArray<T>, ...args: any[]) {
@@ -210,13 +210,14 @@ function createSuite() {
     if (Array.isArray(cases) && args.length)
       cases = formatTemplateString(cases, args)
 
-    return (name: string, fn: (...args: T[]) => void, options?: number | TestOptions) => {
+    return (name: string | Function, fn: (...args: T[]) => void, options?: number | TestOptions) => {
+      const _name = formatName(name)
       const arrayOnlyCases = cases.every(Array.isArray)
       cases.forEach((i, idx) => {
         const items = Array.isArray(i) ? i : [i]
         arrayOnlyCases
-          ? suite(formatTitle(name, items, idx), () => fn(...items), options)
-          : suite(formatTitle(name, items, idx), () => fn(i), options)
+          ? suite(formatTitle(_name, items, idx), () => fn(...items), options)
+          : suite(formatTitle(_name, items, idx), () => fn(i), options)
       })
 
       this.setContext('each', undefined)
@@ -249,14 +250,15 @@ function createTest(fn: (
     if (Array.isArray(cases) && args.length)
       cases = formatTemplateString(cases, args)
 
-    return (name: string, fn: (...args: T[]) => void, options?: number | TestOptions) => {
+    return (name: string | Function, fn: (...args: T[]) => void, options?: number | TestOptions) => {
+      const _name = formatName(name)
       const arrayOnlyCases = cases.every(Array.isArray)
       cases.forEach((i, idx) => {
         const items = Array.isArray(i) ? i : [i]
 
         arrayOnlyCases
-          ? test(formatTitle(name, items, idx), () => fn(...items), options)
-          : test(formatTitle(name, items, idx), () => fn(i), options)
+          ? test(formatTitle(_name, items, idx), () => fn(...items), options)
+          : test(formatTitle(_name, items, idx), () => fn(i), options)
       })
 
       this.setContext('each', undefined)
@@ -272,6 +274,10 @@ function createTest(fn: (
   ) as TestAPI
 }
 
+function formatName(name: string | Function) {
+  return typeof name === 'string' ? name : name instanceof Function ? name.name : String(name)
+}
+
 function formatTitle(template: string, items: any[], idx: number) {
   if (template.includes('%#')) {
     // '%#' match index of the test case

packages/runner/src/types/tasks.ts

@@ -112,49 +112,49 @@ type ExtractEachCallbackArgs<T extends ReadonlyArray<any>> = {
 
 interface SuiteEachFunction {
   <T extends any[] | [any]>(cases: ReadonlyArray<T>): (
-    name: string,
+    name: string | Function,
     fn: (...args: T) => Awaitable<void>,
   ) => void
   <T extends ReadonlyArray<any>>(cases: ReadonlyArray<T>): (
-    name: string,
+    name: string | Function,
     fn: (...args: ExtractEachCallbackArgs<T>) => Awaitable<void>,
   ) => void
   <T>(cases: ReadonlyArray<T>): (
-    name: string,
+    name: string | Function,
     fn: (...args: T[]) => Awaitable<void>,
   ) => void
 }
 
 interface TestEachFunction {
   <T extends any[] | [any]>(cases: ReadonlyArray<T>): (
-    name: string,
+    name: string | Function,
     fn: (...args: T) => Awaitable<void>,
     options?: number | TestOptions,
   ) => void
   <T extends ReadonlyArray<any>>(cases: ReadonlyArray<T>): (
-    name: string,
+    name: string | Function,
     fn: (...args: ExtractEachCallbackArgs<T>) => Awaitable<void>,
     options?: number | TestOptions,
   ) => void
   <T>(cases: ReadonlyArray<T>): (
-    name: string,
+    name: string | Function,
     fn: (...args: T[]) => Awaitable<void>,
     options?: number | TestOptions,
   ) => void
   (...args: [TemplateStringsArray, ...any]): (
-    name: string,
+    name: string | Function,
     fn: (...args: any[]) => Awaitable<void>,
     options?: number | TestOptions,
   ) => void
 }
 
 type ChainableTestAPI<ExtraContext = {}> = ChainableFunction<
   'concurrent' | 'only' | 'skip' | 'todo' | 'fails',
-  [name: string, fn?: TestFunction<ExtraContext>, options?: number | TestOptions],
+  [name: string | Function, fn?: TestFunction<ExtraContext>, options?: number | TestOptions],
   void,
   {
     each: TestEachFunction
-    <T extends ExtraContext>(name: string, fn?: TestFunction<T>, options?: number | TestOptions): void
+    <T extends ExtraContext>(name: string | Function, fn?: TestFunction<T>, options?: number | TestOptions): void
   }
 >
 
@@ -188,11 +188,11 @@ export type TestAPI<ExtraContext = {}> = ChainableTestAPI<ExtraContext> & {
 
 type ChainableSuiteAPI<ExtraContext = {}> = ChainableFunction<
   'concurrent' | 'only' | 'skip' | 'todo' | 'shuffle',
-  [name: string, factory?: SuiteFactory<ExtraContext>, options?: number | TestOptions],
+  [name: string | Function, factory?: SuiteFactory<ExtraContext>, options?: number | TestOptions],
   SuiteCollector<ExtraContext>,
   {
     each: TestEachFunction
-    <T extends ExtraContext>(name: string, factory?: SuiteFactory<T>): SuiteCollector<T>
+    <T extends ExtraContext>(name: string | Function, factory?: SuiteFactory<T>): SuiteCollector<T>
   }
 >
 
@@ -226,7 +226,7 @@ export interface SuiteCollector<ExtraContext = {}> {
   on: <T extends keyof SuiteHooks<ExtraContext>>(name: T, ...fn: SuiteHooks<ExtraContext>[T]) => void
 }
 
-export type SuiteFactory<ExtraContext = {}> = (test: (name: string, fn: TestFunction<ExtraContext>) => void) => Awaitable<void>
+export type SuiteFactory<ExtraContext = {}> = (test: (name: string | Function, fn: TestFunction<ExtraContext>) => void) => Awaitable<void>
 
 export interface RuntimeContext {
   tasks: (SuiteCollector | Test)[]

test/describe-test-name/fixtures/test/example.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, test } from 'vitest'
+
+function foo() {}
+class Bar {}
+
+describe(foo, () => {
+  test(Bar, () => {
+    expect(0).toBe(1)
+  })
+})
+
+describe(Bar, () => {
+  test(foo, () => {
+    expect(0).toBe(1)
+  })
+})
+
+describe.each([1])(foo, () => {
+  test.each([1])(foo, () => {
+    expect(0).toBe(1)
+  })
+})
+
+describe.each([1])(Bar, () => {
+  test.each([1])(Bar, () => {
+    expect(0).toBe(1)
+  })
+})

test/describe-test-name/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "@vitest/test-describe-test-name",
+  "private": true,
+  "scripts": {
+    "test": "vitest run"
+  },
+  "devDependencies": {
+    "vitest": "workspace:*"
+  }
+}

test/describe-test-name/test/runner.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from 'vitest'
+import { resolve } from 'pathe'
+import { runVitest } from '../../test-utils'
+
+test('should print function name', async () => {
+  const filename = resolve('./fixtures/test/example.test.ts')
+  const { stderr } = await runVitest({ root: './fixtures' }, [filename])
+
+  expect(stderr).toBeTruthy()
+  expect(stderr).toContain('FAIL  test/example.test.ts > foo > Bar')
+  expect(stderr).toContain('FAIL  test/example.test.ts > Bar > foo')
+  expect(stderr).toContain('FAIL  test/example.test.ts > foo > foo')
+  expect(stderr).toContain('FAIL  test/example.test.ts > Bar > Bar')
+})

test/describe-test-name/vitest.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    include: ['test/**/*.test.*'],
+  },
+})