feat(cli): support --related in vitest list

docs/guide/cli.md

@@ -121,6 +121,12 @@ tests/test1.test.ts
 tests/test2.test.ts
 ```
 
+Use `--findRelatedTests` to list only the tests that import the specified source files:
+
+```bash
+vitest list --findRelatedTests --filesOnly src/index.ts src/utils.ts
+```
+
 Since Vitest 4.1, you may pass `--static-parse` to [parse test files](/api/advanced/vitest#parsespecifications) instead of running them to collect tests. Vitest parses test files with limited concurrency, defaulting to `os.availableParallelism()`. You can change it via the `--static-parse-concurrency` option.
 
 ### `vitest doctor`

packages/vitest/src/node/cli/cac.ts

@@ -193,7 +193,16 @@ export function createCLI(options: CliParseOptions = {}): CAC {
   addCliOptions(
     cli
       .command('list [...filters]', undefined, options)
-      .action((filters, options) => collect(filters, options)),
+      .action((filters, options) => {
+        if (options.findRelatedTests) {
+          const { findRelatedTests, ...cliOptions } = options
+          return collect([], {
+            ...cliOptions,
+            related: filters,
+          })
+        }
+        return collect(filters, options)
+      }),
     collectCliOptionsConfig,
   )
 
@@ -254,6 +263,11 @@ export function parseCLI(argv: string | string[], config: CliParseOptions = {}):
     options.passWithNoTests ??= true
     args = []
   }
+  if (arrayArgs[2] === 'list' && options.findRelatedTests) {
+    options.related = args as string[]
+    delete options.findRelatedTests
+    args = []
+  }
   return {
     filter: args as string[],
     options,

packages/vitest/src/node/cli/cli-api.ts

@@ -28,6 +28,10 @@ export interface CliOptions extends UserConfig {
    * Output collected test files only
    */
   filesOnly?: boolean
+  /**
+   * List only tests related to the provided source files.
+   */
+  findRelatedTests?: boolean
   /**
    * Parse files statically instead of running them to collect tests
    * @experimental

packages/vitest/src/node/cli/cli-config.ts

@@ -986,6 +986,7 @@ export const cliOptionsConfig: VitestCLIOptions = {
   environmentOptions: null,
   unstubEnvs: null,
   related: null,
+  findRelatedTests: null,
   restoreMocks: null,
   runner: null,
   mockReset: null,
@@ -1029,6 +1030,9 @@ export const collectCliOptionsConfig: VitestCLIOptions = {
     description: 'How many tests to process at the same time (default: os.availableParallelism())',
     argument: '<limit>',
   },
+  findRelatedTests: {
+    description: 'Print only tests related to the specified files',
+  },
   changed: {
     description: 'Print only tests that are affected by the changed files (default: `false`)',
     argument: '[since]',

test/e2e/test/list-related.test.ts

@@ -0,0 +1,147 @@
+import { expect, test } from 'vitest'
+import { replaceRoot, runInlineTests, runVitestCli } from '#test-utils'
+
+const structure = {
+  'src/shared.ts': 'export const shared = true',
+  'src/intermediate.ts': `
+    export { shared } from './shared'
+  `,
+  'src/other.ts': 'export const other = true',
+  'src/unrelated.ts': 'export const unrelated = true',
+  'tests/direct.test.ts': `
+    import { expect, test } from 'vitest'
+    import { shared } from '../src/shared'
+
+    test('direct dependency', () => {
+      expect(shared).toBe(true)
+    })
+  `,
+  'tests/transitive.test.ts': `
+    import { expect, test } from 'vitest'
+    import { shared } from '../src/intermediate'
+
+    test('transitive dependency', () => {
+      expect(shared).toBe(true)
+    })
+  `,
+  'tests/other.test.ts': `
+    import { expect, test } from 'vitest'
+    import { other } from '../src/other'
+
+    test('other dependency', () => {
+      expect(other).toBe(true)
+    })
+  `,
+  'tests/unrelated.test.ts': `
+    import { expect, test } from 'vitest'
+    import { unrelated } from '../src/unrelated'
+
+    test('unrelated dependency', () => {
+      expect(unrelated).toBe(true)
+    })
+  `,
+}
+
+async function setupRelatedTests() {
+  const result = await runInlineTests(structure)
+
+  expect(result.stderr).toBe('')
+  expect(result.testTree()).toMatchInlineSnapshot(`
+    {
+      "tests/direct.test.ts": {
+        "direct dependency": "passed",
+      },
+      "tests/other.test.ts": {
+        "other dependency": "passed",
+      },
+      "tests/transitive.test.ts": {
+        "transitive dependency": "passed",
+      },
+      "tests/unrelated.test.ts": {
+        "unrelated dependency": "passed",
+      },
+    }
+  `)
+
+  return result
+}
+
+test('list --findRelatedTests includes direct and transitive dependents', async () => {
+  const { root } = await setupRelatedTests()
+  const { stdout, stderr, exitCode } = await runVitestCli(
+    'list',
+    `--root=${root}`,
+    '--findRelatedTests',
+    'src/shared.ts',
+  )
+
+  expect(stderr).toBe('')
+  expect(stdout).toMatchInlineSnapshot(`
+    "tests/direct.test.ts > direct dependency
+    tests/transitive.test.ts > transitive dependency
+    "
+  `)
+  expect(exitCode).toBe(0)
+})
+
+test('list --findRelatedTests combines multiple source files', async () => {
+  const { root } = await setupRelatedTests()
+  const { stdout, stderr, exitCode } = await runVitestCli(
+    'list',
+    `--root=${root}`,
+    '--findRelatedTests',
+    'src/shared.ts',
+    'src/other.ts',
+  )
+
+  expect(stderr).toBe('')
+  expect(stdout).toMatchInlineSnapshot(`
+    "tests/direct.test.ts > direct dependency
+    tests/other.test.ts > other dependency
+    tests/transitive.test.ts > transitive dependency
+    "
+  `)
+  expect(exitCode).toBe(0)
+})
+
+test('list --findRelatedTests supports files-only and JSON output', async () => {
+  const { root } = await setupRelatedTests()
+  const filesResult = await runVitestCli(
+    'list',
+    `--root=${root}`,
+    '--findRelatedTests',
+    '--filesOnly',
+    'src/shared.ts',
+  )
+  const jsonResult = await runVitestCli(
+    'list',
+    `--root=${root}`,
+    '--findRelatedTests',
+    'src/shared.ts',
+    '--json',
+  )
+
+  expect(filesResult.stderr).toBe('')
+  expect(filesResult.stdout).toMatchInlineSnapshot(`
+    "tests/direct.test.ts
+    tests/transitive.test.ts
+    "
+  `)
+  expect(filesResult.exitCode).toBe(0)
+
+  expect(jsonResult.stderr).toBe('')
+  expect(replaceRoot(jsonResult.stdout, root)).toMatchInlineSnapshot(`
+    "[
+      {
+        "name": "direct dependency",
+        "file": "<root>/tests/direct.test.ts"
+      },
+      {
+        "name": "transitive dependency",
+        "file": "<root>/tests/transitive.test.ts"
+      }
+    ]
+    "
+  `)
+  expect(jsonResult.exitCode).toBe(0)
+})

test/unit/test/cli-test.test.ts

@@ -420,6 +420,23 @@ test('public parseCLI works correctly', () => {
       'color': true,
     },
   })
+  expect(parseCLI('vitest list --findRelatedTests ./source-a.ts ./source-b.ts')).toEqual({
+    filter: [],
+    options: {
+      'related': ['./source-a.ts', './source-b.ts'],
+      '--': [],
+      'color': true,
+    },
+  })
+  expect(parseCLI('vitest list --findRelatedTests --filesOnly ./source-a.ts ./source-b.ts')).toEqual({
+    filter: [],
+    options: {
+      'related': ['./source-a.ts', './source-b.ts'],
+      'filesOnly': true,
+      '--': [],
+      'color': true,
+    },
+  })
 
   expect(parseCLI('vitest --coverage --browser=chrome')).toEqual({
     filter: [],