fix: allow hyphens in project config file name pattern

docs/guide/projects.md

@@ -42,11 +42,17 @@ export default defineConfig({
 })
 ```
 
-Vitest will treat every folder in `packages` as a separate project even if it doesn't have a config file inside. If the glob pattern matches a file, it will validate that the name starts with `vitest.config`/`vite.config` or matches `(vite|vitest).*.config.*` pattern to ensure it's a Vitest configuration file. For example, these config files are valid:
+Vitest will treat every folder in `packages` as a separate project even if it doesn't have a config file inside. If a project entry resolves to a file (either from a glob pattern or a direct file path), Vitest will validate that the name either:
+
+- starts with `vitest.config` or `vite.config` (for example, `vitest.config.unit.ts`)
+- or matches `vitest.<name>.config.*` / `vite.<name>.config.*`, where `<name>` can contain letters, numbers, `_`, and `-`
+
+For example, these config files are valid:
 
 - `vitest.config.ts`
 - `vite.config.js`
 - `vitest.unit.config.ts`
+- `vitest.e2e-node.config.ts`
 - `vite.e2e.config.js`
 - `vitest.config.unit.js`
 - `vite.config.e2e.js`

packages/vitest/src/node/projects/resolveProjects.ts

@@ -22,7 +22,8 @@ import { initializeProject, TestProject } from '../project'
 // vite.config.*
 // vitest.unit.config.*
 // vite.unit.config.*
-const CONFIG_REGEXP = /^vite(?:st)?(?:\.\w+)?\.config\./
+// vitest.unit-test.config.*
+const CONFIG_REGEXP = /^vite(?:st)?(?:\.[\w-]+)?\.config\./
 
 export async function resolveProjects(
   vitest: Vitest,

test/cli/test/projects.test.ts

@@ -181,6 +181,34 @@ describe('the config file names', () => {
     expect(exitCode).toBe(0)
   })
 
+  it('[glob] the name has "unit-test" (with hyphen) between "vitest" and "config" and works', async () => {
+    const { exitCode } = await runInlineTests({
+      'vitest.unit-test.config.js': {},
+      'vitest.config.js': {
+        test: {
+          passWithNoTests: true,
+          projects: ['./vitest.*.config.js'],
+        },
+      },
+    })
+
+    expect(exitCode).toBe(0)
+  })
+
+  it('[file] the name has "unit-test" (with hyphen) between "vitest" and "config" and works', async () => {
+    const { exitCode } = await runInlineTests({
+      'vitest.unit-test.config.js': {},
+      'vitest.config.js': {
+        test: {
+          passWithNoTests: true,
+          projects: ['./vitest.unit-test.config.js'],
+        },
+      },
+    })
+
+    expect(exitCode).toBe(0)
+  })
+
   it('[file] the name does not start with "vite"/"vitest" and throws an error', async () => {
     const { stderr } = await runInlineTests({
       'unit.config.js': {},