test(config): add integration test (#1353)

Add integration test for #1347.

test/global-setup/setupFiles/without-relative-path-prefix.ts

@@ -0,0 +1,11 @@
+import { afterAll, beforeAll } from 'vitest'
+
+beforeAll(() => {
+  // @ts-expect-error type
+  global.loaded = true
+})
+
+afterAll(() => {
+  // @ts-expect-error type
+  delete global.loaded
+})

test/global-setup/test/setup-files.test.ts

@@ -5,3 +5,9 @@ test('something has been added to global by setupFiles entry', async () => {
   const result = something
   expect(result).toBe('something')
 })
+
+test('setup file has been loaded without relative path prefix', () => {
+  // @ts-expect-error type
+  const result = loaded
+  expect(result).toBeTruthy()
+})

test/global-setup/vitest.config.ts

@@ -6,7 +6,12 @@ export default defineConfig({
   plugins: [{
     name: 'a-vitest-plugin-that-changes-config',
     config: () => ({
-      test: { setupFiles: ['./setupFiles/add-something-to-global.ts'] },
+      test: {
+        setupFiles: [
+          './setupFiles/add-something-to-global.ts',
+          'setupFiles/without-relative-path-prefix.ts',
+        ],
+      },
     }),
   }],
   test: {