test: test importing a file generated during test (#6301)

Co-authored-by: Vladimir <sleuths.slews0s@icloud.com>

test/config/fixtures/fs-cached-check/basic.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "vitest"
+import fs from "node:fs"
+import path from "node:path"
+
+test("import a generated file", async () => {
+  const dist = path.join(import.meta.dirname, "dist");
+  await fs.promises.mkdir(dist, { recursive: true });
+  await fs.promises.writeFile(path.join(dist, "generated.js"), `export default 'ok'`);
+
+  // @ts-ignore generated
+  const mod = await import("./dist/generated.js")
+
+  expect(mod.default).toBe("ok");
+})

test/config/test/fs-cached-check.test.ts

@@ -0,0 +1,14 @@
+import fs from 'node:fs'
+import path from 'node:path'
+import { expect, test } from 'vitest'
+import { runVitest } from '../../test-utils'
+
+test('import a generated file', async () => {
+  // ensure removed first
+  const root = path.resolve('fixtures/fs-cached-check')
+  await fs.promises.rm(path.join(root, 'dist'), { recursive: true, force: true })
+
+  const { stderr, exitCode } = await runVitest({ root })
+  expect(stderr).toBe('')
+  expect(exitCode).toBe(0)
+})