fix(runner): nested tests should throw errors

packages/runner/src/suite.ts

@@ -6,11 +6,15 @@ import { collectTask, collectorContext, createTestContext, runWithSuite, withTim
 import { getHooks, setFixture, setFn, setHooks } from './map'
 import type { FixtureItem } from './fixture'
 import { mergeContextFixtures, withFixtures } from './fixture'
+import { getCurrentTest } from './test-state'
 
 // apis
 export const suite = createSuite()
 export const test = createTest(
   function (name: string | Function, fn?: TestFunction, options?: number | TestOptions) {
+    if (getCurrentTest())
+      throw new Error('Nested tests are not allowed')
+
     getCurrentSuite().test.fn.call(this, formatName(name), fn, options)
   },
 )

test/core/test/nested-test.test.ts

@@ -0,0 +1,30 @@
+import { describe, expect, test } from 'vitest'
+
+test('nested test should throw error', () => {
+  expect(() => {
+    test('test inside test', () => {})
+  }).toThrowErrorMatchingInlineSnapshot(`"Nested tests are not allowed"`)
+
+  expect(() => {
+    test.each([1, 2, 3])('test.each inside test %d', () => {})
+  }).toThrowErrorMatchingInlineSnapshot(`"Nested tests are not allowed"`)
+
+  expect(() => {
+    test.skipIf(false)('test.skipIf inside test', () => {})
+  }).toThrowErrorMatchingInlineSnapshot(`"Nested tests are not allowed"`)
+})
+
+describe('parallel tests', () => {
+  test.concurrent('parallel test 1 with nested test', () => {
+    expect(() => {
+      test('test inside test', () => {})
+    }).toThrowErrorMatchingInlineSnapshot(`"Nested tests are not allowed"`)
+  })
+  test.concurrent('parallel test 2 without nested test', () => {})
+  test.concurrent('parallel test 3 without nested test', () => {})
+  test.concurrent('parallel test 4 with nested test', () => {
+    expect(() => {
+      test('test inside test', () => {})
+    }).toThrowErrorMatchingInlineSnapshot(`"Nested tests are not allowed"`)
+  })
+})