fix(watch): junit reporter fails to re-generate report

packages/vitest/src/node/reporters/junit.ts

@@ -92,7 +92,12 @@ export class JUnitReporter implements Reporter {
       const fileFd = await fs.open(this.reportFile, 'w+')
       this.fileFd = fileFd
 
-      this.baseLog = async (text: string) => await fs.writeFile(fileFd, `${text}\n`)
+      this.baseLog = async (text: string) => {
+        if (!this.fileFd)
+          this.fileFd = await fs.open(this.reportFile!, 'w+')
+
+        await fs.writeFile(this.fileFd, `${text}\n`)
+      }
     }
     else {
       this.baseLog = async (text: string) => this.ctx.logger.log(text)
@@ -248,5 +253,6 @@ export class JUnitReporter implements Reporter {
       this.ctx.logger.log(`JUNIT report written to ${this.reportFile}`)
 
     await this.fileFd?.close()
+    this.fileFd = undefined
   }
 }

test/test-utils/index.ts

@@ -115,7 +115,7 @@ export async function runVitestCli(_options?: Options | string, ...args: string[
           return resolve()
 
         const timeout = setTimeout(() => {
-          reject(new Error(`Timeout when waiting for output "${expected}".\nReceived:\n${this.stdout}`))
+          reject(new Error(`Timeout when waiting for output "${expected}".\nReceived:\n${this.stdout}. \nStderr:\n${this.stderr}`))
         }, process.env.CI ? 20_000 : 4_000)
 
         const listener = () => {

test/watch/.gitignore

@@ -0,0 +1 @@
+fixtures/test-results

test/watch/test/file-watching.test.ts

@@ -1,5 +1,5 @@
-import { readFileSync, rmSync, writeFileSync } from 'node:fs'
-import { afterEach, describe, test } from 'vitest'
+import { existsSync, readFileSync, rmSync, writeFileSync } from 'node:fs'
+import { afterEach, describe, expect, test } from 'vitest'
 
 import { runVitestCli } from '../../test-utils'
 
@@ -88,6 +88,35 @@ test("dynamic test case", () => {
   await vitest.waitForStdout('1 passed')
 })
 
+test('editing source file generates new test report to file system', async () => {
+  const report = 'fixtures/test-results/junit.xml'
+  if (existsSync(report))
+    rmSync(report)
+
+  // Test report should not be present before test run
+  expect(existsSync(report)).toBe(false)
+
+  const vitest = await runVitestCli(
+    ...cliArgs,
+    '--reporter', 'verbose',
+    '--reporter', 'junit',
+    '--output-file', 'test-results/junit.xml',
+  )
+
+  // Test report should be generated on initial test run
+  expect(existsSync(report)).toBe(true)
+
+  // Test report should be re-generated on second test run
+  rmSync(report)
+  expect(existsSync(report)).toBe(false)
+
+  writeFileSync(sourceFile, editFile(sourceFileContent), 'utf8')
+
+  await vitest.waitForStdout('JUNIT report written')
+  await vitest.waitForStdout(report)
+  expect(existsSync(report)).toBe(true)
+})
+
 describe('browser', () => {
   test.runIf((process.platform !== 'win32'))('editing source file triggers re-run', async () => {
     const vitest = await runVitestCli(...cliArgs, '--browser.enabled', '--browser.headless', '--browser.name=chrome')