fix(list reporter): do not break after output without trailing eol (#34410)

packages/playwright/src/reporters/list.ts

@@ -129,6 +129,8 @@ class ListReporter extends TerminalReporter {
     if (this._needNewLine) {
       this._needNewLine = false;
       process.stdout.write('\n');
+      ++this._lastRow;
+      this._lastColumn = 0;
     }
   }
 
@@ -210,6 +212,7 @@ class ListReporter extends TerminalReporter {
       process.stdout.write('\n');
     }
     ++this._lastRow;
+    this._lastColumn = 0;
   }
 
   private _updateLine(row: number, text: string, prefix: string) {

packages/playwright/src/worker/workerMain.ts

@@ -75,16 +75,20 @@ export class WorkerMain extends ProcessRunner {
 
     process.on('unhandledRejection', reason => this.unhandledError(reason));
     process.on('uncaughtException', error => this.unhandledError(error));
-    process.stdout.write = (chunk: string | Buffer) => {
+    process.stdout.write = (chunk: string | Buffer, cb?: any) => {
       this.dispatchEvent('stdOut', stdioChunkToParams(chunk));
       this._currentTest?._tracing.appendStdioToTrace('stdout', chunk);
+      if (typeof cb === 'function')
+        process.nextTick(cb);
       return true;
     };
 
     if (!process.env.PW_RUNNER_DEBUG) {
-      process.stderr.write = (chunk: string | Buffer) => {
+      process.stderr.write = (chunk: string | Buffer, cb?: any) => {
         this.dispatchEvent('stdErr', stdioChunkToParams(chunk));
         this._currentTest?._tracing.appendStdioToTrace('stderr', chunk);
+        if (typeof cb === 'function')
+          process.nextTick(cb);
         return true;
       };
     }

tests/playwright-test/playwright-test-fixtures.ts

@@ -229,6 +229,7 @@ export function cleanEnv(env: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
     // END: Reserved CI
     PW_TEST_HTML_REPORT_OPEN: undefined,
     PLAYWRIGHT_HTML_OPEN: undefined,
+    PW_TEST_DEBUG_REPORTERS: undefined,
     PW_TEST_REPORTER: undefined,
     PW_TEST_REPORTER_WS_ENDPOINT: undefined,
     PW_TEST_SOURCE_TRANSFORM: undefined,

tests/playwright-test/reporter-list.spec.ts

@@ -258,6 +258,51 @@ for (const useIntermediateMergeReport of [false, true] as const) {
       expect(text).toContain('1) a.test.ts:3:15 › passes › outer 1.0 › inner 1.1 ──');
       expect(result.exitCode).toBe(1);
     });
+
+    test('print stdio', async ({ runInlineTest }) => {
+      const result = await runInlineTest({
+        'a.test.ts': `
+          import { test, expect } from '@playwright/test';
+          test('passes', async ({}) => {
+            await new Promise(resolve => process.stdout.write('line1', () => resolve()));
+            await new Promise(resolve => process.stdout.write('line2\\n', () => resolve()));
+            await new Promise(resolve => process.stderr.write(Buffer.from(''), () => resolve()));
+          });
+
+          test('passes 2', async ({}) => {
+            await new Promise(resolve => process.stdout.write('partial', () => resolve()));
+          });
+
+          test('passes 3', async ({}) => {
+            await new Promise(resolve => process.stdout.write('full\\n', () => resolve()));
+          });
+
+          test('passes 4', async ({}) => {
+          });
+        `,
+      }, { reporter: 'list' }, { PW_TEST_DEBUG_REPORTERS: '1', PLAYWRIGHT_FORCE_TTY: '80' });
+      expect(result.exitCode).toBe(0);
+      expect(result.passed).toBe(4);
+      const expected = [
+        '#0 :      1 a.test.ts:3:15 › passes',
+        'line1line2',
+        `#0 :   ${POSITIVE_STATUS_MARK} 1 a.test.ts:3:15 › passes`,
+        '',
+        '#3 :      2 a.test.ts:9:15 › passes 2',
+        `partial#3 :   ${POSITIVE_STATUS_MARK} 2 a.test.ts:9:15 › passes 2`,
+        '',
+        '#5 :      3 a.test.ts:13:15 › passes 3',
+        'full',
+        `#5 :   ${POSITIVE_STATUS_MARK} 3 a.test.ts:13:15 › passes 3`,
+        '#7 :      4 a.test.ts:17:15 › passes 4',
+        `#7 :   ${POSITIVE_STATUS_MARK} 4 a.test.ts:17:15 › passes 4`,
+      ];
+      const lines = result.output.split('\n');
+      const firstIndex = lines.indexOf(expected[0]);
+      expect(firstIndex, 'first line should be there').not.toBe(-1);
+      for (let i = 0; i < expected.length; ++i)
+        expect(lines[firstIndex + i]).toContain(expected[i]);
+    });
   });
 }