Risky Test Check for Output Buffering is performed before after-test methods are called

[sebastianbergmann]

Test.php

<?php declare(strict_types=1);
use PHPUnit\Framework\TestCase;

final class Test extends TestCase
{
    public function testOne(): void
    {
        $this->assertTrue(true);
        
        ob_start();
    }

    public function tearDown(): void
    {
        ob_end_clean();
    }
}

Actual

Test Runner Output

phpunit Test.php                    
PHPUnit 10.2.7 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.2.9

R                                                                   1 / 1 (100%)

Time: 00:00.018, Memory: 4.00 MB

There was 1 risky test:

1) Test::testOne
Test code or tested code did not close its own output buffers

/home/sb/Test.php:6

OK, but there are issues!
Tests: 1, Assertions: 1, Notices: 1, Risky: 1.

Event Log

PHPUnit Started (PHPUnit 10.2.7 using PHP 8.2.9 (cli) on Linux)
Test Runner Configured
Test Suite Loaded (1 test)
Event Facade Sealed
Test Runner Started
Test Suite Sorted
Test Runner Execution Started (1 test)
Test Suite Started (Test, 1 test)
Test Preparation Started (Test::testOne)
Test Prepared (Test::testOne)
Assertion Succeeded (Constraint: is true, Value: true)
Test Considered Risky (Test::testOne)
Test code or tested code did not close its own output buffers
Test Triggered PHP Notice (Test::testOne)
ob_end_clean(): Failed to delete buffer. No buffer to delete
After Test Method Called (Test::tearDown)
After Test Method Finished:
- Test::tearDown
Test Finished (Test::testOne)
Test Suite Finished (Test, 1 test)
Test Runner Execution Finished
Test Runner Finished
PHPUnit Finished (Shell Exit Code: 0)

Expected

Test Runner Output

PHPUnit 10.2.7 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.2.9

.                                                                   1 / 1 (100%)

Time: 00:00.011, Memory: 4.00 MB

OK (1 test, 1 assertion)

Event Log

PHPUnit Started (PHPUnit 10.2.7 using PHP 8.2.9 (cli) on Linux)
Test Runner Configured
Test Suite Loaded (1 test)
Event Facade Sealed
Test Runner Started
Test Suite Sorted
Test Runner Execution Started (1 test)
Test Suite Started (Test, 1 test)
Test Preparation Started (Test::testOne)
Test Prepared (Test::testOne)
Assertion Succeeded (Constraint: is true, Value: true)
Test Passed (Test::testOne)
After Test Method Called (Test::tearDown)
After Test Method Finished:
- Test::tearDown
Test Finished (Test::testOne)
Test Suite Finished (Test, 1 test)
Test Runner Execution Finished
Test Runner Finished
PHPUnit Finished (Shell Exit Code: 0)