Symfony\Component\Filesystem\Tests\FilesystemTest::testTempnamOnUnwritableFallsBackToSysTmp PHP Method

    public function testTempnamOnUnwritableFallsBackToSysTmp()
    {
        $scheme = 'file://';
        $dirname = $scheme . $this->workspace . DIRECTORY_SEPARATOR . 'does_not_exist';
        $filename = $this->filesystem->tempnam($dirname, 'bar');
        $realTempDir = realpath(sys_get_temp_dir());
        $this->assertStringStartsWith(rtrim($scheme . $realTempDir, DIRECTORY_SEPARATOR), $filename);
        $this->assertFileExists($filename);
        // Tear down
        @unlink($filename);
    }