assertTrue($result); $this->assertFileExists(self::CUSTOM_FILE_PATH); $this->assertRegExp( '/^2[0-9]{3}-[0-9]+-[0-9]+ [0-9]+:[0-9]+:[0-9]+ Debug: It works!/', file_get_contents(self::CUSTOM_FILE_PATH) ); unlink(self::CUSTOM_FILE_PATH); } }