/', $result);
        $this->assertRegExp('/Notice<\/b>/', $result);
        $this->assertRegExp('/variable:\s+wrong/', $result);
    }

    /**
     * provides errors for mapping tests.
     *
     * @return array
     */
    public static function errorProvider()
    {
        return [
            [E_USER_NOTICE, 'Notice'],
            [E_USER_WARNING, 'Warning'],
        ];
    }

    /**
     * test error mappings
     *
     * @dataProvider errorProvider
     * @return void
     */
    public function testErrorMapping($error, $expected)
    {
        $errorHandler = new ErrorHandler();
        $errorHandler->register();
        $this->_restoreError = true;

        ob_start();
        trigger_error('Test error', $error);
        $result = ob_get_clean();

        $this->assertStringContainsString('' . $expected . '', $result);
    }

    /**
     * test error prepended by @
     *
     * @return void
     */
    public function testErrorSuppressed()
    {
        $errorHandler = new ErrorHandler();
        $errorHandler->register();
        $this->_restoreError = true;

        ob_start();
        // phpcs:disable
        @include 'invalid.file';
        // phpcs:enable
        $result = ob_get_clean();
        $this->assertEmpty($result);
    }

    /**
     * Test that errors go into Cake Log when debug = 0.
     *
     * @return void
     */
    public function testHandleErrorDebugOff()
    {
        Configure::write('debug', false);
        $errorHandler = new ErrorHandler();
        $errorHandler->register();
        $this->_restoreError = true;

        $out = $out + 1;

        $messages = $this->logger->read();
        $this->assertRegExp('/^(notice|debug)/', $messages[0]);
        $this->assertStringContainsString(
            'Notice (8): Undefined variable: out in [' . __FILE__ . ', line ' . (__LINE__ - 5) . ']' . "\n\n",
            $messages[0]
        );
    }

    /**
     * Test that errors going into Cake Log include traces.
     *
     * @return void
     */
    public function testHandleErrorLoggingTrace()
    {
        Configure::write('debug', false);
        $errorHandler = new ErrorHandler(['trace' => true]);
        $errorHandler->register();
        $this->_restoreError = true;

        $out = $out + 1;

        $messages = $this->logger->read();
        $this->assertRegExp('/^(notice|debug)/', $messages[0]);
        $this->assertStringContainsString(
            'Notice (8): Undefined variable: out in [' . __FILE__ . ', line ' . (__LINE__ - 5) . ']',
            $messages[0]
        );
        $this->assertStringContainsString('Trace:', $messages[0]);
        $this->assertStringContainsString(__NAMESPACE__ . '\ErrorHandlerTest::testHandleErrorLoggingTrace()', $messages[0]);
        $this->assertStringContainsString('Request URL:', $messages[0]);
        $this->assertStringContainsString('Referer URL:', $messages[0]);
    }

    /**
     * test handleException generating a page.
     *
     * @return void
     */
    public function testHandleException()
    {
        $error = new NotFoundException('Kaboom!');
        $errorHandler = new TestErrorHandler();

        $errorHandler->handleException($error);
        $this->assertStringContainsString('Kaboom!', (string)$errorHandler->response->getBody(), 'message missing.');
    }

    /**
     * test handleException generating log.
     *
     * @return void
     */
    public function testHandleExceptionLog()
    {
        $errorHandler = new TestErrorHandler([
            'log' => true,
            'trace' => true,
        ]);

        $error = new NotFoundException('Kaboom!');
        $errorHandler->handleException($error);
        $this->assertStringContainsString('Kaboom!', (string)$errorHandler->response->getBody(), 'message missing.');

        $messages = $this->logger->read();
        $this->assertRegExp('/^error/', $messages[0]);
        $this->assertStringContainsString('[Cake\Http\Exception\NotFoundException] Kaboom!', $messages[0]);
        $this->assertStringContainsString(
            str_replace('/', DS, 'vendor/phpunit/phpunit/src/Framework/TestCase.php'),
            $messages[0]
        );

        $errorHandler = new TestErrorHandler([
            'log' => true,
            'trace' => false,
        ]);
        $errorHandler->handleException($error);

        $messages = $this->logger->read();
        $this->assertRegExp('/^error/', $messages[1]);
        $this->assertStringContainsString('[Cake\Http\Exception\NotFoundException] Kaboom!', $messages[1]);
        $this->assertStringNotContainsString(
            str_replace('/', DS, 'vendor/phpunit/phpunit/src/Framework/TestCase.php'), 
            $messages[1]
        );
    }

    /**
     * test logging attributes with/without debug
     *
     * @return void
     */
    public function testHandleExceptionLogAttributes()
    {
        $errorHandler = new TestErrorHandler([
            'log' => true,
            'trace' => true,
        ]);

        $error = new MissingControllerException(['class' => 'Derp']);
        $errorHandler->handleException($error);

        Configure::write('debug', false);
        $errorHandler->handleException($error);

        $messages = $this->logger->read();
        $this->assertRegExp('/^error/', $messages[0]);
        $this->assertStringContainsString(
            '[Cake\Http\Exception\MissingControllerException] Controller class Derp could not be found.',
            $messages[0]
        );
        $this->assertStringContainsString('Exception Attributes:', $messages[0]);
        $this->assertStringContainsString('Request URL:', $messages[0]);
        $this->assertStringContainsString('Referer URL:', $messages[0]);

        $this->assertStringContainsString(
            '[Cake\Http\Exception\MissingControllerException] Controller class Derp could not be found.',
            $messages[1]
        );
        $this->assertStringNotContainsString('Exception Attributes:', $messages[1]);
    }

    /**
     * test logging attributes with previous exception
     *
     * @return void
     */
    public function testHandleExceptionLogPrevious()
    {
        $errorHandler = new TestErrorHandler([
            'log' => true,
            'trace' => true,
        ]);

        $previous = new RecordNotFoundException('Previous logged');
        $error = new NotFoundException('Kaboom!', null, $previous);
        $errorHandler->handleException($error);

        $messages = $this->logger->read();
        $this->assertStringContainsString('[Cake\Http\Exception\NotFoundException] Kaboom!', $messages[0]);
        $this->assertStringContainsString(
            'Caused by: [Cake\Datasource\Exception\RecordNotFoundException] Previous logged',
            $messages[0]
        );
        $this->assertStringContainsString(
            str_replace('/', DS, 'vendor/phpunit/phpunit/src/Framework/TestCase.php'),
            $messages[0]
        );
    }

    /**
     * test handleException generating log.
     *
     * @return void
     */
    public function testHandleExceptionLogSkipping()
    {
        $notFound = new NotFoundException('Kaboom!');
        $forbidden = new ForbiddenException('Fooled you!');
        $errorHandler = new TestErrorHandler([
            'log' => true,
            'skipLog' => ['Cake\Http\Exception\NotFoundException'],
        ]);

        $errorHandler->handleException($notFound);
        $this->assertStringContainsString('Kaboom!', (string)$errorHandler->response->getBody(), 'message missing.');

        $errorHandler->handleException($forbidden);
        $this->assertStringContainsString('Fooled you!', (string)$errorHandler->response->getBody(), 'message missing.');

        $messages = $this->logger->read();
        $this->assertCount(1, $messages);
        $this->assertRegExp('/^error/', $messages[0]);
        $this->assertStringContainsString(
            '[Cake\Http\Exception\ForbiddenException] Fooled you!',
            $messages[0]
        );
    }

    /**
     * tests it is possible to load a plugin exception renderer
     *
     * @return void
     */
    public function testLoadPluginHandler()
    {
        $this->loadPlugins(['TestPlugin']);
        $errorHandler = new TestErrorHandler([
            'exceptionRenderer' => 'TestPlugin.TestPluginExceptionRenderer',
        ]);

        $error = new NotFoundException('Kaboom!');
        $errorHandler->handleException($error);

        $result = $errorHandler->response;
        $this->assertSame('Rendered by test plugin', (string)$result);
    }

    /**
     * test handleFatalError generating a page.
     *
     * These tests start two buffers as handleFatalError blows the outer one up.
     *
     * @return void
     */
    public function testHandleFatalErrorPage()
    {
        $line = __LINE__;
        $errorHandler = new TestErrorHandler();
        Configure::write('debug', true);

        $errorHandler->handleFatalError(E_ERROR, 'Something wrong', __FILE__, $line);
        $result = (string)$errorHandler->response->getBody();
        $this->assertStringContainsString('Something wrong', $result, 'message missing.');
        $this->assertStringContainsString(__FILE__, $result, 'filename missing.');
        $this->assertStringContainsString((string)$line, $result, 'line missing.');

        Configure::write('debug', false);
        $errorHandler->handleFatalError(E_ERROR, 'Something wrong', __FILE__, $line);
        $result = (string)$errorHandler->response->getBody();
        $this->assertStringNotContainsString('Something wrong', $result, 'message must not appear.');
        $this->assertStringNotContainsString(__FILE__, $result, 'filename must not appear.');
        $this->assertStringContainsString('An Internal Error Has Occurred.', $result);
    }

    /**
     * test handleFatalError generating log.
     *
     * @return void
     */
    public function testHandleFatalErrorLog()
    {
        $errorHandler = new TestErrorHandler(['log' => true]);
        $errorHandler->handleFatalError(E_ERROR, 'Something wrong', __FILE__, __LINE__);

        $messages = $this->logger->read();
        $this->assertCount(2, $messages);
        $this->assertStringContainsString(__FILE__ . ', line ' . (__LINE__ - 4), $messages[0]);
        $this->assertStringContainsString('Fatal Error (1)', $messages[0]);
        $this->assertStringContainsString('Something wrong', $messages[0]);
        $this->assertStringContainsString('[Cake\Error\FatalErrorException] Something wrong', $messages[1]);
    }

    /**
     * Data provider for memory limit changing.
     *
     * @return array
     */
    public function memoryLimitProvider()
    {
        return [
            // start, adjust, expected
            ['256M', 4, '262148K'],
            ['262144K', 4, '262148K'],
            ['1G', 128, '1048704K'],
        ];
    }

    /**
     * Test increasing the memory limit.
     *
     * @dataProvider memoryLimitProvider
     * @return void
     */
    public function testIncreaseMemoryLimit($start, $adjust, $expected)
    {
        $initial = ini_get('memory_limit');
        $this->skipIf(strlen($initial) === 0, 'Cannot read memory limit, and cannot test increasing it.');

        // phpunit.xml often has -1 as memory limit
        ini_set('memory_limit', $start);

        $errorHandler = new TestErrorHandler();
        $this->assertNull($errorHandler->increaseMemoryLimit($adjust));
        $new = ini_get('memory_limit');
        $this->assertEquals($expected, $new, 'memory limit did not get increased.');

        ini_set('memory_limit', $initial);
    }
}