class ErrorTest

class ErrorTest extends UnitTestCase {
    
    /**
     * Tests the getLastCaller() method.
     *
     * @param array $backtrace
     *   The test backtrace array.
     * @param array $expected
     *   The expected return array.
     *
     * @dataProvider providerTestGetLastCaller
     */
    public function testGetLastCaller(array $backtrace, array $expected) : void {
        $this->assertSame($expected, Error::getLastCaller($backtrace));
    }
    
    /**
     * Data provider for testGetLastCaller.
     *
     * @return array
     *   An array of parameter data.
     */
    public static function providerTestGetLastCaller() : array {
        $data = [];
        // Test with just one item. This should default to the function being
        // main().
        $single_item = [
            self::createBacktraceItem(),
        ];
        $data[] = [
            $single_item,
            self::createBacktraceItem('main()'),
        ];
        // Add a second item, without a class.
        $two_items = $single_item;
        $two_items[] = self::createBacktraceItem('test_function_two');
        $data[] = [
            $two_items,
            self::createBacktraceItem('test_function_two()'),
        ];
        // Add a second item, with a class.
        $two_items = $single_item;
        $two_items[] = self::createBacktraceItem('test_function_two', 'TestClass');
        $data[] = [
            $two_items,
            self::createBacktraceItem('TestClass->test_function_two()'),
        ];
        // Add ignored functions to backtrace. They should get removed.
        foreach ([
            'debug',
            '_drupal_error_handler',
            '_drupal_exception_handler',
        ] as $function) {
            $two_items = $single_item;
            // Push to the start of the backtrace.
            array_unshift($two_items, self::createBacktraceItem($function));
            $data[] = [
                $single_item,
                self::createBacktraceItem('main()'),
            ];
        }
        return $data;
    }
    
    /**
     * Tests the formatBacktrace() method.
     *
     * @param array $backtrace
     *   The test backtrace array.
     * @param string $expected
     *   The expected backtrace as a string.
     *
     * @dataProvider providerTestFormatBacktrace
     */
    public function testFormatBacktrace(array $backtrace, string $expected) : void {
        $this->assertSame($expected, Error::formatBacktrace($backtrace));
    }
    
    /**
     * Data provider for testFormatBacktrace.
     *
     * @return array
     */
    public static function providerTestFormatBacktrace() : array {
        $data = [];
        // Test with no function, main should be in the backtrace.
        $data[] = [
            [
                self::createBacktraceItem(NULL, NULL),
            ],
            "main() (Line: 10)\n",
        ];
        $base = [
            self::createBacktraceItem(),
        ];
        $data[] = [
            $base,
            "test_function() (Line: 10)\n",
        ];
        // Add a second item.
        $second_item = $base;
        $second_item[] = self::createBacktraceItem('test_function_2');
        $data[] = [
            $second_item,
            "test_function() (Line: 10)\ntest_function_2() (Line: 10)\n",
        ];
        // Add a second item, with a class.
        $second_item_class = $base;
        $second_item_class[] = self::createBacktraceItem('test_function_2', 'TestClass');
        $data[] = [
            $second_item_class,
            "test_function() (Line: 10)\nTestClass->test_function_2() (Line: 10)\n",
        ];
        // Add a second item, with a class.
        $second_item_args = $base;
        $second_item_args[] = self::createBacktraceItem('test_function_2', NULL, [
            'string',
            10,
            new \stdClass(),
        ]);
        $data[] = [
            $second_item_args,
            "test_function() (Line: 10)\ntest_function_2('string', 10, Object) (Line: 10)\n",
        ];
        return $data;
    }
    
    /**
     * Creates a mock backtrace item.
     *
     * @param string|null $function
     *   (optional) The function name to use in the backtrace item.
     * @param string|null $class
     *   (optional) The class to use in the backtrace item.
     * @param array $args
     *   (optional) An array of function arguments to add to the backtrace item.
     * @param int $line
     *   (optional) The line where the function was called.
     *
     * @return array
     *   A backtrace array item.
     */
    protected static function createBacktraceItem(?string $function = 'test_function', ?string $class = NULL, array $args = [], int $line = 10) : array {
        $backtrace = [
            'file' => 'test_file',
            'line' => $line,
            'function' => $function,
            'args' => [],
        ];
        if (isset($class)) {
            $backtrace['class'] = $class;
            $backtrace['type'] = '->';
        }
        if (!empty($args)) {
            $backtrace['args'] = $args;
        }
        return $backtrace;
    }

}