class ImageDimensionsScaleTestCase

class ImageDimensionsScaleTestCase extends DrupalUnitTestCase {
    public static function getInfo() {
        return array(
            'name' => 'image_dimensions_scale()',
            'description' => 'Tests all control flow branches in image_dimensions_scale().',
            'group' => 'Image',
        );
    }
    
    /**
     * Tests all control flow branches in image_dimensions_scale().
     */
    function testImageDimensionsScale() {
        // Define input / output datasets to test different branch conditions.
        $test = array();
        // Test branch conditions:
        // - No height.
        // - Upscale, don't need to upscale.
        $tests[] = array(
            'input' => array(
                'dimensions' => array(
                    'width' => 1000,
                    'height' => 2000,
                ),
                'width' => 200,
                'height' => NULL,
                'upscale' => TRUE,
            ),
            'output' => array(
                'dimensions' => array(
                    'width' => 200,
                    'height' => 400,
                ),
                'return_value' => TRUE,
            ),
        );
        // Test branch conditions:
        // - No width.
        // - Don't upscale, don't need to upscale.
        $tests[] = array(
            'input' => array(
                'dimensions' => array(
                    'width' => 1000,
                    'height' => 800,
                ),
                'width' => NULL,
                'height' => 140,
                'upscale' => FALSE,
            ),
            'output' => array(
                'dimensions' => array(
                    'width' => 175,
                    'height' => 140,
                ),
                'return_value' => TRUE,
            ),
        );
        // Test branch conditions:
        // - Source aspect ratio greater than target.
        // - Upscale, need to upscale.
        $tests[] = array(
            'input' => array(
                'dimensions' => array(
                    'width' => 8,
                    'height' => 20,
                ),
                'width' => 200,
                'height' => 140,
                'upscale' => TRUE,
            ),
            'output' => array(
                'dimensions' => array(
                    'width' => 56,
                    'height' => 140,
                ),
                'return_value' => TRUE,
            ),
        );
        // Test branch condition: target aspect ratio greater than source.
        $tests[] = array(
            'input' => array(
                'dimensions' => array(
                    'width' => 2000,
                    'height' => 800,
                ),
                'width' => 200,
                'height' => 140,
                'upscale' => FALSE,
            ),
            'output' => array(
                'dimensions' => array(
                    'width' => 200,
                    'height' => 80,
                ),
                'return_value' => TRUE,
            ),
        );
        // Test branch condition: don't upscale, need to upscale.
        $tests[] = array(
            'input' => array(
                'dimensions' => array(
                    'width' => 100,
                    'height' => 50,
                ),
                'width' => 200,
                'height' => 140,
                'upscale' => FALSE,
            ),
            'output' => array(
                'dimensions' => array(
                    'width' => 100,
                    'height' => 50,
                ),
                'return_value' => FALSE,
            ),
        );
        foreach ($tests as $test) {
            // Process the test dataset.
            $return_value = image_dimensions_scale($test['input']['dimensions'], $test['input']['width'], $test['input']['height'], $test['input']['upscale']);
            // Check the width.
            $this->assertEqual($test['output']['dimensions']['width'], $test['input']['dimensions']['width'], format_string('Computed width (@computed_width) equals expected width (@expected_width)', array(
                '@computed_width' => $test['output']['dimensions']['width'],
                '@expected_width' => $test['input']['dimensions']['width'],
            )));
            // Check the height.
            $this->assertEqual($test['output']['dimensions']['height'], $test['input']['dimensions']['height'], format_string('Computed height (@computed_height) equals expected height (@expected_height)', array(
                '@computed_height' => $test['output']['dimensions']['height'],
                '@expected_height' => $test['input']['dimensions']['height'],
            )));
            // Check the return value.
            $this->assertEqual($test['output']['return_value'], $return_value, 'Correct return value.');
        }
    }

}