class ImageTest

class ImageTest extends TestCase {
    
    /**
     * Tests all control flow branches in image_dimensions_scale().
     *
     * @dataProvider providerTestScaleDimensions
     */
    public function testScaleDimensions($input, $output) : void {
        // Process the test dataset.
        $return_value = Image::scaleDimensions($input['dimensions'], $input['width'], $input['height'], $input['upscale']);
        // Check the width.
        $this->assertEquals($output['dimensions']['width'], $input['dimensions']['width'], sprintf('Computed width (%s) does not equal expected width (%s)', $output['dimensions']['width'], $input['dimensions']['width']));
        // Check the height.
        $this->assertEquals($output['dimensions']['height'], $input['dimensions']['height'], sprintf('Computed height (%s) does not equal expected height (%s)', $output['dimensions']['height'], $input['dimensions']['height']));
        // Check the return value.
        $this->assertEquals($output['return_value'], $return_value, 'Incorrect return value.');
    }
    
    /**
     * Provides data for image dimension scale tests.
     *
     * @return array
     *   Keyed array containing:
     *   - 'input' - Array which contains input for Image::scaleDimensions().
     *   - 'output' - Array which contains expected output after passing
     *     through Image::scaleDimensions. Also contains a boolean
     *     'return_value' which should match the expected return value.
     *
     * @see testScaleDimensions()
     */
    public static function providerTestScaleDimensions() {
        // Define input / output datasets to test different branch conditions.
        $tests = [];
        // Test branch conditions:
        // - No height.
        // - Upscale, don't need to upscale.
        $tests[] = [
            'input' => [
                'dimensions' => [
                    'width' => 1000,
                    'height' => 2000,
                ],
                'width' => 200,
                'height' => NULL,
                'upscale' => TRUE,
            ],
            'output' => [
                'dimensions' => [
                    'width' => 200,
                    'height' => 400,
                ],
                'return_value' => TRUE,
            ],
        ];
        // Test branch conditions:
        // - No width.
        // - Don't upscale, don't need to upscale.
        $tests[] = [
            'input' => [
                'dimensions' => [
                    'width' => 1000,
                    'height' => 800,
                ],
                'width' => NULL,
                'height' => 140,
                'upscale' => FALSE,
            ],
            'output' => [
                'dimensions' => [
                    'width' => 175,
                    'height' => 140,
                ],
                'return_value' => TRUE,
            ],
        ];
        // Test branch conditions:
        // - Source aspect ratio greater than target.
        // - Upscale, need to upscale.
        $tests[] = [
            'input' => [
                'dimensions' => [
                    'width' => 8,
                    'height' => 20,
                ],
                'width' => 200,
                'height' => 140,
                'upscale' => TRUE,
            ],
            'output' => [
                'dimensions' => [
                    'width' => 56,
                    'height' => 140,
                ],
                'return_value' => TRUE,
            ],
        ];
        // Test branch condition: target aspect ratio greater than source.
        $tests[] = [
            'input' => [
                'dimensions' => [
                    'width' => 2000,
                    'height' => 800,
                ],
                'width' => 200,
                'height' => 140,
                'upscale' => FALSE,
            ],
            'output' => [
                'dimensions' => [
                    'width' => 200,
                    'height' => 80,
                ],
                'return_value' => TRUE,
            ],
        ];
        // Test branch condition: don't upscale, need to upscale.
        $tests[] = [
            'input' => [
                'dimensions' => [
                    'width' => 100,
                    'height' => 50,
                ],
                'width' => 200,
                'height' => 140,
                'upscale' => FALSE,
            ],
            'output' => [
                'dimensions' => [
                    'width' => 100,
                    'height' => 50,
                ],
                'return_value' => FALSE,
            ],
        ];
        return $tests;
    }

}