function test__invalid_image_file_synchronous()
{
$sources = array(AMP_IMG_DIMENSION_TEST_INVALID_FILE => false);
$expected = array(AMP_IMG_DIMENSION_TEST_INVALID_FILE => false);
$dimensions = AMP_Image_Dimension_Extractor::extract_by_downloading_images($sources, 'synchronous');
$this->assertEquals($expected, $dimensions);
}