Ticket #23039: wp-image-editor-gd-tests.diff

tests/image/base.php

@@ -30 +30 @@
         public function setEngine( $editors ) {
                 return array( $this->editor_engine );
         }
+
+        /**
+         * Helper assertion for testing alpha on images
+         * 
+         * @param  string $image_path
+         * @param  array $point      array(x,y)
+         * @param  int $alpha
+         */
+        protected function assertImageAlphaAtPoint( $image_path, $point, $alpha ) {
+
+                $im = imagecreatefrompng( $image_path );
+                $rgb = imagecolorat($im, $point[0], $point[1]);
+
+                $colors = imagecolorsforindex($im, $rgb);
+
+                $this->assertEquals( $alpha, $colors['alpha'] );
+        }
 }

tests/image/editor_gd.php

@@ +1 @@
+<?php
+
+/**
+ * Test the WP_Image_Editor_GD class
+ * @group image
+ * @group media
+ */
+
+/**
+ * @todo how does one run this test on it's own without including the parent class?
+ */
+require_once( 'base.php' );
+
+class Tests_Image_Editor_GD extends WP_Image_UnitTestCase {
+        public $editor_engine = 'WP_Image_Editor_GD';
+
+        public function setup() {
+                require_once( ABSPATH . WPINC . '/class-wp-image-editor.php' );
+                require_once( ABSPATH . WPINC . '/class-wp-image-editor-gd.php' );
+                parent::setUp();
+        }
+
+        public function test_image_preserves_alpha_on_resize() {
+
+                $file = DIR_TESTDATA . '/images/transparent.png';
+
+                $editor = wp_get_image_editor( $file );
+                $editor->load();
+                $editor->resize(5,5);
+                $save_to_file = tempnam( get_temp_dir(), '' ) . '.png';
+                
+                $editor->save( $save_to_file );
+
+                $this->assertImageAlphaAtPoint( $save_to_file, array( 0,0 ), 127 );
+
+        }
+        
+        /**
+         * Test the image created with WP_Image_Edior_GD preserves alpha with no resizing etc
+         * 
+         * 
+         */
+        public function test_image_preserves_alpha() {
+
+                $file = DIR_TESTDATA . '/images/transparent.png';
+
+                $editor = wp_get_image_editor( $file );
+                $editor->load();
+
+                $save_to_file = tempnam( get_temp_dir(), '' ) . '.png';
+                
+                $editor->save( $save_to_file );
+
+                $this->assertImageAlphaAtPoint( $save_to_file, array( 0,0 ), 127 );
+        }
+
+}