1 files changed, 155 insertions, 0 deletions
diff --git a/tests/phpunit/includes/media/PNGMetadataExtractorTest.php b/tests/phpunit/includes/media/PNGMetadataExtractorTest.php
new file mode 100644
index 00000000..939f2cfc
--- /dev/null
+++ b/tests/phpunit/includes/media/PNGMetadataExtractorTest.php
@@ -0,0 +1,155 @@
+<?php
+
+/**
+ * @todo covers tags
+ */
+class PNGMetadataExtractorTest extends MediaWikiTestCase {
+
+	protected function setUp() {
+		parent::setUp();
+		$this->filePath = __DIR__ . '/../../data/media/';
+	}
+
+	/**
+	 * Tests zTXt tag (compressed textual metadata)
+	 */
+	public function testPngNativetZtxt() {
+		$this->checkPHPExtension( 'zlib' );
+
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+		$expected = "foo bar baz foo foo foo foof foo foo foo foo";
+		$this->assertArrayHasKey( 'text', $meta );
+		$meta = $meta['text'];
+		$this->assertArrayHasKey( 'Make', $meta );
+		$this->assertArrayHasKey( 'x-default', $meta['Make'] );
+
+		$this->assertEquals( $expected, $meta['Make']['x-default'] );
+	}
+
+	/**
+	 * Test tEXt tag (Uncompressed textual metadata)
+	 */
+	public function testPngNativeText() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+		$expected = "Some long image desc";
+		$this->assertArrayHasKey( 'text', $meta );
+		$meta = $meta['text'];
+		$this->assertArrayHasKey( 'ImageDescription', $meta );
+		$this->assertArrayHasKey( 'x-default', $meta['ImageDescription'] );
+		$this->assertArrayHasKey( '_type', $meta['ImageDescription'] );
+
+		$this->assertEquals( $expected, $meta['ImageDescription']['x-default'] );
+	}
+
+	/**
+	 * tEXt tags must be encoded iso-8859-1 (vs iTXt which are utf-8)
+	 * Make sure non-ascii characters get converted properly
+	 */
+	public function testPngNativeTextNonAscii() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+
+		// Note the Copyright symbol here is a utf-8 one
+		// (aka \xC2\xA9) where in the file its iso-8859-1
+		// encoded as just \xA9.
+		$expected = "© 2010 Bawolff";
+
+		$this->assertArrayHasKey( 'text', $meta );
+		$meta = $meta['text'];
+		$this->assertArrayHasKey( 'Copyright', $meta );
+		$this->assertArrayHasKey( 'x-default', $meta['Copyright'] );
+
+		$this->assertEquals( $expected, $meta['Copyright']['x-default'] );
+	}
+
+	/**
+	 * Test extraction of pHYs tags, which can tell what the
+	 * actual resolution of the image is (aka in dots per meter).
+	 */
+	/*
+	public function testPngPhysTag() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+
+		$this->assertArrayHasKey( 'text', $meta );
+		$meta = $meta['text'];
+
+		$this->assertEquals( '2835/100', $meta['XResolution'] );
+		$this->assertEquals( '2835/100', $meta['YResolution'] );
+		$this->assertEquals( 3, $meta['ResolutionUnit'] ); // 3 = cm
+	}
+	*/
+
+	/**
+	 * Given a normal static PNG, check the animation metadata returned.
+	 */
+	public function testStaticPngAnimationMetadata() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+
+		$this->assertEquals( 0, $meta['frameCount'] );
+		$this->assertEquals( 1, $meta['loopCount'] );
+		$this->assertEquals( 0, $meta['duration'] );
+	}
+
+	/**
+	 * Given an animated APNG image file
+	 * check it gets animated metadata right.
+	 */
+	public function testApngAnimationMetadata() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Animated_PNG_example_bouncing_beach_ball.png' );
+
+		$this->assertEquals( 20, $meta['frameCount'] );
+		// Note loop count of 0 = infinity
+		$this->assertEquals( 0, $meta['loopCount'] );
+		$this->assertEquals( 1.5, $meta['duration'], '', 0.00001 );
+	}
+
+	public function testPngBitDepth8() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+
+		$this->assertEquals( 8, $meta['bitDepth'] );
+	}
+
+	public function testPngBitDepth1() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'1bit-png.png' );
+		$this->assertEquals( 1, $meta['bitDepth'] );
+	}
+
+
+	public function testPngIndexColour() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'Png-native-test.png' );
+
+		$this->assertEquals( 'index-coloured', $meta['colorType'] );
+	}
+
+	public function testPngRgbColour() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'rgb-png.png' );
+		$this->assertEquals( 'truecolour-alpha', $meta['colorType'] );
+	}
+
+	public function testPngRgbNoAlphaColour() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'rgb-na-png.png' );
+		$this->assertEquals( 'truecolour', $meta['colorType'] );
+	}
+
+	public function testPngGreyscaleColour() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'greyscale-png.png' );
+		$this->assertEquals( 'greyscale-alpha', $meta['colorType'] );
+	}
+
+	public function testPngGreyscaleNoAlphaColour() {
+		$meta = PNGMetadataExtractor::getMetadata( $this->filePath .
+			'greyscale-na-png.png' );
+		$this->assertEquals( 'greyscale', $meta['colorType'] );
+	}
+}