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diff --git a/tests/phpunit/mocks/media/MockBitmapHandler.php b/tests/phpunit/mocks/media/MockBitmapHandler.php
new file mode 100644
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+++ b/tests/phpunit/mocks/media/MockBitmapHandler.php
@@ -0,0 +1,92 @@
+<?php
+/**
+ * Fake handler for images.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Media
+ */
+
+class MockBitmapHandler extends BitmapHandler {
+	function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
+		return MockImageHandler::doFakeTransform( $this, $image, $dstPath, $dstUrl, $params, $flags );
+	}
+	function doClientImage( $image, $scalerParams ) {
+			return $this->getClientScalingThumbnailImage( $image, $scalerParams );
+	}
+}
+class MockSvgHandler extends SvgHandler {
+	function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
+		return MockImageHandler::doFakeTransform( $this, $image, $dstPath, $dstUrl, $params, $flags );
+	}
+}
+/**
+ * Mock handler for images.
+ *
+ * This is really intended for unit testing.
+ *
+ * @ingroup Media
+ */
+class MockImageHandler {
+
+	/**
+	 * Override BitmapHandler::doTransform() making sure we do not generate
+	 * a thumbnail at all. That is merely returning a ThumbnailImage that
+	 * will be consumed by the unit test.  There is no need to create a real
+	 * thumbnail on the filesystem.
+	 */
+	static function doFakeTransform( $that, $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
+		# Example of what we receive:
+		# $image: LocalFile
+		# $dstPath: /tmp/transform_7d0a7a2f1a09-1.jpg
+		# $dstUrl : http://example.com/images/thumb/0/09/Bad.jpg/320px-Bad.jpg
+		# $params:  width: 320,  descriptionUrl http://trunk.dev/wiki/File:Bad.jpg
+
+		$that->normaliseParams( $image, $params );
+
+		$scalerParams = array(
+			# The size to which the image will be resized
+			'physicalWidth' => $params['physicalWidth'],
+			'physicalHeight' => $params['physicalHeight'],
+			'physicalDimensions' => "{$params['physicalWidth']}x{$params['physicalHeight']}",
+			# The size of the image on the page
+			'clientWidth' => $params['width'],
+			'clientHeight' => $params['height'],
+			# Comment as will be added to the EXIF of the thumbnail
+			'comment' => isset( $params['descriptionUrl'] ) ?
+			"File source: {$params['descriptionUrl']}" : '',
+			# Properties of the original image
+			'srcWidth' => $image->getWidth(),
+			'srcHeight' => $image->getHeight(),
+			'mimeType' => $image->getMimeType(),
+			'dstPath' => $dstPath,
+			'dstUrl' => $dstUrl,
+		);
+
+		# In some cases, we do not bother generating a thumbnail.
+		if ( !$image->mustRender() &&
+			$scalerParams['physicalWidth'] == $scalerParams['srcWidth']
+			&& $scalerParams['physicalHeight'] == $scalerParams['srcHeight']
+		) {
+			wfDebug( __METHOD__ . ": returning unscaled image\n" );
+			// getClientScalingThumbnailImage is protected
+			return $that->doClientImage( $image, $scalerParams );
+		}
+
+		return new ThumbnailImage( $image, $dstUrl, false, $params );
+	}
+}