diff --git a/tests/phpunit/tests/image/size.php b/tests/phpunit/tests/image/size.php
index a55545ced6..da50606082 100644
--- a/tests/phpunit/tests/image/size.php
+++ b/tests/phpunit/tests/image/size.php
@@ -6,6 +6,28 @@
  * @group upload
  */
 class Tests_Image_Size extends WP_UnitTestCase {
+	function setUp() {
+		parent::setUp();
+
+		add_action( 'deprecated_function_run', array( $this, 'deprecated_function_run_check' ) );
+	}
+
+	function tearDown() {
+		parent::tearDown();
+
+		remove_action( 'deprecated_function_run', array( $this, 'deprecated_function_run_check' ) );
+	}
+
+	function deprecated_function_run_check( $function ) {
+		if ( in_array( $function, array( 'wp_shrink_dimensions' ) ) )
+			add_filter( 'deprecated_function_trigger_error', array( $this, 'filter_deprecated_function_trigger_error' ) );
+	}
+
+	function filter_deprecated_function_trigger_error() {
+		remove_filter( 'deprecated_function_trigger_error', array( $this, 'filter_deprecated_function_trigger_error' ) );
+		return false;
+	}
+
 	function test_constrain_dims_zero() {
 		if (!is_callable('wp_constrain_dimensions'))
 			$this->markTestSkipped('wp_constrain_dimensions() is not callable.');