diff --git a/tests/phpunit/tests/image/intermediateSize.php b/tests/phpunit/tests/image/intermediateSize.php
index c2ac785058..6b7427c8fa 100644
--- a/tests/phpunit/tests/image/intermediateSize.php
+++ b/tests/phpunit/tests/image/intermediateSize.php
@@ -69,6 +69,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 17626
 	 */
 	function test_get_intermediate_sizes_by_name() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		add_image_size( 'test-size', 330, 220, true );
 
 		$file = DIR_TESTDATA . '/images/waffles.jpg';
@@ -89,6 +93,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 17626
 	 */
 	function test_get_intermediate_sizes_by_array_exact() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		// Only one dimention match shouldn't return false positive (see: #17626).
 		add_image_size( 'test-size', 330, 220, true );
 		add_image_size( 'false-height', 330, 400, true );
@@ -110,6 +118,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 17626
 	 */
 	function test_get_intermediate_sizes_by_array_nearest() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		// If an exact size is not found, it should be returned.
 		// If not, find nearest size that is larger (see: #17626).
 		add_image_size( 'test-size', 450, 300, true );
@@ -153,6 +165,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 17626
 	 */
 	function test_get_intermediate_sizes_by_array_zero_height() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		// Generate random width.
 		$random_w = rand( 300, 400 );
 
@@ -181,6 +197,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 34087
 	 */
 	function test_get_intermediate_sizes_by_array_zero_width() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		// 202 is the smallest height that will trigger a miss for 'false-height'.
 		$height = 202;
 
@@ -209,6 +229,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 34087
 	 */
 	public function test_get_intermediate_sizes_should_match_size_with_off_by_one_aspect_ratio() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		// Original is 600x400. 300x201 is close enough to match.
 		$width  = 300;
 		$height = 201;
@@ -232,6 +256,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 34384
 	 */
 	public function test_get_intermediate_size_with_small_size_array() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		// Add a hard cropped size that matches the aspect ratio we're going to test.
 		add_image_size( 'test-size', 200, 100, true );
 
@@ -249,6 +277,10 @@ class Tests_Image_Intermediate_Size extends WP_UnitTestCase {
 	 * @ticket 34384
 	 */
 	public function test_get_intermediate_size_with_small_size_array_fallback() {
+		if ( ! function_exists( 'imagejpeg' ) ) {
+			$this->fail( 'jpeg support unavailable' );
+		}
+
 		$file = DIR_TESTDATA . '/images/waffles.jpg';
 		$id   = $this->_make_attachment( $file, 0 );