diff --git a/test/classes/gis/GISGeometrycollectionTest.php b/test/classes/gis/GISGeometrycollectionTest.php
index cf403d4a22..b940685209 100644
--- a/test/classes/gis/GISGeometrycollectionTest.php
+++ b/test/classes/gis/GISGeometrycollectionTest.php
@@ -208,6 +208,9 @@ class GISGeometryCollectionTest extends PHPUnit_Framework_TestCase
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'GEOMETRYCOLLECTION(POLYGON((35 10,10 20,15 40,45 45,35 10),'
diff --git a/test/classes/gis/GISLinestringTest.php b/test/classes/gis/GISLinestringTest.php
index 8d927f8db3..c65a62890f 100644
--- a/test/classes/gis/GISLinestringTest.php
+++ b/test/classes/gis/GISLinestringTest.php
@@ -192,6 +192,9 @@ class GISLinestringTest extends GISGeomTest
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'LINESTRING(12 35,48 75,69 23,25 45,14 53,35 78)',
diff --git a/test/classes/gis/GISMultilinestringTest.php b/test/classes/gis/GISMultilinestringTest.php
index b3d7ff52ad..b69c724dbc 100644
--- a/test/classes/gis/GISMultilinestringTest.php
+++ b/test/classes/gis/GISMultilinestringTest.php
@@ -253,6 +253,9 @@ class GISMultilinestringTest extends GISGeomTest
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'MULTILINESTRING((36 14,47 23,62 75),(36 10,17 23,178 53))',
diff --git a/test/classes/gis/GISMultipointTest.php b/test/classes/gis/GISMultipointTest.php
index af8086a1a2..bac4b8eeba 100644
--- a/test/classes/gis/GISMultipointTest.php
+++ b/test/classes/gis/GISMultipointTest.php
@@ -196,6 +196,9 @@ class GISMultipointTest extends GISGeomTest
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'MULTIPOINT(12 35,48 75,69 23,25 45,14 53,35 78)',
diff --git a/test/classes/gis/GISMultipolygonTest.php b/test/classes/gis/GISMultipolygonTest.php
index c1ea48bd31..c6a24374e8 100644
--- a/test/classes/gis/GISMultipolygonTest.php
+++ b/test/classes/gis/GISMultipolygonTest.php
@@ -296,6 +296,9 @@ class GISMultipolygonTest extends GISGeomTest
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'MULTIPOLYGON(((136 40,147 83,16 75,136 40)),'
diff --git a/test/classes/gis/GISPointTest.php b/test/classes/gis/GISPointTest.php
index 27f036203f..bc9dfd39c8 100644
--- a/test/classes/gis/GISPointTest.php
+++ b/test/classes/gis/GISPointTest.php
@@ -197,6 +197,9 @@ class GISPointTest extends GISGeomTest
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'POINT(12 35)',
diff --git a/test/classes/gis/GISPolygonTest.php b/test/classes/gis/GISPolygonTest.php
index d2be8fb962..a9fad0a5a6 100644
--- a/test/classes/gis/GISPolygonTest.php
+++ b/test/classes/gis/GISPolygonTest.php
@@ -384,6 +384,9 @@ class GISPolygonTest extends GISGeomTest
      */
     public function providerForPrepareRowAsPng()
     {
+        if (! function_exists('imagecreatetruecolor')) {
+            $this->markTestSkipped('GD extension missing!');
+        }
         return array(
             array(
                 'POLYGON((123 0,23 30,17 63,123 0))',
diff --git a/test/classes/plugin/transformations/TransformationPluginsTest.php b/test/classes/plugin/transformations/TransformationPluginsTest.php
index bceacfd97a..2ef7678d7d 100644
--- a/test/classes/plugin/transformations/TransformationPluginsTest.php
+++ b/test/classes/plugin/transformations/TransformationPluginsTest.php
@@ -690,7 +690,7 @@ class TransformationPluginsTest extends PMATestCase
      */
     public function transformationDataProvider()
     {
-        return array(
+        $result = array(
             array(
                 new Image_JPEG_Upload(),
                 array(
@@ -771,17 +771,6 @@ class TransformationPluginsTest extends PMATestCase
                 ),
                 '31 31 31 31 31 30 30 31 '
             ),
-            array(
-                new Image_JPEG_Inline(),
-                array(
-                    'PMA_JPEG_Inline',
-                    array("./image/", "200", "wrapper_link"=>"PMA_wrapper_link")
-                ),
-                '<a href="transformation_wrapper.phpPMA_wrapper_link" '
-                . 'rel="noopener noreferrer" target="_blank"><img src="transformation_wrapper.php'
-                . 'PMA_wrapper_link&amp;resize=jpeg&amp;newWidth=0&amp;'
-                . 'newHeight=200" alt="[PMA_JPEG_Inline]" border="0" /></a>'
-            ),
             array(
                 new Image_JPEG_Link(),
                 array(
@@ -792,18 +781,6 @@ class TransformationPluginsTest extends PMATestCase
                 . ' href="transformation_wrapper.phpPMA_wrapper_link"'
                 . ' alt="[PMA_IMAGE_LINK]">[BLOB]</a>'
             ),
-            array(
-                new Image_PNG_Inline(),
-                array(
-                    'PMA_PNG_Inline',
-                    array("./image/", "200", "wrapper_link"=>"PMA_wrapper_link")
-                ),
-                '<a href="transformation_wrapper.phpPMA_wrapper_link"'
-                . ' rel="noopener noreferrer" target="_blank"><img src="transformation_wrapper.php'
-                . 'PMA_wrapper_link&amp;'
-                . 'resize=jpeg&amp;newWidth=0&amp;newHeight=200" '
-                . 'alt="[PMA_PNG_Inline]" border="0" /></a>'
-            ),
             array(
                 new Text_Plain_Dateformat(),
                 array(
@@ -970,6 +947,33 @@ class TransformationPluginsTest extends PMATestCase
                 'suffixMA_suffix'
             ),
         );
+
+        if (function_exists('imagecreatetruecolor')) {
+            $result[] = array(
+                new Image_JPEG_Inline(),
+                array(
+                    'PMA_JPEG_Inline',
+                    array("./image/", "200", "wrapper_link"=>"PMA_wrapper_link")
+                ),
+                '<a href="transformation_wrapper.phpPMA_wrapper_link" '
+                . 'rel="noopener noreferrer" target="_blank"><img src="transformation_wrapper.php'
+                . 'PMA_wrapper_link&amp;resize=jpeg&amp;newWidth=0&amp;'
+                . 'newHeight=200" alt="[PMA_JPEG_Inline]" border="0" /></a>'
+            );
+            $result[] = array(
+                new Image_PNG_Inline(),
+                array(
+                    'PMA_PNG_Inline',
+                    array("./image/", "200", "wrapper_link"=>"PMA_wrapper_link")
+                ),
+                '<a href="transformation_wrapper.phpPMA_wrapper_link"'
+                . ' rel="noopener noreferrer" target="_blank"><img src="transformation_wrapper.php'
+                . 'PMA_wrapper_link&amp;'
+                . 'resize=jpeg&amp;newWidth=0&amp;newHeight=200" '
+                . 'alt="[PMA_PNG_Inline]" border="0" /></a>'
+            );
+        }
+        return $result;
     }
 
     /**