diff --git a/vips/image_golden_test.go b/vips/image_golden_test.go
index 315c7b98..12d2cd63 100644
--- a/vips/image_golden_test.go
+++ b/vips/image_golden_test.go
@@ -637,26 +637,6 @@ func TestImage_QuantTable(t *testing.T) {
 		nil, ep)
 }
 
-func TestImage_animationGIF(t *testing.T) {
-	ep := &ExportParams{
-		Format:  ImageTypeGIF,
-		Quality: 75,
-	}
-	goldenTest(t, resources+"gif-animated.gif",
-		func(img *ImageRef) error { return nil },
-		nil, ep)
-}
-
-func TestImage_animationWebP(t *testing.T) {
-	ep := &ExportParams{
-		Format:  ImageTypeWEBP,
-		Quality: 75,
-	}
-	goldenTest(t, resources+"webp-animated.webp",
-		func(img *ImageRef) error { return nil },
-		nil, ep)
-}
-
 func goldenTest(t *testing.T, file string, exec func(img *ImageRef) error, validate func(img *ImageRef), params *ExportParams) []byte {
 	Startup(nil)
 
diff --git a/vips/image_test.go b/vips/image_test.go
index 895c40ea..0527b375 100644
--- a/vips/image_test.go
+++ b/vips/image_test.go
@@ -690,6 +690,7 @@ func TestToBytes(t *testing.T) {
 	require.NoError(t, err)
 
 	buf1, err := image.ToBytes()
+	assert.NoError(t, err)
 	assert.Equal(t, 6220800, len(buf1))
 }