diff --git a/worker/test/resource/test.webp b/worker/test/resource/test.webp
new file mode 100644
index 0000000..4308530
Binary files /dev/null and b/worker/test/resource/test.webp differ
diff --git a/worker/test/services/image_test.go b/worker/test/services/image_test.go
index 1022312..4fe8e88 100644
--- a/worker/test/services/image_test.go
+++ b/worker/test/services/image_test.go
@@ -73,6 +73,8 @@ func TestConvertImageWithMagickA2B(t *testing.T) {
 		{"png", "jpg"},
 		{"jpg", "webp"},
 		{"png", "webp"},
+		{"webp", "jpg"},
+		{"webp", "png"},
 	}
 	_, self, _, _ := runtime.Caller(0)
 	for _, test := range testList {