Bug 1900530 - Update existing testcases now that a single-stop gradient is valid. r=layout-reviewers,emilio

Differential Revision: https://phabricator.services.mozilla.com/D233219

layout/reftests/css-gradients/onestop-ref.html

@@ -0,0 +1 @@
+<div style="background: blue; width: 300px; height: 300px;"><br></div>

layout/reftests/css-gradients/reftest.list

@@ -31,7 +31,7 @@ fuzzy(0-3,0-89700) == linear-vertical-1d.html linear-vertical-1-ref.html
 fuzzy(0-3,0-21070) == linear-vertical-subpixel-1.html linear-vertical-subpixel-1-ref.html
 == linear-viewport.html linear-viewport-ref.html
 == nostops.html about:blank
-== onestop.html about:blank
+== onestop.html onestop-ref.html
 random-if(winWidget) fuzzy(0-4,0-6000) == radial-1a.html radial-1-ref.html
 random-if(winWidget) fuzzy(0-4,0-6000) == radial-1b.html radial-1-ref.html
 fuzzy(0-3,0-7860) fuzzy-if(cocoaWidget,0-5,0-89041) == radial-2a.html radial-2-ref.html

testing/web-platform/tests/css/css-images/gradient/color-stops-parsing.html

@@ -13,8 +13,6 @@
                 var tests = [
                         // invalid stops
                         { stops: ""                        , parse: false },
-                        { stops: "black"                   , parse: false },
-                        { stops: "black 0%"                , parse: false },
                         { stops: "black, 25%"              , parse: false },
                         { stops: "black, invalid"          , parse: false },
                         { stops: "black, , white"          , parse: false },
@@ -26,6 +24,8 @@
                         { stops: "0%, black, white"        , parse: false },
 
                         // basic stops
+                        { stops: "black"                           , parse: true },
+                        { stops: "black 0%"                        , parse: true },
                         { stops: "black, white"                    , parse: true },
                         { stops: "black 0, white"                  , parse: true },
                         { stops: "black 0%, white"                 , parse: true },

testing/web-platform/tests/css/css-images/image-set/image-set-parsing.html

@@ -221,15 +221,15 @@ function test_gradient_images_parsing() {
     'content',
     'image-set(url("example.png") 192dpi, linear-gradient(black, white) 1x)'
   );
+  test_valid_value_variants(
+    'background-image',
+    "image-set(linear-gradient(red) 1x)"
+  );
 
   test_invalid_value_variants(
     'cursor',
     "image-set(linear-gradient(black, white) 1x)"
   );
-  test_invalid_value_variants(
-    'background-image',
-    "image-set(linear-gradient(red) 1x)"
-  );
 }
 
 function test_image_type_parsing() {