test(gradientColorStops): ensure opacity variables are generated

__tests__/plugins/gradientColorStops.test.js

@@ -0,0 +1,38 @@
+import postcss from 'postcss'
+import tailwind from '../../src/index'
+
+test('opacity variables are given to colors defined as closures', () => {
+  return postcss([
+    tailwind({
+      theme: {
+        colors: {
+          primary: ({ opacityVariable }) => `rgba(31,31,31,var(${opacityVariable},1))`,
+        },
+      },
+      variants: {
+        gradientColorStops: [],
+      },
+      corePlugins: ['gradientColorStops'],
+    }),
+  ])
+    .process('@tailwind utilities', { from: undefined })
+    .then(result => {
+      const expected = `
+				.from-primary {
+					--gradient-from-color: rgba(31,31,31,var(--gradient-from-opacity,1));
+					--gradient-color-stops: var(--gradient-from-color), var(--gradient-to-color, rgba(255, 255, 255, 0))
+				}
+		
+				.via-primary {
+					--gradient-via-color: rgba(31,31,31,var(--gradient-via-opacity,1));
+					--gradient-color-stops: var(--gradient-from-color), var(--gradient-via-color), var(--gradient-to-color, rgba(255, 255, 255, 0))
+				}
+		
+				.to-primary {
+					--gradient-to-color: rgba(31,31,31,var(--gradient-to-opacity,1))
+				}
+      `
+
+      expect(result.css).toMatchCss(expected)
+    })
+})