add simple test to proof that .group-[:hover] works for example

tests/match-variants.test.js

@@ -130,3 +130,27 @@ test('matched variant values maintain the sort order they are registered in', ()
     `)
   })
 })
+
+test('arbitrary matched variants work', () => {
+  let config = {
+    content: [
+      {
+        raw: html`<div class="group-[:hover]:underline"></div>`,
+      },
+    ],
+    corePlugins: { preflight: false },
+    plugins: [],
+  }
+
+  let input = css`
+    @tailwind utilities;
+  `
+
+  return run(input, config).then((result) => {
+    expect(result.css).toMatchFormattedCss(css`
+      .group:hover .group-\[\:hover\]\:underline {
+        text-decoration-line: underline;
+      }
+    `)
+  })
+})