test: add inline snapshot tests for react (#5217)

examples/react-testing-lib/src/components/Spinner.test.tsx

@@ -0,0 +1,36 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+import { Spinner } from './Spinner.js'
+
+test('Spinner renders correctly', () => {
+  const { container } = render(
+    <Spinner />,
+  )
+  expect(container).toMatchInlineSnapshot(`
+    <div>
+      <svg
+        class="currentColor -ml-1 mr-3 h-5 w-5 animate-spin"
+        fill="none"
+        viewBox="0 0 24 24"
+        xmlns="http://www.w3.org/2000/svg"
+      >
+        <title>
+          Loading spinner
+        </title>
+        <circle
+          class="opacity-25"
+          cx="12"
+          cy="12"
+          r="10"
+          stroke="currentColor"
+          stroke-width="4"
+        />
+        <path
+          class="opacity-75"
+          d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+          fill="currentColor"
+        />
+      </svg>
+    </div>
+  `)
+})

examples/react-testing-lib/src/components/Spinner.tsx

@@ -0,0 +1,29 @@
+import React from 'react'
+
+export function Spinner() {
+  return (
+    <svg
+      className="currentColor -ml-1 mr-3 h-5 w-5 animate-spin"
+      fill="none"
+      viewBox="0 0 24 24"
+      xmlns="http://www.w3.org/2000/svg"
+    >
+      <title>Loading spinner</title>
+      <circle
+        className="opacity-25"
+        cx="12"
+        cy="12"
+        r="10"
+        stroke="currentColor"
+        strokeWidth="4"
+      >
+      </circle>
+      <path
+        className="opacity-75"
+        d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+        fill="currentColor"
+      >
+      </path>
+    </svg>
+  )
+}