Merge branch 'master' into next-core-mdx

Author: jxnblk

packages/theme-ui/test/color-modes.js

@@ -478,3 +478,25 @@ test('raw color values are passed to theme-ui context when custom properties are
   )
   expect(color).toBe('tomato')
 })
+
+test('warns when localStorage is disabled', () => {
+  Object.defineProperty(window, 'localStorage', {
+    get: jest.fn(() => {
+      throw 'SecurityError: The operation is insecure.'
+    }),
+  })
+
+  let mode
+  const Consumer = props => {
+    const [colorMode] = useColorMode()
+    mode = colorMode
+    return false
+  }
+
+  render(
+    <ThemeProvider>
+      <Consumer />
+    </ThemeProvider>
+  )
+  expect(mode).toBe('default')
+})