Testing MUI Components Comprehensive patterns for testing Material UI components with React Testing Library, covering theme integration, complex widgets, accessibility, and common pitfalls. 1. ThemeProvider Wrapper MUI components rely on for styling and behavior. Always wrap renders in your custom theme to get accurate test results. renderWithTheme Utility Usage 2. Portal Components MUI Dialog, Menu, Popover, Snackbar, and Tooltip render into portals (appended to ). They are still found by RTL queries because RTL searches the entire document by default. Testing Dialog Testing Menu Testing Sna…