Testing react component with jest
Problem:
I want to test the Sidebar component. When you click on the "ToggleButton" it should toggle sidebar by className, but when clicking, an error appears stating that the function was not found...
Thank you!
Error: TypeError: setToggleSidebar is not a function
Sidebar.test.tsx
describe("Sidebar", () => { test("Toggle Sidebar", () => { const { result } = renderHook(() => useToggleSidebar());
const { toggleSidebar } = result.current;
ComponentRender(<ToggleButton toggleFunc={toggleSidebar} />); ComponentRender(<Sidebar />);
fireEvent.click(screen.getByTestId("toggle-button"));
expect(screen.getByTestId("sidebar")).toHaveClass("HiddenSidebar"); }); }); |
componentRender.tsx
export function ComponentRender(component: JSX.Element, options: IComponentRenderOptions = {}) { const { route = "/dashboard", initialState } = options;
return render( <ReduxProvider initialState={initialState}> <ThemeProvider> <SidebarProvider> <MemoryRouter initialEntries={[route]}>{component}</MemoryRouter> </SidebarProvider> </ThemeProvider> </ReduxProvider>, ); } |
sidebarProvider.tsx
export const SidebarProvider = (props: PropsWithChildren) => { const { children } = props;
const [isSidebarShow, setToggleSidebar] = useState<boolean>(false);
const defaultValue: ISidebarDefault = useMemo( () => ({ isSidebarShow, setToggleSidebar, }), [isSidebarShow], );
return <SidebarContext.Provider value={defaultValue}>{children}</SidebarContext.Provider>; }; |
useToggleSidebar.tsx
const useToggleSidebar = (): IUseToggleSidebar => { const { isSidebarShow, setToggleSidebar } = useContext(SidebarContext);
const toggleSidebar = () => { setToggleSidebar((isSidebarShow: boolean) => !isSidebarShow);
^ <-- HERE IS ERROR setToggleSidebar is not a function
};
return { isSidebarShow, toggleSidebar }; }; |
I tried to destructure the useToggleSidebar hook directly
Solution:
You have to wrap your hook inside the Context
const { result } = renderHook(() => useToggleSidebar(), { wrapper: SidebarProvider }); |
Beause you were rendering useToggleSidebar lack of context, just simulator it like the real one
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