The Problem
I created a very basic code example for better clarification. Here is the code I want to test (containing simple react hook):
const TodoHeader = ({ handleSubmit }) => {
const [value, setValue] = useState("");
return (
<form onSubmit={handleSubmit} data-testid="form">
<input
type="text"
placeholder="Your Todo.."
onChange={e => setValue(e.target.value)}
value={value}
data-testid="input"
/>
</form>
);
};
I want to test if the passed in handleSubmit prop will get executed. So I have set up this test:
it("should call the passed in onSubmit function", () => {
const mockFn = jest.fn();
const { getByTestId } = render(
<TodoHeader handleSubmit={mockFn} />
);
const form = getByTestId("form");
fireEvent.submit(form);
// This will fail (did not get executed)
expect(mockFn).toHaveBeenCalled();
});
Has it something to do with react hooks? I also tried to rerender it but same result. I don't know why this won't pass. The error message is:
Expected mock function to have been called, but it was not called.
Here is a codesandbox if you want to play around with it:
https://codesandbox.io/s/ypok50n709 (TodoHeader.js and TodoHeader.test.js)
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