使用React，Jest，React-Testing-Library测试失败的案例

Question

I have a React component that throws an Error when programming is wrong. For example, the component Component takes the required prop data , and I have:

if (!data) { throw new Error("data is not provided") }

written in my component to handle this error. Using jest my test says:

test("throw invalid component error", () => {
    mockConsole();
    const { container } = render(<Component />);
    expect(container).toThrowError();
});

When I run my test Jest says that the test fails and then it points me to the line where I have my throw new Error(...) written. Is what I'm trying to do possible in jest?

Answer 1

To assert a function to throw an error, you have to pass a function to the expect statement. In your case:

test('...', () => {
  expect(() => {
    render(<Component />);
  }).toThrowError();
});