Can you distinguish between these two methods in react-testing-library?
expect(screen.queryByText('<something>')).toBeInTheDocument();
And
screen.getByText('<something>');
(The specific getBy* and queryBy* operation are not relevant)
Can you distinguish between these two methods in react-testing-library?
expect(screen.queryByText('<something>')).toBeInTheDocument();
And
screen.getByText('<something>');
(The specific getBy* and queryBy* operation are not relevant)
findByText attempts to locate the node and raises an error if it is unable to do so, resulting in an immediate test failure.
On the contrary, queryByText will simply return null if the node cannot be found.
Imagine you have the text <something> within the rendered component, you can verify whether it has been rendered or not.
If you are certain that the text has been rendered, you can use findByText
expect(screen.findByText('<something>')).toBeInTheDocument();
and the test will pass successfully.
If in a scenario the text was not rendered, the above assertion will result in an error and fail the test.
In such situations, using queryByText makes more sense.
When <something> has not been rendered
expect(screen.findByText('<something>')).not.toBeInTheDocument(); // throws an error
expect(screen.queryByText('<something>')).not.toBeInTheDocument(); // validates as true
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