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26 lines
856 B
Markdown
26 lines
856 B
Markdown
# Turn Off Console Error Messages In A Test
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I'm using [Jest](https://facebook.github.io/jest/) to test a React component
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that requires a prop via
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[PropTypes](https://reactjs.org/docs/typechecking-with-proptypes.html). In
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one of my tests, I want to test that component when the required prop is
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excluded. The side effect of doing this is that my test output gets
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cluttered with the PropType warning.
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The thing to do is silence the error message during that test.
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```javascript
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it('renders a component without a required prop', () => {
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const originalError = console.error;
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console.error = jest.fn();
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// test code here
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expect(shallow(<My Component />)).toDoSomething;
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console.error = originalError;
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});
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```
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We can silence `console.error` by temporarily replacing it with a
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Jest-mocked function and then putting it back at the end of the test.
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