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The Jest docs do not demonstrate a way of asserting that no exception was thrown, only that one was.
expect(() => ...error...).toThrow(error)
How do I assert if one was not thrown?
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If you want to test a scenario in which an exception should be thrown then you should use the expected annotation. If you want to test a scenario where your code fails and you want to see if the error is correctly handled: use expected and perhaps use asserts to determine if it's been resolved.
to use throw to thrown an error in the mocked implementation of yourMockInstance . If we're mocking async functions, we can use mockRejectedValue to mock the value of a rejected promise returned by the async function. test('async test', async () => { const yourMockFn = jest. fn().
Jest uses a custom resolver for imports in your tests, making it simple to mock any object outside of your test's scope. You can use mocked imports with the rich Mock Functions API to spy on function calls with readable test syntax.
You can always use the .not method, which will be valid if your initial condition is false. It works for every jest test:
expect(() => ...error...).not.toThrow(error) https://facebook.github.io/jest/docs/en/expect.html#not
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