Jest assertions
A value is not undefined
To test that a string value is not undefined in a Jest test, you can use the toBeDefined()
matcher.
Here is an example of how to use this matcher:
test('string is not undefined', () => {
const str = 'hello';
expect(str).toBeDefined();
});
This test will pass if the value of str
is not undefined
.
You can also use the not
modifier to test that a value is undefined
. For example:
test('string is not undefined', () => {
const str = 'hello';
expect(str).not.toBe(undefined);
});
I hope this helps. Let me know if you have any questions or need further assistance.
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