to be defined

• <any> [not] to be defined

Asserts that the value is defined.

expect('Hello world!', 'to be defined');
expect({ foo: { bar: 'baz' } }, 'to be defined');

This assertion can be negated using the not flag:

expect(undefined, 'not to be defined');

In case of a failing expectation you get the following output:

expect(undefined, 'to be defined');

expected undefined to be defined