to be one of

• <any> [not] to be one of <array>

Asserts that the subject equals one of the given items

expect(true, 'to be one of', [true, false]);
expect(1, 'to be one of', [0, 1, 2]);

Aliases are provided for common types:

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

expect(42, 'to be one of', [0, 1]);

expected 42 to be one of [ 0, 1 ]

This assertion can be negated using the not flag:

expect(true, 'not to be one of', [1, 2]);