to have key

• <object> to [not] [only] have key <string>

Asserts the presence of a key.

Alias for to be have keys.

expect({ a: 'a', b: 'b', c: 'c' }, 'to have key', 'a');

Using the only flag you can assert that the object only have the specified key.

expect({ a: 'a' }, 'to only have key', 'a');

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

expect({ a: 'a', b: 'b' }, 'to have key', 'c');

expected { a: 'a', b: 'b' } to have key 'c'

This assertion can be negated using the not flag:

expect({ a: 'a', b: 'b' }, 'not to have key', 'c');
expect(Object.create({ a: 'a', b: 'b' }), 'not to have key', 'a');

Using the only flag you can assert that the object not only have the specified key.

expect({ a: 'a', b: 'b' }, 'to not only have key', 'a');

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

expect({ a: 'a', b: 'b' }, 'to not have key', 'a');

expected { a: 'a', b: 'b' } to not have key 'a'