jasmine - how to check if an argument exists?

Question

good day.

im testing to see function got all her args.

i know what value two of her args must have,

but for the third arg, i just want to test if it exists.

expect(myFunction).toHaveBeenCalledWithMatcher({
    a: 1,
    b: 2,
    c: dont know its val but want it to exist
});

thanks in advance

Answer 1

You can also use jasmine.any. In case you expect a number it could be:

expect(myFunction).toHaveBeenCalledWith({
    a: 1,
    b: 2,
    c: jasmine.any(Number)
});

It is also possible jasmine.any(Function) and so on. From Jasmine doc:

jasmine.any takes a constructor or “class” name as an expected value. It returns true if the constructor matches the constructor of the actual value.