Is it possible to use Jasmine's toHaveBeenCalledWith matcher with a regular expression?

Question

I have reviewed Jasmine\'s documentation of the toHaveBeenCalledWith matcher in order to understand whether it\'s possible to pass in a regular expression for an argument, i

Answer 1

Sometimes it is more readable to write it this way:

spyOn(obj, 'method').and.callFake(function(arg1, arg2) {
    expect(arg1).toMatch(/bar/);
    expect(arg2).toMatch(/baz/);
});
obj.method('bar', 'baz');
expect(obj.method).toHaveBeenCalled();

It give more clear visibility of method arguments (instead of using array)

Answer 2

Alternatively, if you are spying on a method on an object:

spyOn(obj, 'method');
obj.method('bar', 'baz');
expect(obj.method.argsForCall[0][0]).toMatch(/bar/);
expect(obj.method.argsForCall[0][1]).toMatch(/baz/);

Answer 3

As jammon mentioned, the Jasmine 2.0 signature has changed. If you are spying on the method of an object in Jasmine 2.0, Nick's solution should be changed to use something like -

spyOn(obj, 'method');
obj.method('bar', 'baz');
expect(obj.method.calls.mostRecent().args[0]).toMatch(/bar/);
expect(obj.method.calls.mostRecent().args[1]).toMatch(/baz/);

Answer 4

In Jasmine 2.0 the signature changed a bit. Here it would be:

var mySpy = jasmine.createSpy('foo');
mySpy("bar", "baz");
expect(mySpy.calls.mostRecent().args[0]).toMatch(/bar/);
expect(mySpy.calls.mostRecent().args[1]).toMatch(/baz/);

And the Documentation for Jasmine 1.3 has moved.

Answer 5

After doing some digging, I've discovered that Jasmine spy objects have a calls property, which in turn has a mostRecent() function. This function also has a child property args, which returns an array of call arguments.

Thus, one may use the following sequence to perform a regexp match on call arguments, when one wants to check that the string arguments match a specific regular expression:

var mySpy = jasmine.createSpy('foo');
mySpy("bar", "baz");
expect(mySpy.calls.mostRecent().args[0]).toMatch(/bar/);
expect(mySpy.calls.mostRecent().args[1]).toMatch(/baz/);

Pretty straightforward.

Answer 6

As of Jasmine 2.2, you can use jasmine.stringMatching:

var mySpy = jasmine.createSpy('foo');
mySpy('bar', 'baz');
expect(mySpy).toHaveBeenCalledWith(
  jasmine.stringMatching(/bar/),
  jasmine.stringMatching(/baz/)
);