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jasmine partial string matching

I love the partial object matching that jasmine.objectContaining provides:

mySpy({
   foo: 'bar',
   bar: 'baz' 
});
expect(mySpy).toHaveBeenCalledWith(jasmine.objectContaining({ foo: 'bar' }));

Is there a jasmine equivalent for strings? something along the lines of:

mySpy('fooBar', 'barBaz');
expect(mySpy).toHaveBeenCalledWith(jasmine.stringContaining('foo'), jasmine.any(String));

I’d like to look at a specific argument without resorting to assertions off mySpy.calls:

mySpy('fooBar', 'barBaz');
expect(mySpy.calls.argsFor(0)[0]).toContain('foo');

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Answer

There isn’t anything of this sort in Jasmine. But you can leverage the ability of creating a custom matcher in Jasmine for this.

Here’s a small working example:

Your Factories

angular.module('CustomMatchers', []).factory('AnotherService', function(){
    return{  mySpy: function(a, b){ } }
});

angular.module('CustomMatchers').factory('MyService', function(AnotherService){
    return{ 
        myFunction: function(a, b){
            AnotherService.mySpy(a, b);
        }
    }
});

Your test case with a custom matcher

describe('Service: MyService', function() {
    beforeEach(module('CustomMatchers'));
    describe('service: MyService', function() {

        beforeEach(inject(function(_MyService_, _AnotherService_) {
            MyService = _MyService_;
            AnotherService = _AnotherService_;

            spyOn(AnotherService, 'mySpy');

            jasmine.addMatchers({
                toContain: function() {
                    return {
                        compare: function(actual, expected){
                            var result = { pass: actual.includes(expected) };
                            if(result.pass) {
                                result.message =  "Success: Expected first arguments '" + actual + "' to contain '"+ expected +"'.";
                            } else {
                                result.message =  "Failour: Expected first arguments '" + actual + "' to contain '"+ expected +"'.";
                            }
                            return result;
                        }
                    }
                }
            });

        }));

        it('expect AnotherService.mySpy toHaveBeenCalled', function() {
            MyService.myFunction('fooBar', 'barBaz');
            //This should pass
            expect(AnotherService.mySpy.calls.argsFor(0)[0]).toContain('foo');

            //This should fail
            expect(AnotherService.mySpy.calls.argsFor(0)[0]).toContain('helloWorld');
        });
    });
});

Hope this helps!

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