Testacular Angular UI bootstrap 'directive' is required

I'm trying to unit test a controller which uses the Angular UI-Bootstrap dialog directive, but am receiving a Error: Argument 'directive' is required error.

This actually occurs as soon as I include the ui-bootstrap.min.js file in the Testacular config.

The controller is defined as:

angular.module('xFormsEntries')
    .controller('xFormsEntryListCtrl', function ($scope, $dialog, Form, FormEntry, FormField) {...

The unit test is:

describe('xForms Controllers', function() {

    beforeEach(function() {
        this.addMatchers({
            toEqualData: function(expected) {
                return angular.equals(this.actual, expected);
            }
        });
    });

    beforeEach(module('xFormsServices'));
    beforeEach(module('xFormsEntries'));

    describe('xFormsEntryListCtrl', function() {
        var scope, ctrl, $httpBackend, $dialog;
        var formData = {formId: 1, name: 'FormName'};

        apiURL = ''; // Override the global API URL

        beforeEach(inject(function(_$httpBackend_, $rootScope, $controller, _$dialog_) {
            // Arrange
            $httpBackend = _$httpBackend_;
            $httpBackend.expectGET('/xFormsAPI/Form').respond(formData);

            $dialog = _$dialog_;

            scope = $rootScope.$new();
            scope.formId = 1;
            ctrl = $controller('xFormsEntryListCtrl', {$scope: scope});
        }));

        it('should fetch the form from the server', function () {
            expect(scope.formModel).toBe(undefined);
            $httpBackend.flush();
            expect(scope.formModel).toEqualData(formData);
        });
});

All tests were passing before integrating UI-Bootstrap.

I've tried adding beforeEach(module('ui.bootstrap'));, and other variations, into the test with no luck.

What magic include am I missing to make this work?