What is the best way to design a tool for Jasmine/Angular that can consolidate multiple beforeEach functions?

I'm having a problem with repeating code in my spec file where I inject a template and then compile it. To keep things DRY, I decided to extract this code into a helper function. However, I think the issue lies in trying to use multiple beforeEach statements within the helper function. Here is the specific section of code that I am attempting to abstract:

  beforeEach(module('app/views/header.html'));

  beforeEach(inject(function($templateCache, $compile, $rootScope) {
    template = $templateCache.get('app/views/header.html');
    $templateCache.put('views/header.html', template);
    var directive = angular.element('<clinical-header></clinical-header>');
    element = $compile(directive)($rootScope);
    $rootScope.$digest();
  }));

This is the helper function I created:

var setupTemplate = function(templateName, element) {
  beforeEach(module('app/views/' + templateName));
  beforeEach(inject(function($templateCache, $compile, $rootScope) {
    var template = $templateCache.get('app/views/' + templateName);
    $templateCache.put('views/' + templateName, template);
    var directive = angular.element(element);
    element = $compile(directive)($rootScope);
    $rootScope.$digest();
  }));

And here is how I am calling the helper function:

setupTemplate('header.html', '<clinical-header></clinical-header>');

Although everything looks good at the end of my helper function, when I move to my it block, everything becomes undefined. Is it possible to have multiple beforeEach statements in a helper function? What is the correct way to approach this? Also, where should jasmine helper functions be placed and how can that be achieved?

Answer №1

To implement global beforeEach() functions, write them outside of a specific describe function. It is recommended to create a spec-helper.js class containing these functions and then load it through the Karma configuration.

Keep in mind that the beforeEach functions will be executed before any it function you run, as they are considered global.

A demonstration can be found in this fiddle. The crucial step with Karma is ensuring that the file is added to the configuration so it loads properly in the browser.

Here's an example of a Spec Helper:

var myGlobal;
beforeEach(function() {
    // This code will run before any it function.
    // Resetting a global state allows changes to be tested
   myGlobal = 10
});

And a Test Suite:

describe('first suite', function(){
   it('is a test', function(){
     expect(myGlobal).toBe(10);
     // Resetting the value demonstrates that beforeEach is executed for each it function
     myGlobal = 20;
     expect(myGlobal).toBe(20);
  });

  it('is another test', function($location){
     expect(myGlobal).toBe(10);
     myGlobal = 20;
     expect(myGlobal).toBe(20);
  });
});

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