https://app.pluralsight.com/library/courses/testing-angularjs-from-scratch/

Getting Started

Getting the Software

• Jasmine, test framework; Karma, test runner

BDD and AngularJS

...

Spy vs. Spy

Introduction

• Matchers - e.g. toBe(). Can create custom matchers
• Jasmine spies - aka doubles, fakes, mocks

Refactoring

• removed expense.js; expenseItem object constructor updated to accept parameters to specify type, description and amount expenseItem.js now returns an array of ExpenseItem instead of anonymous objects

Custom Matchers

• e.g. for the test expect(taxi).toBeLessThan(100);
• declare custom matchers in spec\SpecHelper.js:

 var customMatchers = {
    toBeAReasonableExpense: function(actual){
      return {
        compare: function(actual){
          var pass = actual.isReasonable();
          var judgement = pass ? "unreasonable" : "reasonable";
          return {
            pass: pass,
            message: 'Expected expense to be a ' + judgement + ' expense.';
          }
        }
      }
    };
}

then, in spec (test) file:

  beforeEach(function() {
    jasmine.addMatchers(customMatchers);
    });
  ...
  ...
  expect(taxi).toBeAReasonableExpense();

• describe() can be nested
• to use negation of the custom matcher, use expect(taxi).not.toBeAReasonableExpense();

Spies

• Jasmine feature: 'Spies' - e.g. test whether methods have been called and for creating mocks

var spyCallback = jasmine.createSpy('callBackSpy');
expensesDataService.persistExpenses(spyCallback);
expect(spyCallback).toHaveBeenCalled();

also,

var spy = spyOn(expensesDataService, 'persistExpenses');
expensesDataService.persistExpenses();
expect(spy).toHaveBeenCalled();

• can use spies to fake behaviour
• can use spies to create mocks:

var spy = spyOn(expensesDataService, 'persistExpenses').and.callFake(function(){
  return 3;
  });
var numberOfRecordsPersisted = expensesDataService.persistExpenses();
expect(numberOfRecordsPersisted).toEqual(3);