jasmine-class-mock

Create a mock class for the Jasmine framework, optionally with a stub methods that exist on a real class.

Usage

var classMock = require('jasmine-class-mock');

Empty class

var MyClass = classMock.create("MyClass");
var myInstance = new MyClass();
expect(MyClass.instance.count()).toBe(1);

Adding mehods and other properties

var MyClass = classMock.create("MyClass", { spyFunc: jasmine.createSpy("spyFunc") });
var myInstance = new MyClass();
myInstance.spyFunc();
expect(myInstance.spyFunc).toHaveBeenCalled();
expect(MyClass.mostRecent().spyFunc).toHaveBeenCalled();

Adding static methods

var MyClass = classMock.create("MyClass", {}, { spyStaticFunc: jasmine.createSpy("spyStaticFunc") });
MyClass.spyStaticFunc();
expect(MyClass.spyStaticFunc).toHaveBeenCalled();

Mocking from an existing template

var MyDate = classMock.create("MyDate", { toLocaleDateString: function () { return "hahaha"; }, Date);
var d = new MyDate();
expect(d.toLocaleDateString()).toBe("hahaha");  // calls stub
expect(d.toLocaleTimeString()).toBeUndefined(); // template methods are replaced by noop

API

create(name, members, staticMembers, realClass)

name: String

(optional) label representing the constructor calls in log messages.

members: object

(optional) member functions and attributes of the returned class instance. At least an empty object must be present if staticMembers exist.

staticMembers: object

(optional) static functions and attribute of the returned class itself.

realClass: function

(optional) template to create the returned class from. Functions are replaced by empty functions returning no value, unless overwitten by members or staticMembers.

Return value

A Jasmine spy that acts as a class constructor. Extra properties:

first: object

The first instance of the class created by a new operator.

mostRecent: object

The last instance of the class created by a new operator.

instance(i): object

ith instance of the class created by a new operator.

instance.count(): int

Total number of instances created.