MooTools

How to use

Stubbing

For creating stubs, we create a new Moock.Stub instance:

var stub = new Moock.Stub([retunedValue])

The returned object provides the following helpers for the supported librarys:

• called : (bool|number) how many times should the function be called. If set to true, the method should be called at least once. If set to false, will not expect it to run.
• receive : (array) an array representing the arguments that should be passed to the function
• returnedValue : a value that the function should return (replaces the construction value)
• test : tests if the expectations were met.

Example:

var stub = new Moock.Stub()
    .called(1)
    .receive(["a","b"])
    .returnedValue("aabb");

console.log(stub("a","b")); //aabb
stub.test();

For chaining, the library supplies a helper variable - Moock.return_self:

var obj = {
    stub : new Moock.Stub().returnedValue(Moock.return_self)
};

assertTrue(obj === stub());

The returned value can also be a function. If so, the function will be used when the stub is called, receiving the passed arguments:

var stub = new Moock.Stub(function(a,b){return a+b});

console.log(stub("a","b")); //ab

Lastly, for those who want to use the library with non-supported libraries, the Stub object also supllies these low-leveled properties that you can use to test your stubs:

• used (int) : how many times the stub was called
• args (array) : what argumens were passed to the stub on the last call
• returned : what value to return when the stub is called.

Example:

var stub = new Moock.Stub('aaa');

console.log(stub("a")); //aaa
console.log(stub.used); //1

console.log(stub.args); //["a"]

Adding more library support

If you wish to add support for more libraries, simply add them to the Moock.Libraries object. Each addition should be an object containing the folowing properties/methods:

• check : wheather or not to use the library on the current run. Should be a check for library availibility
• isTrue : passed 2 variables- an expresion and a message. Should run your library of choise assertion.
• areEqual : passed 3 variables - expected, actual and message.

For more usage details, look up Libraries.Extra.js.

Mocking

Moock.Mock

This tool allows you to create a mock of a JS object. The constructor accepts 3 arguments:

1. The object to mock
2. A list of methods to Stub and their returned value
3. A function to call on construction. The method will be scoped to the created Object and will receive the construction arguments.

Usage Example:

//some basic constructor
function Construct(a,b){
    this.a = a;
    this.b = b;
}

//adding methods
Constructs.prototype = {
    doSomething : function(){
        console.log(this.a);
    } , 
    doElse : function(){
        this.doSomething();
    }
};

var test = false, 
    old = Constructor; //keeping the old constructor 

//MOCKING HERE \/

Constructor = new Moock.Mock(
    Construct, 
    {   
        doSomething : function(){
            test = true;    
        }
    }
    , function(a,b){
        Moock.Assert.areEqaul(a,'a');
        Moock.Assert.areEqual(b,'b');

        Moock.Assert.areEqaul(this.a,'a');
        Moock.Assert.areEqual(this.b,'b');
    }
);

(new Constructor('a','b')).doElse();

Constructor = old; //returning the constructor to its original value

Moock.Assert.isTrue(test,"do something should have been called");

Class.Mutators.Mock

The package adds a new Class Mutator called Mock. It receives a literal object containing a list of method names to mock paired with returned value. NOTE - all stubbed methods are full Moock.Stub instances

/* simple usage */
var mock = new Class({
    Mock : {
        'methodA' : 'aaa'
    }
});

var m = new mock;

assertFalse(m.methodA.called);
assertEquals("aaa",m.methodA('bbb'));
assertTrue(m.methodA.called);
assertEquals(['bbb'],m.methodA.args);

Creating a Class's Mock:

var cls = new Class({
    methodA : function(){/* do something */ }
});

var mock = new Class({
    Extends : cls
    , Mock : {
        'methodA' : 'aaa'
    } 
});

var m = new mock;
assertTrue(m instanceof cls);
assertTrue(isStub(m.methodA));

Mocking only certain parts of a Class:

var cls = new Class({
    methodA : function(){}
    methodB : function(){
        console.log(this.methodA("a","b","c");)
    }
});

var mock = new Class({
    Extends : cls
    , Mock :{
        methodA : "bbb"
    }
});

var m = new mock;
m.methodB(); //logs "bbb"

assertEqauls(["a","b","c"],m.methodA.args);

The package also comes with a helper function - getMock - that creates a mock that is an instance of a certain Class. If that Class is not defined, the helper will create a mock of that Class. This is useful for dependency injection tests:

var mock = getMock('ClassA',{
    doSomething : 'something'
});

var m = new mock;

assertTrue(m instanceof ClassA); //works whether there is a real ClassA or not

Discuss

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