Roberto Cosenza

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jsUnit testing a method of a class with a boring constructor

Friday, August 29th, 2008

Today I wanted to introduce some jsUnit testing in an old class. In particular I wanted to test a single method in isolation but I could not instantiate the object itself since the constructor had dependency on other files.

load("ClassToTest.js"); function testMyMethod() { var object = new ClassToTest(); // This does not work since //ClassToTest has a boring constructor! object.runMethod(); //do some asserts }

The trick is to replace the object with a new one which has the same prototype but an empty constructor:

load("ClassToTest.js"); function NewClass() {}; // empty constructor or whatever you like NewClass.prototype = ClassToTest.prototype; function testMyMethod() { var object = new NewClass(); // This works, since // it has an empty constructor object.runMethod(); // this exists and it is the same //method living on ClassToTest //do some asserts }

One Response to “jsUnit testing a method of a class with a boring constructor”

1. Procopia Says:
   October 22nd, 2008 at 11:02 am

   Good post.

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