Using sinon stubs

In the previous post we had a look at sinon spies. With spies, we are able to determine if a specific function was called or not. Usually the dependencies between units are more interesting, they involve units co-operating, exchanging data and so on. Spies do not suffice. Let’s have a look at another technique, using stubs. Continue reading “Using sinon stubs”

Using sinon spies

In the previous post, we implemented a new feature for our calculator: it makes a bell sound when you divide by zero. The bell is a simple function that the calculator calls and it is provided as a constructor dependency. We wrote a unit test for this as well, but the code for that is a bit verbose. Let’s see how we can use a mocking library like sinon to reduce and standardize the testing code. Continue reading “Using sinon spies”

The division by zero bell – Dependencies in unit tests

We left our calculator in the previous post in a decent state, being able to do the four basic mathematical operations. In the special case of division by zero, we want the calculator to make a noise like a bell. Let’s see what we can do about this. Continue reading “The division by zero bell – Dependencies in unit tests”

What is Test Driven Development?

Let’s continue building up our calculator with more mathematic operations. So far we have addition and subtraction, so multiplication comes up next. ┬áIn this post, we’ll have a look at test driven development. Even though the examples are a bit trivial, I hope they’ll outline the important points. Continue reading “What is Test Driven Development?”