{"id":1122,"date":"2019-06-17T18:46:21","date_gmt":"2019-06-17T18:46:21","guid":{"rendered":"http:\/\/talentedtester.com\/?p=1122"},"modified":"2019-10-10T18:48:07","modified_gmt":"2019-10-10T18:48:07","slug":"difference-between-progression-and-regression-testing","status":"publish","type":"post","link":"http:\/\/talentedtester.com\/difference-between-progression-and-regression-testing\/","title":{"rendered":"Progression vs Regression Testing (Big Difference?)"},"content":{"rendered":"

If you have ever heard of progression testing, then the chances are, you may have heard of regression testing. But are they different? similar, or something completely different? Let me explain…<\/p>\n

What’s the difference between progression and regression testing? Progression testing focusses on new functionality and proving that it works as per the requirements. Whereas regression testing focuses on proving that existing functions of the application are not broken from the addition of new code.<\/strong><\/p>\n

During my years of testing, regression, and progression testing have been critical. Especially when you are dealing with systems that have serious impacts on customers. So, let me explain in further detail the major differences. In addition to this, I will give some examples to make it more understandable.<\/p>\n

What is progression testing?<\/h2>\n

Is reality its another word for saying functional testing. Some people also refer to this as incremental testing (Click here to see what the incremental model really is<\/a>), depending on what type of testing model you’re using.<\/p>\n

Essentially, it’s testing new functionality in a methodical approach. To make sure that the new functionality matches the desired requirements.<\/p>\n

I say sometimes referred to as the “incremental model” because it depends on what model of testing is being used. For example, you could be using the V-model.<\/p>\n

However, whatever your model of choice is, progression testing still comes down to testing new functionality against your requirements.<\/p>\n

What exactly is functional testing?<\/h2>\n

Functional testing is a method of verifying the outcome of the application in comparison to the agreed requirements.<\/p>\n

It is often referred to as a form of “black box testing”. This is commonly referred to as black box because we are not focused on the underlying code for this. Testing code modules is known as unit testing (Click here to see the difference between unit and integration testing<\/a>) or “white box testing”.<\/p>\n

So, ultimately with functional testing, you are looking at the functions of the system and making sure that expected outputs are seen, are you with me?<\/p>\n

So, what is regression testing?<\/h2>\n

Regression testing (Click here to see What Change Related Testing is?<\/a>) is different from progression testing. Ultimately, with regression testing, we are making sure that we have not broken anything when we introduce new code. Simple as that.<\/p>\n

Let me give you a working example here…<\/p>\n

Example: Calculator App<\/h3>\n

Let’s assume that you’re testing a calculator application. Currently, it is very basic and can only add and subtract, nothing else.<\/p>\n

Now requirements have been drawn up to add a multiplication feature to this app. We can also assume that the application is fully functional and in production at present.<\/p>\n

To regression test, the calculator application after the new multiplication feature is tested. You need do some additional tests to:<\/p>\n