Unit testing is considered an essential part of the software development process. And it's the type of testing that software developers are most involved with. Because it requires an intimate knowledge of the code being tested. In unit testing, we look at our code one unit at a time. Test that unit thoroughly to. Aug 1, 2017 - I do not have the 'Create Unit Test' button which add some.

Many junior/fresher developers might be confused about who really should deal with Unit Testing. Unit test cases are written by developers. What is Unit Testing?

It tests behavior of a function/method by writing another piece of code. Image 1: Unit testing Why Unit Tests? • Normally, software projects are intended to run for long-term, at least for a minimum of five years.

• During this period, maintaining the application is very crucial. • Any change request received might impact the other functionality of the application. • So, before deploying the change in the production, a lot of regression testing has to be done. This consumes a lot of tester’s time. Imagine a situation where the change requests are happening very frequently. The efforts required for regression testing will be very high and the possibility of having defects will also be high. Software Maintenance with Normal approach (Regression Testing) Image 2: Regression Testing Regression Testing is the process of testing changes to computer programs, in order to make sure that the older programming still works with the new changes.

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Software Maintenance with Unit Testing Image 3: Unit Tests • Unit Tests will certainly help in minimizing the Regression Testing. • Every method will be associated with Test Methods. Test Methods will test the purpose of the actual method. • Test Methods will check for the following scenarios: • Positive / Success scenario • Negative / Failure scenario • Exception / Error Handling scenario • A normal method might require more than one Test Method depending on the complexity of the Method. • Before code delivery, developer has to ensure that all the test methods (in the entire solution) are getting passed. Software maintenance with TDD (Test Driven Development) Image 4: TDD TDD is an evolutionary approach to the development. It combines test-first development where you write a test before you write just enough production code to fulfill that test; and then, refactor the code to pass the test.

Writing Unit Test cases We have two frameworks to write Unit Test cases in C#. • MS Test • NUnit We have AAA pattern to write Unit Test cases: Image 5: AAA • Arrange all the necessary preconditions and inputs. • Act on the object or method under test.

• Assert that the expected results have occurred. Following are the steps to create the unit test project: Right click on the solution explorer and click on Add and select Unit Test Project, Image 6: Test Project Solution Explorer Image7: Solution Explorer Test Class.