Similar to the manner in which an application's code base is structured to allow easy readability and for effective source code maintenance, unit tests should be structured. This is to facilitate easy maintenance and quick running of tests using the test runners from Visual Studio IDE.
A testcase is a test class containing test methods. It is usually common to have one test class per class under test. Another common practice of structuring tests among developers is to have a nested class for each method being tested or to have one base test class for the class under test and one subclass for every tested method. Also, there is the test class per feature approach, where all the test methods that collectively validate a feature of an application are grouped in a testcase.
These test-structuring approaches promote the DRY principle and essentially...