Extend Inaccessible Class In C#

In today's section, we'll see how to extend even inaccessible class and write test against that, but before that let us assume that you have the following class:

Here, It's quite easy to write test for getFirstValue() as in the following code snippet.
And this will pass. Similarly, we can write test for other (next one) as well and that will also pass.
But, for the third one, which is private, we need to make use reflection as in the following code snippet:
Here, using reflection, I got the access of that private method and then created instance and hence tested the same. However, let us suppose, you would like to extend this class and make more reusable. In real time project scenario, your extension could be more meaningful. But, here for demo purpose, I am just extending the class to modify the output.
In order to test the same, I can go ahead and write the test case as in the following code snippet:
Very powerful and easy to use, right?

Similarly, we can go ahead and extend the second class as in the following code snippet:
And, again test for the same will look like the following:
However, if we try to access the third class as in the following, it won't be accessible, since it's private.
Here, to rescue us again, reflection will come into picture. The following is the code snippet:
Similarly, we can write test for the same as in the following code snippet: