Unit testing
When we talk about test cases, we mostly mean unit tests. It is incorrect to assume that the unit we want to test is always a function. The unit, or unit of work, is a logical unit that constitutes single behavior. This unit should be able to be invoked via a public interface and should be testable independently.
Thus, a unit test can perform the following functions:
- It tests a single logical function
- It can run without a specific order of execution
- It takes care of its own dependencies and mock data
- It always returns the same result for the same input
- It should be self-explanatory, maintainable, and readable
Martin Fowler advocates the Test Pyramid (http://martinfowler.com/bliki/TestPyramid.html) strategy to make sure we have a high number of unit tests to ensure maximum code coverage. There are two important testing strategies that we will discuss in this chapter.
Test Driven Development
Test driven development (TDD) has gained a lot of prominence in the last few years. The concept...
