We often want to test that calculations are being carried out correctly, according to some business rule. Tables of concrete examples help us to understand business needs and communicate what’s required. Here, we will focus on how to read such Fit tests; later, we will show how to write them.
We begin with two simple examples that test calculations by using tables of type
ColumnFixture, which is designed to do this.
These tests are rather abstract in that they say nothing about how someone using the system under test will see the consequences of this business rule. In Chapter 4, we’ll see tests that are more aligned to the step-by-step use of the system under test.