Right-B[I]CEP: Checking Inverse Relationships
Learn about writing the unit tests with the inverse relationship technique.
Logical inverse relationships
Sometimes, we’ll be able to check behavior by applying its logical inverse. For mathematical computations, this is often the case. We can:
- Verify division with multiplication
- Verify addition with subtraction
Implementation of the square-root function
Let’s take a look at the square-root function using Newton’s algorithm.
Remember that if we derive the square root of a number and square that result (that is, multiply it by itself), we should get the same number we started with:
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