Mathabo/Lebo Adding Unit, Measurement and MeasurementTest with Two Tests
mathabo/Lebo calculating measurement using enums
[Lebo/Mathabo/Wole][S]
Revert "[Lebo/Mathabo/Wole][S]"

This reverts commit 64233fefbf5074948beef42766fa8801100c936c.
[Lebo/Mathabo/Wole][Adds test for comparing different values for inches]
[Lebo/Wole/Mathabo][added a test for checking negative unit value]
Adding the formatting changes and the null check
Adding last commit - Tests and implementation of the measurements