DM-8854:Create a Unit test for Rotate class

[lznakano]

DM-8854:
Add unit test for Rotate class
Add the algorithm descriptions

The coverage is 80%. There is a main program inside which made the coverage lowered. To
test it, please run:
gradle :firefly:test

Thanks!

[cwang2016]

should this be -sin(angle) or +sin(angle)?

[lznakano]

Yes, I have the correct document in RotateTest.java but Roate.java. There is nothing documented there when I started working on this ticket. I added the algorithm in RotateTest.java. I also added some in Rotate.java. I created another ticket for Rotate.java. I will update the document and the code then.

[cwang2016]

review complete. Here is some concern,

• the unit test contains the computation to calculate the expected output used for baseline, how would this piece of computation to be verified? The class to be tested, rotate.class, intends to build rotation matrix for the purpose to rotate any given world point to be aligned with x axis at 180 deg direction (as I traced its code), so the unit test should just check if input point used for the baseline is rotated to (-1, 0, 0) while testing 'do_rotate' function in Rotate.class. Since the functional description is not seen from the document of the tested class, so it is understandable why the algorithm is coded and put inside the unit test.

You may merge the branch. Thanks.