Implement test "add" and "scal"

[gulivarese]

Closes #1042 I implemented the scal test. Next week I will implement another test about add.

[gulivarese]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1d667c7) 93.99% compared to head (e11aeef) 94.02%. Report is 35 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1070 +/- ## ========================================== + Coverage 93.99% 94.02% +0.02% ========================================== Files 145 145 Lines 8928 8930 +2 Branches 1142 1143 +1 ========================================== + Hits 8392 8396 +4 + Misses 320 319 -1 + Partials 216 215 -1 ```

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[gulivarese]

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[rasolca]

@gulivarese I think that the tests are not compiling. please check.

[gulivarese]

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[gulivarese]

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