Add unit tests for Branch module

[graudtv]

Correspond to issue #512

[codecov]

Codecov Report

Merging #1445 (8505cbb) into master (a39e74d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           master    #1445    +/-   ##
========================================
  Coverage   99.91%   99.91%            
========================================
  Files         135      137     +2     
  Lines       11014    11128   +114     
========================================
+ Hits        11005    11119   +114     
  Misses          9        9            

Impacted Files	Coverage Δ
simulator/modules/branch/branch.cpp	100.00% <ø> (ø)
simulator/modules/branch/branch.h	100.00% <ø> (ø)
simulator/modules/branch/t/unit_test.cpp	100.00% <100.00%> (ø)
simulator/modules/t/test_instr.h	100.00% <100.00%> (ø)

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[pavelkryukov]

Please take into account my comments and CodeCov note.

[graudtv]

Codecov makes a mistake. That line is inlined and optimized, so there is no call, but it is necessary

[pavelkryukov]

Codecov makes a mistake. That line is inlined and optimized, so there is no call, but it is necessary

Then add a call in a new test case.
Now, we can write here anything (1 / 0) and tests won't cover it.

[graudtv]

It will also be optimized. Calling something like cout << taken_and_predicted_branch; does nothing;

[pavelkryukov]

No, it is not. For code coverage, we disable all optimizations. See other code lines in headers — they are not inlined.

[pavelkryukov]

You may add some dummy output (return out << “BranchTestInstr”)

[pavelkryukov]

I've sent a patch with test for BranchTestInstr::operator<<.