Add test with gtest

[Spacetown]

This PR modifies the existing CMake tests to use the -DCMAKE_BUILD_TYPE=PROFILE as described in the docs.

In addition a new test is added which use the gtest library from the docker container.

[latk]

Looks like a reasonable test!

Once the tests start passing, of course. We'd have to either install gtest in the Github CI runner and on developer machines, or skip the new tests outside of Docker (see the GCOVR_ISOLATED_TEST token that's set in the Dockerfile and used in test_args.py)

[Spacetown]

The test fails because the DTD for cobertura wasn't available. I'll update the test to use a copy of the DTD.

example_cobertura.xml:2: warning: failed to load external entity "http://cobertura.sourceforge.net/xml/coverage-04.dtd"

[Spacetown]

Looks like a reasonable test!

Once the tests start passing, of course. We'd have to either install gtest in the Github CI runner and on developer machines, or skip the new tests outside of Docker (see the GCOVR_ISOLATED_TEST token that's set in the Dockerfile and used in test_args.py)

I searched for a solution but missed GCOVR_ISOLATED_TEST. Is there a easy way to check in test_gcovr.py if the lib is a available?

[latk]

Is there a easy way to check in test_gcovr.py if the lib is a available?

At least on Linux, can query for the existence of a library with a suitable version like

pkg-config --atleast-version=1.12.0 gtest

[Spacetown]

Is there a easy way to check in test_gcovr.py if the lib is a available?

At least on Linux, can query for the existence of a library with a suitable version like

pkg-config --atleast-version=1.12.0 gtest

Since there is no command for Windows I'll rely on GCOVR_ISOLATED_TEST.

[codecov]

Codecov Report

Base: 94.78% // Head: 95.22% // Increases project coverage by +0.43% 🎉

Coverage data is based on head (eea0fa7) compared to base (a747492).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #676      +/-   ##
==========================================
+ Coverage   94.78%   95.22%   +0.43%     
==========================================
  Files          24       24              
  Lines        3452     3495      +43     
  Branches      662      615      -47     
==========================================
+ Hits         3272     3328      +56     
+ Misses         99       94       -5     
+ Partials       81       73       -8     

Flag	Coverage Δ
ubuntu-18.04	93.95% <100.00%> (?)
windows-2019	94.78% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gcovr/tests/test_args.py	98.86% <100.00%> (+<0.01%)	⬆️
gcovr/tests/test_gcovr.py	97.72% <100.00%> (+1.17%)	⬆️
gcovr/writer/cobertura.py	100.00% <0.00%> (ø)
gcovr/tests/test_config.py	100.00% <0.00%> (ø)
gcovr/tests/test_gcov_parser.py	100.00% <0.00%> (ø)
gcovr/tests/test_html_generator.py	100.00% <0.00%> (ø)
gcovr/workers.py	98.82% <0.00%> (+0.01%)	⬆️
gcovr/coverage.py	99.06% <0.00%> (+0.08%)	⬆️
gcovr/writer/html.py	95.29% <0.00%> (+0.11%)	⬆️
gcovr/merging.py	84.21% <0.00%> (+0.16%)	⬆️
... and 5 more

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