Pytest changes for macOS.

[ejtovar]

Mandatory Checklist

Please ensure that the following criteria are met:

• [x ] Title of pull request describes the changes/features
• [x ] Request at least 2 reviewers
• [x ] If new files are being added, the files are no larger than 100kB. Post the file sizes.
• [x] Code coverage did not decrease. If this is a bug fix, a test should cover that bug fix. If a new feature is added, a test should be made to cover that feature.
• [x] New features have appropriate documentation strings (readable by sphinx)
• [x] Contributor has read and agreed with CONTRIBUTING.md and has added themselves to CONTRIBUTORS.md

As a general rule of thumb, try to follow PEP8 guidelines.

Description

1. Changed the pytest command in .travis.yml file to allow the tests to runon macOS.
2. Added a test-macos command in the makefile that runs the basic tests suite.
3. In a few tests, I added the command @pytest.mark.skipif(sys.platform == "darwin", reason="does not run on macOS") to skip particular tests when using macOS.
4. Fixed a typo in test_CLSVOF_discICs.py. Changed class name TestSWEs to TestCLSVOF

[codecov[bot]]

Codecov Report

Merging #1178 into master will increase coverage by 0.01%. The diff coverage is 98.18%.

@@            Coverage Diff             @@
##           master    #1178      +/-   ##
==========================================
+ Coverage   50.70%   50.72%   +0.01%     
==========================================
  Files         541      541              
  Lines      109390   109397       +7     
==========================================
+ Hits        55466    55489      +23     
+ Misses      53924    53908      -16     

Impacted Files	Coverage Δ
proteus/tests/mesh_tests/test_quads.py	72.38% <83.33%> (+1.09%)	:arrow_up:
proteus/mprans/MoveMesh.py	86.35% <100.00%> (ø)
proteus/mprans/SW2DCV.py	90.69% <100.00%> (ø)
proteus/tests/AddedMass/test_addedmass3D.py	87.71% <100.00%> (+0.21%)	:arrow_up:
...BernsteinPolynomials/poisson_eqn/test_bernstein.py	97.82% <100.00%> (+0.02%)	:arrow_up:
...oteus/tests/CLSVOF/disc_ICs/test_CLSVOF_discICs.py	95.08% <100.00%> (ø)
proteus/tests/FSI/test_FSI.py	46.99% <100.00%> (+0.29%)	:arrow_up:
proteus/tests/ci/test_poisson.py	95.19% <100.00%> (ø)
proteus/tests/test_analyticalSolutions.py	99.62% <100.00%> (ø)
proteus/tests/wave_tests/test_wavetools.py	99.25% <100.00%> (ø)
... and 4 more

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[cekees]

Thanks @ejtovar . I think this is close enough that you can just relax the 4 remaining tests so that they pass (I guess they are already passing on your macbook?). We're just asking for too much precision on these, I think: FAILED proteus/tests/test_analyticalSolutions.py::test_diffusionSin1D FAILED proteus/tests/test_analyticalSolutions.py::test_diffusionSin2D FAILED proteus/tests/test_analyticalSolutions.py::test_STflowSphere_P FAILED proteus/tests/cylinder2D/ibm_rans2p_3D/test_cylinder3D_ibm_rans2p.py::Test_ibm::test_ex2

[ejtovar]

@cekees No they're not passing on my macbook. They did seem like a "precision" type failures which is why I didn't skip them.