Make github actions run the python unit tests (#2517)

* Make github actions run the python unit tests

* why don't the pyhton tests run?

* run python tests

* don't run tests twice

* don't run cmake tests twice

* rename the CMake test to C++ since it's testing the C++ part of the library

And the python build uses cmake too, which makes the naming somewhat
confusing

* work around macos

* oops, fix spelling error

.github/workflows/build_cpp.yml

@@ -1,8 +1,12 @@
-name: CMake
+name: C++ 
 
 on:
-  pull_request:
   push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
 
 env:
   config: Release

.github/workflows/build_python.yml

@@ -1,28 +1,42 @@
 name: Python
 
 on:
-  pull_request:
   push:
-
-env:
-  config: Release
-  build_dir: build
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
 
 defaults:
   run:
     shell: bash
 
 jobs:
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: ['ubuntu-latest', 'windows-latest', 'macos-latest']
-
+  Windows:    
+    runs-on: 'windows-latest'
     steps:
     - uses: actions/checkout@v2
-
     - name: Build
-      working-directory: ${{ github.workspace }}
       run: python setup.py build
+    - name: Test
+      run: python setup.py test 
+
+  Ubuntu:    
+    runs-on: 'ubuntu-latest'
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: python setup.py build
+    - name: Test
+      run: python setup.py test 
+
+  # we don't run python setup.py test on MacOS because there is some system
+  # issue that prevents it from running at all.
+  MacOS:    
+    runs-on: 'macos-latest'
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: python setup.py build
+