Add a github action to run a sample build to check output

.github/workflows/sample_build.yml

@@ -0,0 +1,28 @@
+name: Sample build
+
+on: [push, pull_request]
+
+jobs:
+  build_wheels:
+    name: Build wheels on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v2
+        name: Install Python
+        with:
+          python-version: '3.7'
+
+      - name: Generate sample project
+        run: |
+          python -m test.test_projects test_0_basic.basic_project sample_project
+
+      - name: Build wheels
+        run: |
+          cd sample_project
+          python -m cibuildwheel --output-dir wheelhouse

test/test_projects/__main__.py

@@ -11,21 +11,28 @@ def main():
         prog="python -m test.test_projects",
         description='Generate a test project to check it out'
     )
+    parser.add_argument('--open', action='store_true', help='''
+        Open the generated project in a file explorer
+    ''')
     parser.add_argument('PROJECT', help='''
         Python path to a project object. E.g. test.test_0_basic.basic_project
     ''')
+    parser.add_argument('OUTPUT', nargs='?', help='''
+        Path to output dir. If no dir is passed, a tempdir will be generated.
+    ''')
     options = parser.parse_args()
 
     module, _, name = options.PROJECT.rpartition('.')
 
     project = getattr(importlib.import_module(module), name)
 
-    project_dir = Path(tempfile.mkdtemp())
+    project_dir = Path(options.OUTPUT or tempfile.mkdtemp())
     project.generate(project_dir)
 
     print('Project generated at', project_dir)
     print()
 
+    if options.open:
         if sys.platform == 'darwin':
             subprocess.check_call(['open', '--', project_dir])
         elif sys.platform == 'linux2':