CI: Run tests in Cygwin for Cygwin CI

.github/workflows/tests-cygwin.yml

@@ -14,34 +14,50 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python:
-          - '3.10'
+        python-minor:
+          - '9'
 
     steps:
+      - name: Tell git to use proper newlines
+        run: git config --global core.autocrlf input
+
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: Set up target Python
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ matrix.python }}
-
       - name: Setup Cygwin
         uses: cygwin/cygwin-install-action@v2
+        with:
+          packages: >-
+            python3${{ matrix.python-minor }}
+            python3${{ matrix.python-minor }}-pip
+            cmake make ninja gcc-core gcc-g++ git
 
       - name: Install nox
+        shell: bash.exe -eo pipefail -o igncr "{0}"
+        env:
+          PATH: "/bin:/usr/bin:/usr/local/bin:/usr/lib/lapack"
+          TMP: "/tmp"
+          TEMP: "/tmp"
         run: |
-            python -m pip install nox
+            /usr/bin/python -m pip install nox
             nox --version
 
       - name: Run tests
-        run: nox -s test-${{ matrix.python }}
+        shell: bash.exe -eo pipefail -o igncr "{0}"
+        env:
+          PATH: "/bin:/usr/bin:/usr/local/bin:/usr/lib/lapack"
+          CHERE_INVOKING: 1
+          TMP: "/tmp"
+          TEMP: "/tmp"
+        run: |
+          cd "${GITHUB_WORKSPACE}"
+          nox -s test-3.${{ matrix.python-minor }}
 
       - name: Send coverage report
         uses: codecov/codecov-action@v1
         env:
-          PYTHON: cygwin-${{ matrix.python }}
+          PYTHON: cygwin-3.${{ matrix.python-minor }}
         with:
           flags: tests
           env_vars: PYTHON
-          name: cygwin-${{ matrix.python }}
+          name: cygwin-3.${{ matrix.python-minor }}

tests/test_wheel.py

@@ -39,6 +39,12 @@
 elif platform.system() == 'Darwin':
     SHARED_LIB_EXT = 'dylib'
 elif platform.system() == 'Windows':
+    # I'm using import library (link-time) rather than dynamic library (run-time)
+    # because that's what was already here for Cygwin
+    SHARED_LIB_EXT = 'lib'
+elif platform.system().startswith("CYGWIN"):
+    # I'm using import library (link-time) rather than dynamic library (run-time)
+    # because that's what was already here for Cygwin
     SHARED_LIB_EXT = 'dll.a'
 else:
     raise NotImplementedError(f'Unknown system: {platform.system()}')