ci: run tests on windows

.github/workflows/ci-tests.yml

@@ -45,6 +45,9 @@ jobs:
             # On macos, the up-to-date git may not be first on the path
             # N.B. setting includes a final ":", to simplify the path setting command
             gitpath-prepend: "/opt/homebrew/bin:"
+          - os: windows-latest
+            version: py313
+            platform: win
     steps:
     - name: "Checkout"
       uses: actions/checkout@v4
@@ -105,6 +108,21 @@ jobs:
         path: ${{ github.workspace }}/.tox
         key: ${{ runner.os }}-tox-${{ env.ENV_NAME }}-${{ matrix.version }}-p${{ env.CACHE_PERIOD }}-b${{ env.CACHE_BUILD }}-${{ hashFiles(env.TOX_INI) }}
 
+    # setuptools can't find shared library installed by conda on windows
+    # so we need to prepare environment variables for it
+    - name: Export environment variables for UDUNITS2 lookup
+      if: runner.os == 'Windows'
+      uses: actions/github-script@v7
+      with:
+        script: |
+          const path = require('path')
+
+          const base = path.join('.tox/${{ matrix.version }}-${{ matrix.platform }}-test')
+
+          core.exportVariable('UDUNITS2_INCDIR', path.join(base, 'Library/include/'));
+          core.exportVariable('UDUNITS2_LIBDIR', path.join(base, 'Library/lib/'));
+          core.exportVariable('UDUNITS2_XML_PATH', path.join(base, 'Library/share/udunits/udunits2.xml'));
+
     - name: "Run ${{ matrix.os }} on ${{ matrix.version}} tests"
       run: |
         export PATH=${{ matrix.gitpath-prepend }}$PATH

cf_units/tests/test_coding_standards.py

@@ -99,7 +99,7 @@ def test_license_headers(self):
                 and full_fname.is_file()
                 and not any(fnmatch(fname, pat) for pat in exclude_patterns)
             ):
-                with open(full_fname) as fh:
+                with open(full_fname, encoding="utf-8") as fh:
                     content = fh.read()
                     if not content.startswith(LICENSE_TEMPLATE):
                         print(

tox.ini

@@ -19,7 +19,7 @@ conda_deps =
 description =
     Create explicit environment specification conda lock files for cf-units dependencies.
 platform =
-    linux|darwin
+    linux|darwin|win32
 setenv =
     LOCKDIR = {toxinidir}{/}requirements{/}locks
     TMPFILE = {envtmpdir}{/}cf-units.yml
@@ -50,6 +50,9 @@ description =
     Perform cf-units unit/integration tests.
 passenv =
     CYTHON_COVERAGE
+    UDUNITS2_INCDIR
+    UDUNITS2_LIBDIR
+    UDUNITS2_XML_PATH
 usedevelop =
     true
 commands =