CI: Skip Macos and Windows in CI tests.

The test framework uses the micropython unix port which is only
supported on linux.

Author: glenn20

.github/workflows/ci-release.yaml

@@ -23,7 +23,7 @@ jobs:
     name: Tests
     uses: glenn20/python-ci/.github/workflows/check-test-build.yaml@main
     with:
-      os: '["ubuntu-latest", "windows-latest", "macos-latest"]'
+      os: '["ubuntu-latest"]'  # CI tests only run on linux
       python-version: '["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]'
 
   publish-test:

.github/workflows/ci-test-build.yaml

@@ -17,7 +17,7 @@ jobs:
     name: CI tests (full)
     uses: glenn20/python-ci/.github/workflows/check-test-build.yaml@main
     with:
-      os: '["ubuntu-latest", "windows-latest", "macos-latest"]'
+      os: '["ubuntu-latest"]'  # CI tests only run on linux
       python-version: '["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]'
 
   publish-test:

.github/workflows/ci-test.yaml

@@ -14,5 +14,5 @@ jobs:
     name: CI tests
     uses: glenn20/python-ci/.github/workflows/check-test-build.yaml@v1
     with:  # A short test matrix for fast testing of commits
-      os: '["ubuntu-latest"]'
+      os: '["ubuntu-latest"]'  # CI tests only run on linux
       python-version: '["3.9", "3.13"]'

tests/conftest.py

@@ -35,10 +35,8 @@
     osname = platform.system()
     if osname == "Linux":
         subprocess.run("sudo apt-get install socat".split(), check=True)
-    elif osname == "Darwin":
-        subprocess.run("brew install socat".split(), check=True)
-    elif osname == "Windows":
-        raise RuntimeError("socat is not supported on Windows.")
+    else:
+        raise RuntimeError(f"Micropython unix port not supported on {osname}.")
 
 
 def pytest_addoption(parser: argparse.Namespace) -> None: