Support windows too

Author: PeterJCLaw

.gitattributes

@@ -0,0 +1,2 @@
+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.8', '3.9', '3.10', '3.11']
-        test-os: [ubuntu-latest]
+        test-os: [ubuntu-latest, windows-latest]
 
     runs-on: ${{ matrix.test-os }}
     defaults:
@@ -38,12 +38,12 @@ jobs:
         run: ./script/typing/check
 
       - name: Test
-        run: ./run-tests
+        run: SHELL=$SHELL ./run-tests
 
   action-check:
     strategy:
       matrix:
-        test-os: [ubuntu-latest]
+        test-os: [ubuntu-latest, windows-latest]
 
     runs-on: ${{ matrix.test-os }}
     defaults:

tests.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import os
 import sys
 import shutil
 import tempfile
@@ -42,7 +43,7 @@ def assertProcessSnapshot(
                     '--files',
                     *target_files,
                     '--',
-                    'bash',
+                    os.environ.get('SHELL', 'bash'),  # Cope with windows
                     str(script),
                 ],
                 capture_output=True,