From 56a9991101a41abb7d3db95072aa4881680875b6 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 6 Jun 2026 17:56:34 +0000
Subject: [PATCH 1/3] Add OS matrix (macOS, Windows) to test workflow

---
 .github/workflows/test.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 50c29da..e7069ba 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,11 +7,12 @@ permissions:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     env:
       RUST_BACKTRACE: full
     strategy:
       matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
     - uses: actions/checkout@v5

From f8de96c0aba43b19823b06775a6869b4221f5c08 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 6 Jun 2026 18:03:05 +0000
Subject: [PATCH 2/3] Make replay readonly-directory test newline-stable on
 Windows

---
 tests/test_replay_session.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/test_replay_session.py b/tests/test_replay_session.py
index 380bc88..226fb02 100644
--- a/tests/test_replay_session.py
+++ b/tests/test_replay_session.py
@@ -70,7 +70,7 @@ def test_session_does_not_save_failed_snippet():
 
 
 def test_session_supports_readonly_directory(tmp_path):
-    (tmp_path / "message.txt").write_text("hello\n")
+    (tmp_path / "message.txt").write_text("hello\n", newline="\n")
     session = MicroPythonReplaySession(readonly_dir=tmp_path, wall_timeout_seconds=None)
 
     result = session.run(

From 8d99386de3e652faecbbcf0beb6e4839cc3b94b5 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 6 Jun 2026 18:33:25 +0000
Subject: [PATCH 3/3] Stabilize readonly-directory tests across Windows
 newlines

---
 tests/test_runtime_semantics.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/test_runtime_semantics.py b/tests/test_runtime_semantics.py
index 06f1cc4..2ee9441 100644
--- a/tests/test_runtime_semantics.py
+++ b/tests/test_runtime_semantics.py
@@ -239,7 +239,7 @@ def test_instances_are_fresh_between_runs():
 
 
 def test_readonly_preopened_directory_allows_reading(tmp_path):
-    (tmp_path / "hello.txt").write_text("hello from wasi\n")
+    (tmp_path / "hello.txt").write_text("hello from wasi\n", newline="\n")
 
     assert (
         run_stdout(
@@ -255,7 +255,7 @@ def test_readonly_preopened_directory_allows_reading(tmp_path):
 
 
 def test_readonly_preopened_directory_rejects_writes(tmp_path):
-    (tmp_path / "hello.txt").write_text("hello from wasi\n")
+    (tmp_path / "hello.txt").write_text("hello from wasi\n", newline="\n")
 
     with pytest.raises(MicroPythonWasmError, match="guest exited with code 1"):
         run(