From 1f7afd12e1dae7b72129d38c73309c24cb47cf8a Mon Sep 17 00:00:00 2001
From: Jacob Steves <jacob.steves@shopify.com>
Date: Thu, 12 Nov 2026 13:34:52 -0500
Subject: [PATCH 1/2] Run CI tests and builds on Linux, Windows, and macOS

---
 .github/workflows/ci.yml     | 14 ++++++++++++--
 integration_tests/src/lib.rs | 10 ++++++++--
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9b1e8f8..ed2075e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,14 +22,24 @@ jobs:
         run: cargo clippy --tests
 
   test:
-    runs-on: ubuntu-latest
+    name: test (${{ matrix.os }})
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Run tests
         run: cargo test
 
   build:
-    runs-on: ubuntu-latest
+    name: build (${{ matrix.os }})
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Build
diff --git a/integration_tests/src/lib.rs b/integration_tests/src/lib.rs
index 9203edb..12892eb 100644
--- a/integration_tests/src/lib.rs
+++ b/integration_tests/src/lib.rs
@@ -46,7 +46,10 @@ fn build_example(name: &str) -> Result<()> {
 }
 
 static FUNCTION_RUNNER_PATH: LazyLock<anyhow::Result<PathBuf>> = LazyLock::new(|| {
-    let path = workspace_root().join(format!("tmp/function-runner-{FUNCTION_RUNNER_VERSION}"));
+    let path = workspace_root().join(format!(
+        "tmp/function-runner-{FUNCTION_RUNNER_VERSION}{}",
+        std::env::consts::EXE_SUFFIX
+    ));
 
     if !path.exists() {
         std::fs::create_dir_all(workspace_root().join("tmp"))?;
@@ -57,7 +60,10 @@ static FUNCTION_RUNNER_PATH: LazyLock<anyhow::Result<PathBuf>> = LazyLock::new(|
 });
 
 static TRAMPOLINE_PATH: LazyLock<anyhow::Result<PathBuf>> = LazyLock::new(|| {
-    let path = workspace_root().join(format!("tmp/trampoline-{TRAMPOLINE_VERSION}"));
+    let path = workspace_root().join(format!(
+        "tmp/trampoline-{TRAMPOLINE_VERSION}{}",
+        std::env::consts::EXE_SUFFIX
+    ));
     if !path.exists() {
         std::fs::create_dir_all(workspace_root().join("tmp"))?;
         download_trampoline(&path)?;

From b725381ac5ff7a8e83625d2ec8e2b92e35c0a4ee Mon Sep 17 00:00:00 2001
From: Jacob Steves <jacob.steves@shopify.com>
Date: Thu, 12 Nov 2026 13:43:37 -0500
Subject: [PATCH 2/2] Make panic test expectation platform-aware for Windows

---
 integration_tests/tests/integration_test.rs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/integration_tests/tests/integration_test.rs b/integration_tests/tests/integration_test.rs
index 3f3f97d..f54d579 100644
--- a/integration_tests/tests/integration_test.rs
+++ b/integration_tests/tests/integration_test.rs
@@ -107,10 +107,19 @@ fn test_example_with_panic() -> Result<()> {
     let err = run_example(path.clone(), "target_panic", input)
         .unwrap_err()
         .to_string();
-    let expected_err =
-        "Function runner returned non-zero exit code: exit status: 1, logs: panicked at example_with_targets/src/main.rs:57:5:\nSomething went wrong\nerror while executing at wasm backtrace:";
+    // `ExitStatus` is displayed differently on Windows, and the panic location
+    // uses the platform's path separator.
+    let exit_status = if cfg!(windows) {
+        "exit code: 1"
+    } else {
+        "exit status: 1"
+    };
+    let sep = std::path::MAIN_SEPARATOR;
+    let expected_err = format!(
+        "Function runner returned non-zero exit code: {exit_status}, logs: panicked at example_with_targets{sep}src{sep}main.rs:57:5:\nSomething went wrong\nerror while executing at wasm backtrace:"
+    );
     assert!(
-        err.contains(expected_err),
+        err.contains(&expected_err),
         "Expected error message to contain:\n`{expected_err}`\nbut was:\n`{err}`"
     );
     Ok(())