[ffigen] Add Windows CI (#399)

pkgs/ffigen/.github/workflows/test-package.yml

diff --git a/pkgs/ffigen/.github/workflows/test-package.yml b/pkgs/ffigen/.github/workflows/test-package.yml
index 1b6b494..672f339 100644
--- a/pkgs/ffigen/.github/workflows/test-package.yml
+++ b/pkgs/ffigen/.github/workflows/test-package.yml
@@ -37,7 +37,7 @@
         run: dart analyze --fatal-infos
         if: always() && steps.install.outcome == 'success'
 
-  test:
+  test-linux:
     needs: analyze
     # This job requires clang-10 which is the default on 20.04
     runs-on: ubuntu-20.04
@@ -55,7 +55,7 @@
       - name: Run VM tests
         run: dart test --platform vm
 
-  mac-test:
+  test-mac:
     needs: analyze
     runs-on: macos-latest
     steps:
@@ -76,3 +76,18 @@
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: lcov.info
+          
+  test-windows:
+    needs: analyze
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1.0
+        with:
+          sdk: stable
+      - name: Install dependencies
+        run: dart pub get
+      - name: Build test dylib and bindings
+        run: dart test/setup.dart
+      - name: Run VM tests
+        run: dart test --platform vm

pkgs/ffigen/test/native_test/native_test.dart

diff --git a/pkgs/ffigen/test/native_test/native_test.dart b/pkgs/ffigen/test/native_test/native_test.dart
index d98b686..4365214 100644
--- a/pkgs/ffigen/test/native_test/native_test.dart
+++ b/pkgs/ffigen/test/native_test/native_test.dart
@@ -40,8 +40,10 @@
       library.generateFile(file);
 
       try {
-        final actual = file.readAsStringSync();
-        final expected = File(path.join(config.output)).readAsStringSync();
+        final actual = file.readAsStringSync().replaceAll('\r', '');
+        final expected = File(path.join(config.output))
+            .readAsStringSync()
+            .replaceAll('\r', '');
         expect(actual, expected);
         if (file.existsSync()) {
           file.delete();

pkgs/ffigen/test/setup.dart

diff --git a/pkgs/ffigen/test/setup.dart b/pkgs/ffigen/test/setup.dart
index e660598..3439901 100644
--- a/pkgs/ffigen/test/setup.dart
+++ b/pkgs/ffigen/test/setup.dart
@@ -8,16 +8,14 @@
 import 'dart:async';
 import 'dart:io';
 
-import 'package:path/path.dart' as path;
-
 Future<void> _run(String subdir, String script) async {
-  final dir = path.join(path.dirname(Platform.script.path), subdir);
-  print('\nRunning $script in $dir');
-  final args = ['run', path.join(dir, script)];
+  final dir = Platform.script.resolve('$subdir/');
+  print('\nRunning $script in ${dir.toFilePath()}');
+  final args = ['run', dir.resolve(script).toFilePath()];
   final process = await Process.start(
     Platform.executable,
     args,
-    workingDirectory: dir,
+    workingDirectory: dir.toFilePath(),
   );
   unawaited(stdout.addStream(process.stdout));
   unawaited(stderr.addStream(process.stderr));

pkgs/ffigen/test/test_utils.dart

diff --git a/pkgs/ffigen/test/test_utils.dart b/pkgs/ffigen/test/test_utils.dart
index 196da1e..314f8aa 100644
--- a/pkgs/ffigen/test/test_utils.dart
+++ b/pkgs/ffigen/test/test_utils.dart
@@ -51,8 +51,10 @@
   library.generateFile(file);
 
   try {
-    final actual = file.readAsStringSync();
-    final expected = File(path.joinAll(pathToExpected)).readAsStringSync();
+    final actual = file.readAsStringSync().replaceAll('\r', '');
+    final expected = File(path.joinAll(pathToExpected))
+        .readAsStringSync()
+        .replaceAll('\r', '');
     expect(actual, expected);
     if (file.existsSync()) {
       file.delete();