[infra] Fix CI (#1114)

Author: dcharkes

.github/workflows/native.yaml

@@ -58,7 +58,7 @@ jobs:
       - uses: nttld/setup-ndk@6a7e9c5494a25c4842ca1011f710300132eacd94
         with:
           ndk-version: r26b
-        if: ${{ matrix.sdk == 'stable' }}
+        if: ${{ matrix.sdk == 'stable' && matrix.os != 'macos' }}
 
       - run: dart pub get
 

pkgs/native_assets_builder/test_data/dart_app/bin/dart_app.dart

@@ -13,15 +13,15 @@ void main() {
 void testNativeAdd() {
   final answer = add(5, 6);
   if (answer != 5 + 6) {
-    throw 'Wrong answer';
+    throw Exception('Wrong answer');
   }
   print('add(5, 6) = $answer');
 }
 
 void testNativeSubtract() {
   final answer = subtract(5, 6);
   if (answer != 5 - 6) {
-    throw 'Wrong answer';
+    throw Exception('Wrong answer');
   }
   print('subtract(5, 6) = $answer');
 }

pkgs/native_assets_cli/example/use_dart_api/test/use_dart_api_test.dart

@@ -4,14 +4,14 @@
 
 import 'dart:ffi';
 
-import 'package:use_dart_api/use_dart_api.dart';
 import 'package:test/test.dart';
+import 'package:use_dart_api/use_dart_api.dart';
 
 void main() {
   InitDartApiDL(NativeApi.initializeApiDLData);
 
   test('use dart_api_dl.h', () {
-    const int x = 42;
+    const x = 42;
     final persistentHandle = NewPersistentHandle(x);
     HandleFromPersistent(persistentHandle);
   });