add test for nativeCrash

Author: martinhaintz

flutter/lib/src/sentry_flutter.dart

@@ -275,7 +275,7 @@ mixin SentryFlutter {
 
   /// Use `nativeCrash()` to crash the native implementation and test/debug the crash reporting for native code.
   /// This should not be used in production code.
-  /// Only for Android and iOS
+  /// Only for Android, iOS and macOS
   static Future<void> nativeCrash() {
     if (_native == null) {
       _logNativeIntegrationNotAvailable("nativeCrash");

flutter/test/sentry_native_channel_test.dart

@@ -302,6 +302,15 @@ void main() {
 
         verify(channel.invokeMethod('resumeAppHangTracking'));
       });
+
+      test('nativeCrash', () async {
+        when(channel.invokeMethod('nativeCrash'))
+            .thenAnswer((_) => Future.value());
+
+        await sut.nativeCrash();
+
+        verify(channel.invokeMethod('nativeCrash'));
+      });
     });
   }
 }