feat(firebase_ai): add malformedFunctionCall reason to FinishReason enum and update tests

Author: SelaseKay

packages/firebase_ai/firebase_ai/lib/src/api.dart

@@ -751,6 +751,9 @@ enum FinishReason {
   /// The candidate content was flagged for recitation reasons.
   recitation('RECITATION'),
 
+  /// The candidate content was flagged for malformed function call reasons.
+  malformedFunctionCall('MALFORMED_FUNCTION_CALL'),
+
   /// Unknown reason.
   other('OTHER');
 
@@ -770,6 +773,7 @@ enum FinishReason {
       'SAFETY' => FinishReason.safety,
       'RECITATION' => FinishReason.recitation,
       'OTHER' => FinishReason.other,
+      'MALFORMED_FUNCTION_CALL' => FinishReason.malformedFunctionCall,
       _ => throw FormatException('Unhandled FinishReason format', jsonObject),
     };
   }

packages/firebase_ai/firebase_ai/test/api_test.dart

@@ -312,6 +312,8 @@ void main() {
       expect(FinishReason.maxTokens.toJson(), 'MAX_TOKENS');
       expect(FinishReason.safety.toJson(), 'SAFETY');
       expect(FinishReason.recitation.toJson(), 'RECITATION');
+      expect(FinishReason.malformedFunctionCall.toJson(),
+          'MALFORMED_FUNCTION_CALL');
       expect(FinishReason.other.toJson(), 'OTHER');
     });
 
@@ -973,6 +975,18 @@ void main() {
                   (e) => e.message, 'message', contains('WebGroundingChunk'))));
         });
 
+        test('parses malformedFunctionCall finishReason', () {
+          final jsonResponse = {
+            'candidates': [
+              {'finishReason': 'MALFORMED_FUNCTION_CALL'}
+            ]
+          };
+          final response =
+              VertexSerialization().parseGenerateContentResponse(jsonResponse);
+          expect(response.candidates.first.finishReason,
+              FinishReason.malformedFunctionCall);
+        });
+
         test(
             'parses groundingSupport and filters out entries without a segment',
             () {