test: Add tests for required keyword (serverpod#3974)

Author: SandPod

.gitattributes

@@ -1,6 +1,7 @@
 **/generated/** linguist-generated=true
 **/protocol/** linguist-generated=true
 **/serverpod_test_tools.dart linguist-generated=true
+**/migrations/** linguist-generated=true
 
 # Compensate for too broad protocol pattern
 tools/serverpod_cli/test/generator/dart/**/protocol/** linguist-generated=false

tests/serverpod_test_client/lib/src/protocol/client.dart

@@ -1,5 +1,8 @@
 type: module
 nickname: server_test_module
 
+experimental_features:
+  all: true # Enables all experimental features
+
 client_package_path: ../serverpod_test_module_client
 server_test_tools_path: test/integration/test_tools

tests/serverpod_test_client/lib/src/protocol/required/model_with_required_field.dart

@@ -3,6 +3,9 @@ type: server
 client_package_path: ../serverpod_test_client
 server_test_tools_path: test_integration/test_tools
 
+experimental_features:
+  all: true # Enables all experimental features
+
 modules:
   serverpod_test_module:
     nickname: module

tests/serverpod_test_module/serverpod_test_module_server/config/generator.yaml

@@ -0,0 +1,18 @@
+import 'package:serverpod/serverpod.dart';
+import 'package:serverpod_test_server/src/generated/protocol.dart';
+
+class EchoRequiredFieldEndpoint extends Endpoint {
+  Future<ModelWithRequiredField> echoModel(
+    Session session,
+    ModelWithRequiredField model,
+  ) async {
+    return model;
+  }
+
+  Future<void> throwException(Session session) async {
+    throw ExceptionWithRequiredField(
+      name: 'John Doe',
+      email: 'john.doe@example.com',
+    );
+  }
+}