[csharp] Add client options tests for collections options

Author: jimschubert

modules/swagger-codegen/src/test/java/io/swagger/codegen/csharp/CSharpClientOptionsTest.java

@@ -42,6 +42,10 @@ protected void setExpectations() {
             times = 1;
             clientCodegen.setPackageGuid(CSharpClientOptionsProvider.PACKAGE_GUID_VALUE);
             times = 1;
+            clientCodegen.setUseCollection(false);
+            times = 1;
+            clientCodegen.setReturnICollection(false);
+            times = 1;
         }};
     }
 }