Add tests for object operators (+= and -=)

Author: d-frey

src/test/json/object_operators.cc

@@ -0,0 +1,38 @@
+// Copyright (c) 2015-2016 Dr. Colin Hirsch and Daniel Frey
+// Please see LICENSE for license or visit https://github.com/taocpp/json/
+
+#include "test.hh"
+
+#include <tao/json/from_string.hh>
+
+namespace tao
+{
+   namespace json
+   {
+      void unit_test()
+      {
+         value v = empty_object;
+         TEST_ASSERT( v.get_object().size() == 0 );
+         v += {};
+         TEST_ASSERT( v.get_object().size() == 0 );
+         v += { { "foo", 1 } };
+         TEST_ASSERT( v.get_object().size() == 1 );
+         v += { { "bar", 2 }, { "baz", 3 } };
+         TEST_ASSERT( v.get_object().size() == 3 );
+         TEST_THROWS( v += { { "foo", 42 } } );
+         TEST_THROWS( v -= { "what?" } );
+         v -= {};
+         TEST_ASSERT( v.get_object().size() == 3 );
+         v -= { "bar" };
+         TEST_THROWS( v -= { "bar" } );
+         TEST_ASSERT( v.get_object().size() == 2 );
+         v -= { "foo", "baz" };
+         TEST_ASSERT( v.get_object().size() == 0 );
+         TEST_THROWS( v -= { "baz" } );
+      }
+
+   } // json
+
+} // tao
+
+#include "main.hh"