added SchemaTest, fixed bug in class shipment, added contains methods to class schema and enabled some tests

source/orm/query/schema.cpp

@@ -200,6 +200,22 @@ schema::const_iterator schema::end() const {
   return schema_nodes_.end();
 }
 
+size_t schema::size() const {
+  return schema_nodes_.size();
+}
+
+bool schema::empty() const {
+  return schema_nodes_.empty();
+}
+
+schema::iterator schema::find(const std::type_index &ti) {
+  return schema_nodes_.find(ti);
+}
+
+schema::const_iterator schema::find(const std::type_index &ti) const {
+  return schema_nodes_.find(ti);
+}
+
 schema::iterator schema::find(const std::string &name) {
   const auto result = repo_.basic_info(name);
   if (!result) {
@@ -218,6 +234,10 @@ schema::const_iterator schema::find(const std::string &name) const {
   return schema_nodes_.find(result->get().type_index());
 }
 
+bool schema::contains(const std::type_index &index) const {
+  return schema_nodes_.count(index) == 1;
+}
+
 void schema::dump(std::ostream &os) const {
   repo_.dump(os);
 }