Added package diagram test case with C++20 module partitions dependencies

src/common/model/path.cc

@@ -0,0 +1,35 @@
+/**
+ * @file src/common/model/path.cc
+ *
+ * Copyright (c) 2021-2023 Bartek Kryza <bkryza@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "path.h"
+
+namespace clanguml::common::model {
+
+std::string to_string(const path_type pt)
+{
+    switch (pt) {
+    case path_type::kModule:
+        return "module";
+    case path_type::kNamespace:
+        return "namespace";
+    case path_type::kFilesystem:
+        return "directory";
+    }
+}
+
+} // namespace clanguml::common::model

src/common/model/path.h

@@ -37,6 +37,8 @@ enum class path_type {
     kModule      /*!< Module path */
 };
 
+std::string to_string(path_type pt);
+
 /**
  * @brief Diagram path
  *
@@ -135,7 +137,8 @@ public:
             return *this;
 
         if (path_type_ != right.path_type_)
-            throw std::runtime_error("");
+            throw std::runtime_error(
+                "Cannot assign a path to a path with another path type.");
 
         path_type_ = right.path_type_;
         path_ = right.path_;
@@ -225,6 +228,7 @@ public:
     path operator|(const path &right) const
     {
         path res{*this};
+        res.path_type_ = right.path_type_;
         res.append(right);
         return res;
     }