Added test case for sequence diagram with nested classes (#287)

tests/t20054/test_case.h

@@ -0,0 +1,35 @@
+/**
+ * tests/t20054/test_case.h
+ *
+ * Copyright (c) 2021-2024 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.
+ */
+
+TEST_CASE("t20054")
+{
+    using namespace clanguml::test;
+    using namespace std::string_literals;
+
+    auto [config, db, diagram, model] =
+        CHECK_SEQUENCE_MODEL("t20054", "t20054_sequence");
+
+    CHECK_SEQUENCE_DIAGRAM(config, diagram, *model, [](const auto &src) {
+        REQUIRE(MessageOrder(src,
+            {{"tmain()", "A", "a()"}, {"A", "A::AA", "aa()"},
+                {"A::AA", "A::AA::AAA", "aaa()"},
+
+                {Entrypoint{}, "A::AA", "bb()"},
+                {"A::AA", "A::AA::BBB", "bbb()"}}));
+    });
+}