Added default diagram generation error for empty diagrams (#246)

tests/t90000/.clang-uml

@@ -1,3 +1,4 @@
+allow_empty_diagrams: true
 diagrams:
   t90000_class:
     type: class

tests/t90001/.clang-uml

@@ -0,0 +1,24 @@
+diagrams:
+  t90001_class:
+    type: class
+    include:
+      namespaces:
+        - no_such_namespace
+  t90001_sequence:
+    type: sequence
+    include:
+      namespaces:
+        - no_such_namespace
+    from:
+      - function: "nowhere"
+  t90001_include:
+    type: include
+    include:
+      namespaces:
+        - no_such_namespace
+  t90001_package:
+    type: package
+    include:
+      namespaces:
+        - no_such_namespace
+

tests/t90001/t90001.cc

@@ -0,0 +1,88 @@
+#include <vector>
+
+namespace clanguml {
+namespace t90001 {
+
+namespace ns1 {
+/// \brief This is class A
+class A {
+public:
+    /// Abstract foo_a
+    virtual void foo_a() = 0;
+    /// Abstract foo_c
+    virtual void foo_c() = 0;
+};
+
+/// \brief This is class B
+class B : public A {
+public:
+    virtual void foo_a() override { }
+};
+
+/// @brief This is class C - class C has a long comment
+///
+/// Vivamus integer non suscipit taciti mus etiam at primis tempor sagittis sit,
+/// euismod libero facilisi aptent elementum felis blandit cursus gravida sociis
+/// erat ante, eleifend lectus nullam dapibus netus feugiat curae curabitur est
+/// ad.
+class C : public A {
+public:
+    /// Do nothing unless override is provided
+    virtual void foo_c() override { }
+};
+
+/// This is class D
+/// which is a little like B
+/// and a little like C
+class D : public B, public C {
+public:
+    /**
+     * Forward foo_a
+     */
+    void foo_a() override
+    {
+        for (auto a : as)
+            a->foo_a();
+    }
+
+    /**
+     * Forward foo_c
+     */
+    void foo_c() override
+    {
+        for (auto a : as)
+            a->foo_c();
+    }
+
+private:
+    /// All the A pointers
+    std::vector<A *> as;
+};
+
+class E : virtual public B, public virtual C {
+public:
+    ///
+    /// Forward foo_a
+    ///
+    void foo_a() override
+    {
+        for (auto a : as)
+            a->foo_a();
+    }
+
+    ///
+    /// Forward foo_c
+    ///
+    void foo_c() override
+    {
+        for (auto a : as)
+            a->foo_c();
+    }
+
+private:
+    /// All the A pointers
+    std::vector<A *> as;
+};
+} // namespace ns1
+} // namespace t90001
+} // namespace clanguml

tests/t90001/test_case.h

@@ -0,0 +1,92 @@
+/**
+ * tests/t90001/test_case.cc
+ *
+ * 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("t90001", "[test-case][config]")
+{
+    using clanguml::error::empty_diagram_error;
+
+    auto [config, db] = load_config("t90001");
+
+    {
+        auto diagram = config.diagrams["t90001_class"];
+
+        auto model = generate_class_diagram(*db, diagram);
+
+        REQUIRE(model->is_empty());
+
+        REQUIRE(model->name() == "t90001_class");
+
+        REQUIRE_THROWS_AS(
+            generate_class_puml(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_class_json(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_class_mermaid(diagram, *model), empty_diagram_error);
+    }
+
+    {
+        auto diagram = config.diagrams["t90001_sequence"];
+
+        auto model = generate_sequence_diagram(*db, diagram);
+
+        REQUIRE(model->is_empty());
+
+        REQUIRE(model->name() == "t90001_sequence");
+
+        REQUIRE_THROWS_AS(
+            generate_sequence_puml(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_sequence_json(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_sequence_mermaid(diagram, *model), empty_diagram_error);
+    }
+
+    {
+        auto diagram = config.diagrams["t90001_package"];
+
+        auto model = generate_package_diagram(*db, diagram);
+
+        REQUIRE(model->is_empty());
+
+        REQUIRE(model->name() == "t90001_package");
+
+        REQUIRE_THROWS_AS(
+            generate_package_puml(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_package_json(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_package_mermaid(diagram, *model), empty_diagram_error);
+    }
+
+    {
+        auto diagram = config.diagrams["t90001_include"];
+
+        auto model = generate_include_diagram(*db, diagram);
+
+        REQUIRE(model->is_empty());
+
+        REQUIRE(model->name() == "t90001_include");
+
+        REQUIRE_THROWS_AS(
+            generate_include_puml(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_include_json(diagram, *model), empty_diagram_error);
+        REQUIRE_THROWS_AS(
+            generate_include_mermaid(diagram, *model), empty_diagram_error);
+    }
+}

tests/test_cases.cc

@@ -501,6 +501,7 @@ using namespace clanguml::test::matchers;
 /// Other tests (e.g. configuration file)
 ///
 #include "t90000/test_case.h"
+#include "t90001/test_case.h"
 
 ///
 /// Main test function