Added strategy pattern test case

docs/test_cases/t00022.md

@@ -38,16 +38,15 @@ protected:
 
 class A1 : public A {
 protected:
-    void method1() override { }
-    void method2() override { }
+    void method1() override {}
+    void method2() override {}
 };
 
 class A2 : public A {
 protected:
-    void method1() override { }
-    void method2() override { }
+    void method1() override {}
+    void method2() override {}
 };
-
 }
 }
 

docs/test_cases/t00023.md

@@ -0,0 +1,65 @@
+# t00023 - Strategy pattern
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t00023_class:
+    type: class
+    glob:
+      - ../../tests/t00023/t00023.cc
+    using_namespace:
+      - clanguml::t00023
+    include:
+      namespaces:
+        - clanguml::t00023
+
+```
+## Source code
+File t00023.cc
+```cpp
+#include <memory>
+
+namespace clanguml {
+namespace t00023 {
+
+class Strategy {
+public:
+    virtual ~Strategy() = default;
+    virtual void algorithm() = 0;
+};
+
+class StrategyA : public Strategy {
+public:
+    void algorithm() override { }
+};
+
+class StrategyB : public Strategy {
+public:
+    void algorithm() override { }
+};
+
+class StrategyC : public Strategy {
+public:
+    void algorithm() override { }
+};
+
+class Context {
+public:
+    Context(std::unique_ptr<Strategy> strategy)
+        : m_strategy(std::move(strategy))
+    {
+    }
+
+    void apply() { m_strategy->algorithm(); }
+
+private:
+    std::unique_ptr<Strategy> m_strategy;
+};
+
+}
+}
+
+```
+## Generated UML diagrams
+![t00023_class](./t00023_class.png "Strategy pattern")