Updated test cases documentation

docs/test_cases/t00019.md

@@ -22,21 +22,25 @@ diagrams:
 
 ```
 ## Source code
-File t00019.cc
+File t00019_layer2.h
 ```cpp
-#include "t00019_base.h"
-#include "t00019_layer1.h"
-#include "t00019_layer2.h"
-#include "t00019_layer3.h"
-
-#include <memory>
+#pragma once
 
 namespace clanguml {
 namespace t00019 {
 
-class A {
-public:
-    std::unique_ptr<Layer1<Layer2<Layer3<Base>>>> layers;
+template <typename LowerLayer> class Layer2 : public LowerLayer {
+
+    using LowerLayer::LowerLayer;
+
+    using LowerLayer::m1;
+
+    using LowerLayer::m2;
+
+    int all_calls_count() const
+    {
+        return LowerLayer::m1_calls() + LowerLayer::m2_calls();
+    }
 };
 }
 }
@@ -94,6 +98,26 @@ template <typename LowerLayer> class Layer1 : public LowerLayer {
 }
 }
 
+```
+File t00019.cc
+```cpp
+#include "t00019_base.h"
+#include "t00019_layer1.h"
+#include "t00019_layer2.h"
+#include "t00019_layer3.h"
+
+#include <memory>
+
+namespace clanguml {
+namespace t00019 {
+
+class A {
+public:
+    std::unique_ptr<Layer1<Layer2<Layer3<Base>>>> layers;
+};
+}
+}
+
 ```
 File t00019_layer3.h
 ```cpp
@@ -131,30 +155,6 @@ private:
 }
 }
 
-```
-File t00019_layer2.h
-```cpp
-#pragma once
-
-namespace clanguml {
-namespace t00019 {
-
-template <typename LowerLayer> class Layer2 : public LowerLayer {
-
-    using LowerLayer::LowerLayer;
-
-    using LowerLayer::m1;
-
-    using LowerLayer::m2;
-
-    int all_calls_count() const
-    {
-        return LowerLayer::m1_calls() + LowerLayer::m2_calls();
-    }
-};
-}
-}
-
 ```
 ## Generated UML diagrams
 ![t00019_class](./t00019_class.png "Layercake pattern")