test: add test for nested directives

Author: javier-godoy

src/test/java/com/flowingcode/vaadin/addons/demo/it/ConditionalSourceCodeViewerIT.java

@@ -47,4 +47,8 @@ public void testConditionElif() {
     assertEquals(expected(), open(VAADIN_VERSION));
   }
 
+  @Test
+  public void testConditionNested() {
+    assertEquals(expected(), open(VAADIN_VERSION));
+  }
 }

src/test/resources/com/flowingcode/vaadin/addons/demo/it/ConditionNested.java

@@ -0,0 +1,17 @@
+class MyClass {
+  // #if vaadin eq 23
+  // show-source 23
+  // #if vaadin eq 23.4
+  // show-source 23, 23.4
+  // #endif
+  // show-source 23
+  // #endif
+  
+  // #if vaadin eq 22
+  // show-source 22
+  // #if vaadin eq 23.4
+  // show-source 22, 23.4
+  // #endif
+  // show-source 22
+  // #endif
+}

src/test/resources/com/flowingcode/vaadin/addons/demo/it/ConditionNested.txt

@@ -0,0 +1,6 @@
+class MyClass {
+  23
+  23, 23.4
+  23
+  
+}