Graph

- Implemented `getValue()`

Graph (unittests)

- Added tests for `getValue()`

source/niknaks/containers.d

@@ -764,6 +764,17 @@ public class Graph(T)
         this.value = value;
     }
 
+    /** 
+     * Obtains the value associated with
+     * this graph node
+     *
+     * Returns: the value `T`
+     */
+    public T getValue()
+    {
+        return this.value;
+    }
+
     /** 
      * Appends another graph node
      * to the array of children
@@ -1054,6 +1065,10 @@ unittest
     assert(treeOfStrings.opIndex!(Graph!(string))(1) == subtree_2);
     assert(treeOfStrings.opIndex!(Graph!(string))(2) == subtree_3);
 
+    assert(treeOfStrings[0] == subtree_1.getValue());
+    assert(treeOfStrings[1] == subtree_2.getValue());
+    assert(treeOfStrings[2] == subtree_3.getValue());
+
     InclusionStratergy!(string) strat = toDelegate(&Always!(string));
     TouchStratergy!(string) touch = toDelegate(&DebugTouch!(string));