BAEL-2334: Adding file for the tutorial on Graph in Java

core-java/src/test/java/com/baeldung/graph/GraphTraversalUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.graph;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class GraphTraversalUnitTest {
+    @Test
+    public void givenAGraph_whenTraversingDepthFirst_thenExpectedResult() {
+        Graph graph = createGraph();
+        Assert.assertEquals("[A, D, E, B, C]", 
+            GraphTraversal.depthFirstTraversal(graph, "A").toString());
+    }
+    
+    @Test
+    public void givenAGraph_whenTraversingBreadthFirst_thenExpectedResult() {
+        Graph graph = createGraph();
+        Assert.assertEquals("[A, B, D, C, E]", 
+            GraphTraversal.breadthFirstTraversal(graph, "A").toString());
+    }
+    
+    Graph createGraph() {
+        Graph graph = new Graph();
+        graph.addVertex("A");
+        graph.addVertex("B");
+        graph.addVertex("C");
+        graph.addVertex("D");
+        graph.addVertex("E");
+        graph.addEdge("A", "B");
+        graph.addEdge("A", "D");
+        graph.addEdge("B", "C");
+        graph.addEdge("D", "C");
+        graph.addEdge("B", "E");
+        graph.addEdge("D", "E"); 
+        return graph;
+    }
+}