added a test for SCC construction

Author: StevenArzt

tests/soot/toolkits/graph/SCCFastTest.java

@@ -0,0 +1,42 @@
+package soot.toolkits.graph;
+
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SCCFastTest {
+
+	@Test
+	public void testSCC1() {
+		Node rootNode = new Node(0);
+		Node left0 = new Node(1);
+		Node left1 = new Node(2);
+		Graph g = new Graph(rootNode);
+		rootNode.addkid(left0);
+		rootNode.addkid(left1);
+		StronglyConnectedComponentsFast<Node> scc = new StronglyConnectedComponentsFast<Node>(g);
+		Assert.assertTrue(scc.getTrueComponents().isEmpty());
+	}
+
+	@Test
+	public void testSCC2() {
+		Node rootNode = new Node(0);
+		Node left0 = new Node(1);
+		Node left1 = new Node(2);
+		Node left0a = new Node(3);
+		Node left0b = new Node(4);
+		Graph g = new Graph(rootNode);
+		rootNode.addkid(left0);
+		rootNode.addkid(left1);
+		left0.addkid(left0a);
+		left0a.addkid(left0b);
+		left0b.addkid(left0);
+		StronglyConnectedComponentsFast<Node> scc = new StronglyConnectedComponentsFast<Node>(g);
+		Assert.assertEquals(1, scc.getTrueComponents().size());
+		
+		List<Node> nodes = scc.getTrueComponents().get(0);
+		Assert.assertEquals(3, nodes.size());
+	}
+	
+}