diff --git a/core/trivial/src/test/java/org/onlab/onos/net/trivial/topology/impl/DefaultTopologyTest.java b/core/trivial/src/test/java/org/onlab/onos/net/trivial/topology/impl/DefaultTopologyTest.java
new file mode 100644
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--- /dev/null
+++ b/core/trivial/src/test/java/org/onlab/onos/net/trivial/topology/impl/DefaultTopologyTest.java
@@ -0,0 +1,111 @@
+package org.onlab.onos.net.trivial.topology.impl;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.Device;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.Path;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.provider.ProviderId;
+import org.onlab.onos.net.topology.ClusterId;
+import org.onlab.onos.net.topology.GraphDescription;
+import org.onlab.onos.net.topology.LinkWeight;
+import org.onlab.onos.net.topology.TopologyCluster;
+import org.onlab.onos.net.topology.TopologyEdge;
+
+import java.util.Set;
+
+import static com.google.common.collect.ImmutableSet.of;
+import static org.junit.Assert.*;
+import static org.onlab.onos.net.DeviceId.deviceId;
+import static org.onlab.onos.net.PortNumber.portNumber;
+import static org.onlab.onos.net.trivial.topology.impl.SimpleTopologyManagerTest.device;
+import static org.onlab.onos.net.trivial.topology.impl.SimpleTopologyManagerTest.link;
+
+/**
+ * Test of the default topology implementation.
+ */
+public class DefaultTopologyTest {
+
+    public static final ProviderId PID = new ProviderId("foo.bar");
+
+    public static final DeviceId D1 = deviceId("of:1");
+    public static final DeviceId D2 = deviceId("of:2");
+    public static final DeviceId D3 = deviceId("of:3");
+    public static final DeviceId D4 = deviceId("of:4");
+    public static final DeviceId D5 = deviceId("of:5");
+
+    public static final PortNumber P1 = portNumber(1);
+    public static final PortNumber P2 = portNumber(2);
+
+    public static final LinkWeight WEIGHT = new LinkWeight() {
+        @Override
+        public double weight(TopologyEdge edge) {
+            return edge.src().deviceId().equals(D4) ||
+                    edge.dst().deviceId().equals(D4) ? 2.0 : 1.0;
+        }
+    };
+
+    private DefaultTopology dt;
+
+    @Before
+    public void setUp() {
+        long now = System.currentTimeMillis();
+        Set<Device> devices = of(device("1"), device("2"),
+                                 device("3"), device("4"),
+                                 device("5"));
+        Set<Link> links = of(link("1", 1, "2", 1), link("2", 1, "1", 1),
+                             link("3", 2, "2", 2), link("2", 2, "3", 2),
+                             link("1", 3, "4", 3), link("4", 3, "1", 3),
+                             link("3", 4, "4", 4), link("4", 4, "3", 4));
+        GraphDescription graphDescription =
+                new DefaultGraphDescription(now, devices, links);
+
+        dt = new DefaultTopology(PID, graphDescription);
+        assertEquals("incorrect supplier", PID, dt.providerId());
+        assertEquals("incorrect time", now, dt.time());
+        assertEquals("incorrect device count", 5, dt.deviceCount());
+        assertEquals("incorrect link count", 8, dt.linkCount());
+        assertEquals("incorrect cluster count", 2, dt.clusterCount());
+        assertEquals("incorrect broadcast set size", 6,
+                     dt.broadcastSetSize(ClusterId.clusterId(0)));
+    }
+
+    @Test
+    public void pathRelated() {
+        Set<Path> paths = dt.getPaths(D1, D2);
+        assertEquals("incorrect path count", 1, paths.size());
+
+        paths = dt.getPaths(D1, D3);
+        assertEquals("incorrect path count", 2, paths.size());
+
+        paths = dt.getPaths(D1, D5);
+        assertTrue("no paths expected", paths.isEmpty());
+
+        paths = dt.getPaths(D1, D3, WEIGHT);
+        assertEquals("incorrect path count", 1, paths.size());
+    }
+
+    @Test
+    public void pointRelated() {
+        assertTrue("should be infrastructure point",
+                   dt.isInfrastructure(new ConnectPoint(D1, P1)));
+        assertFalse("should not be infrastructure point",
+                    dt.isInfrastructure(new ConnectPoint(D1, P2)));
+    }
+
+    @Test
+    public void clusterRelated() {
+        Set<TopologyCluster> clusters = dt.getClusters();
+        assertEquals("incorrect cluster count", 2, clusters.size());
+
+        TopologyCluster c = dt.getCluster(D1);
+        Set<DeviceId> devs = dt.getClusterDevices(c);
+        assertEquals("incorrect cluster device count", 4, devs.size());
+        assertTrue("cluster should contain D2", devs.contains(D2));
+        assertFalse("cluster should not contain D5", devs.contains(D5));
+    }
+
+}