diff --git a/core/api/src/test/java/org/onlab/onos/net/device/DeviceServiceAdapter.java b/core/api/src/test/java/org/onlab/onos/net/device/DeviceServiceAdapter.java
new file mode 100644
index 0000000..bfb28f6
--- /dev/null
+++ b/core/api/src/test/java/org/onlab/onos/net/device/DeviceServiceAdapter.java
@@ -0,0 +1,58 @@
+package org.onlab.onos.net.device;
+
+import org.onlab.onos.net.Device;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.MastershipRole;
+import org.onlab.onos.net.Port;
+import org.onlab.onos.net.PortNumber;
+
+import java.util.List;
+
+/**
+ * Test adapter for device service.
+ */
+public class DeviceServiceAdapter implements DeviceService {
+    @Override
+    public int getDeviceCount() {
+        return 0;
+    }
+
+    @Override
+    public Iterable<Device> getDevices() {
+        return null;
+    }
+
+    @Override
+    public Device getDevice(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public MastershipRole getRole(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public List<Port> getPorts(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public Port getPort(DeviceId deviceId, PortNumber portNumber) {
+        return null;
+    }
+
+    @Override
+    public boolean isAvailable(DeviceId deviceId) {
+        return false;
+    }
+
+    @Override
+    public void addListener(DeviceListener listener) {
+    }
+
+    @Override
+    public void removeListener(DeviceListener listener) {
+    }
+
+}
diff --git a/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java b/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java
new file mode 100644
index 0000000..54a630e
--- /dev/null
+++ b/core/api/src/test/java/org/onlab/onos/net/host/HostServiceAdapter.java
@@ -0,0 +1,65 @@
+package org.onlab.onos.net.host;
+
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.Host;
+import org.onlab.onos.net.HostId;
+import org.onlab.packet.IPAddress;
+import org.onlab.packet.MACAddress;
+import org.onlab.packet.VLANID;
+
+import java.util.Set;
+
+/**
+ * Test adapter for host service.
+ */
+public class HostServiceAdapter implements HostService {
+    @Override
+    public int getHostCount() {
+        return 0;
+    }
+
+    @Override
+    public Iterable<Host> getHosts() {
+        return null;
+    }
+
+    @Override
+    public Host getHost(HostId hostId) {
+        return null;
+    }
+
+    @Override
+    public Set<Host> getHostsByVlan(VLANID vlanId) {
+        return null;
+    }
+
+    @Override
+    public Set<Host> getHostsByMac(MACAddress mac) {
+        return null;
+    }
+
+    @Override
+    public Set<Host> getHostsByIp(IPAddress ip) {
+        return null;
+    }
+
+    @Override
+    public Set<Host> getConnectedHosts(ConnectPoint connectPoint) {
+        return null;
+    }
+
+    @Override
+    public Set<Host> getConnectedHosts(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void addListener(HostListener listener) {
+    }
+
+    @Override
+    public void removeListener(HostListener listener) {
+    }
+
+}
diff --git a/core/api/src/test/java/org/onlab/onos/net/link/LinkServiceAdapter.java b/core/api/src/test/java/org/onlab/onos/net/link/LinkServiceAdapter.java
new file mode 100644
index 0000000..fd3aa0c
--- /dev/null
+++ b/core/api/src/test/java/org/onlab/onos/net/link/LinkServiceAdapter.java
@@ -0,0 +1,66 @@
+package org.onlab.onos.net.link;
+
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.Link;
+
+import java.util.Set;
+
+/**
+ * Test adapter for link service.
+ */
+public class LinkServiceAdapter implements LinkService {
+    @Override
+    public int getLinkCount() {
+        return 0;
+    }
+
+    @Override
+    public Iterable<Link> getLinks() {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getDeviceLinks(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getDeviceEgressLinks(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getDeviceIngressLinks(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getLinks(ConnectPoint connectPoint) {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getEgressLinks(ConnectPoint connectPoint) {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getIngressLinks(ConnectPoint connectPoint) {
+        return null;
+    }
+
+    @Override
+    public Link getLink(ConnectPoint src, ConnectPoint dst) {
+        return null;
+    }
+
+    @Override
+    public void addListener(LinkListener listener) {
+    }
+
+    @Override
+    public void removeListener(LinkListener listener) {
+    }
+
+}
diff --git a/core/api/src/test/java/org/onlab/onos/net/topology/TopologyServiceAdapter.java b/core/api/src/test/java/org/onlab/onos/net/topology/TopologyServiceAdapter.java
new file mode 100644
index 0000000..cfc22e0
--- /dev/null
+++ b/core/api/src/test/java/org/onlab/onos/net/topology/TopologyServiceAdapter.java
@@ -0,0 +1,77 @@
+package org.onlab.onos.net.topology;
+
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.Path;
+
+import java.util.Set;
+
+/**
+ * Test adapter for topology service.
+ */
+public class TopologyServiceAdapter implements TopologyService {
+    @Override
+    public Topology currentTopology() {
+        return null;
+    }
+
+    @Override
+    public boolean isLatest(Topology topology) {
+        return false;
+    }
+
+    @Override
+    public TopologyGraph getGraph(Topology topology) {
+        return null;
+    }
+
+    @Override
+    public Set<TopologyCluster> getClusters(Topology topology) {
+        return null;
+    }
+
+    @Override
+    public TopologyCluster getCluster(Topology topology, ClusterId clusterId) {
+        return null;
+    }
+
+    @Override
+    public Set<DeviceId> getClusterDevices(Topology topology, TopologyCluster cluster) {
+        return null;
+    }
+
+    @Override
+    public Set<Link> getClusterLinks(Topology topology, TopologyCluster cluster) {
+        return null;
+    }
+
+    @Override
+    public Set<Path> getPaths(Topology topology, DeviceId src, DeviceId dst) {
+        return null;
+    }
+
+    @Override
+    public Set<Path> getPaths(Topology topology, DeviceId src, DeviceId dst, LinkWeight weight) {
+        return null;
+    }
+
+    @Override
+    public boolean isInfrastructure(Topology topology, ConnectPoint connectPoint) {
+        return false;
+    }
+
+    @Override
+    public boolean isBroadcastPoint(Topology topology, ConnectPoint connectPoint) {
+        return false;
+    }
+
+    @Override
+    public void addListener(TopologyListener listener) {
+    }
+
+    @Override
+    public void removeListener(TopologyListener listener) {
+    }
+
+}