diff --git a/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java b/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
new file mode 100644
index 0000000..55e35ba
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/net/NetworkResource.java
@@ -0,0 +1,7 @@
+package org.onlab.onos.net;
+
+/**
+ * Representation of a network resource.
+ */
+public interface NetworkResource {
+}
diff --git a/core/api/src/test/java/org/onlab/onos/TestApplicationId.java b/core/api/src/test/java/org/onlab/onos/TestApplicationId.java
new file mode 100644
index 0000000..e8c0304
--- /dev/null
+++ b/core/api/src/test/java/org/onlab/onos/TestApplicationId.java
@@ -0,0 +1,31 @@
+package org.onlab.onos;
+
+import java.util.Objects;
+
+/**
+ * Test application ID.
+ */
+public class TestApplicationId implements ApplicationId {
+
+    private final String name;
+    private final short id;
+
+    public TestApplicationId(String name) {
+        this.name = name;
+        this.id = (short) Objects.hash(name);
+    }
+
+    public static ApplicationId create(String name) {
+        return new TestApplicationId(name);
+    }
+
+    @Override
+    public short id() {
+        return id;
+    }
+
+    @Override
+    public String name() {
+        return name;
+    }
+}