diff --git a/core/api/src/test/java/org/onosproject/ui/AbstractUiTest.java b/core/api/src/test/java/org/onosproject/ui/AbstractUiTest.java
index 077d132..9242863 100644
--- a/core/api/src/test/java/org/onosproject/ui/AbstractUiTest.java
+++ b/core/api/src/test/java/org/onosproject/ui/AbstractUiTest.java
@@ -27,6 +27,11 @@
     protected static final String EOL = String.format("%n");
 
     /**
+     * Tolerance for Double equality assertions.
+     */
+    protected static final double TOLERANCE = Double.MIN_VALUE * 2;
+
+    /**
      * Prints the given string to stdout.
      *
      * @param s string to print
diff --git a/core/api/src/test/java/org/onosproject/ui/topo/LayoutLocationTest.java b/core/api/src/test/java/org/onosproject/ui/topo/LayoutLocationTest.java
new file mode 100644
index 0000000..64908fd
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/ui/topo/LayoutLocationTest.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.onosproject.ui.topo;
+
+import org.junit.Test;
+import org.onosproject.ui.AbstractUiTest;
+
+import static org.junit.Assert.*;
+import static org.onosproject.ui.topo.LayoutLocation.Type;
+import static org.onosproject.ui.topo.LayoutLocation.layoutLocation;
+
+/**
+ * Unit tests for {@link LayoutLocation}.
+ */
+public class LayoutLocationTest extends AbstractUiTest {
+
+    private static final String SOME_ID = "foo";
+    private static final double SQRT2 = 1.414;
+    private static final double PI = 3.142;
+    private static final double ZERO = 0.0;
+
+    private LayoutLocation ll;
+
+    @Test
+    public void basic() {
+        ll = layoutLocation(SOME_ID, Type.GRID, SQRT2, PI);
+        print(ll);
+        assertEquals("bad id", SOME_ID, ll.id());
+        assertEquals("bad type", Type.GRID, ll.locType());
+        assertEquals("bad Y", SQRT2, ll.latOrY(), TOLERANCE);
+        assertEquals("bad X", PI, ll.longOrX(), TOLERANCE);
+        assertFalse("bad origin check", ll.isOrigin());
+    }
+
+    @Test
+    public void createGeoLocFromStringType() {
+        ll = layoutLocation(SOME_ID, "geo", SQRT2, PI);
+        assertEquals("bad type - not geo", Type.GEO, ll.locType());
+    }
+
+    @Test
+    public void createGridLocFromStringType() {
+        ll = layoutLocation(SOME_ID, "grid", SQRT2, PI);
+        assertEquals("bad type - not grid", Type.GRID, ll.locType());
+    }
+
+    @Test
+    public void zeroLatitude() {
+        ll = layoutLocation(SOME_ID, Type.GEO, ZERO, PI);
+        assertFalse("shouldn't be origin for zero latitude", ll.isOrigin());
+    }
+
+    @Test
+    public void zeroLongitude() {
+        ll = layoutLocation(SOME_ID, Type.GEO, PI, ZERO);
+        assertFalse("shouldn't be origin for zero longitude", ll.isOrigin());
+    }
+
+    @Test
+    public void origin() {
+        ll = layoutLocation(SOME_ID, Type.GRID, ZERO, ZERO);
+        assertTrue("should be origin", ll.isOrigin());
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void badType() {
+        layoutLocation(SOME_ID, "foo", ZERO, PI);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void nullId() {
+        layoutLocation(null, Type.GRID, PI, PI);
+    }
+}