diff --git a/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.js b/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.js
index cbb1256e..c6b87736 100644
--- a/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.js
+++ b/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.js
@@ -124,6 +124,18 @@
       };
     }
 
+    /**
+     * @description Get the list of transitions originating
+     * from a specified source state.
+     *
+     * @param {string} sourceState – Name of source state
+     * @return {object[]} List of transition objects. Each
+     *   transition object contains the following fields:
+     *     source: Name of source state.
+     *     target: Name of target state.
+     *     verb: Verb used to accomplish the transition.
+     *     label: String description of the transition.
+     */
     this.getTransitions = function(sourceState) {
       var transitions = [];
       if (states.hasOwnProperty(sourceState)) {
@@ -134,5 +146,14 @@
       }
       return transitions;
     };
+
+    /**
+     * @description Get a list of known states.
+     *
+     * @return {string[]} List of known node states.
+     */
+    this.getKnownStates = function() {
+      return Object.keys(states);
+    };
   }
 }());
diff --git a/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.spec.js b/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.spec.js
new file mode 100644
index 00000000..165fe16c
--- /dev/null
+++ b/ironic_ui/static/dashboard/admin/ironic/node-state-transition.service.spec.js
@@ -0,0 +1,179 @@
+/**
+ * Copyright 2017 Cray Inc
+ *
+ * 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.
+ */
+
+(function() {
+  "use strict";
+
+  /**
+   * @description Unit tests for the Ironic node state transition service
+   */
+
+  describe(
+    'horizon.dashboard.admin.ironic.node-state-transition.service',
+
+    function() {
+      var nodeStateTransitionService;
+
+      beforeEach(module('horizon.dashboard.admin.ironic'));
+
+      beforeEach(inject(function($injector) {
+        nodeStateTransitionService = $injector.get(
+          'horizon.dashboard.admin.ironic.node-state-transition.service');
+      }));
+
+      it('nodeStateTransitionService', function() {
+        expect(nodeStateTransitionService).toBeDefined();
+      });
+
+      it('known states', function() {
+        var knownStates = ['enroll',
+                           'manageable',
+                           'active',
+                           'available',
+                           'adopt failed',
+                           'clean failed',
+                           'inspect failed',
+                           'clean wait',
+                           'deploy failed',
+                           'error'].sort();
+        expect(nodeStateTransitionService.getKnownStates().sort())
+          .toEqual(knownStates);
+      });
+
+      function validateTransition(transition) {
+        var serviceTransitions =
+          nodeStateTransitionService.getTransitions(transition.source);
+        for (var i = 0; i < serviceTransitions.length; i++) {
+          var serviceTransition = serviceTransitions[i];
+          if (serviceTransition.source === transition.source &&
+              serviceTransition.target === transition.target &&
+              serviceTransition.verb === transition.verb) {
+            expect(serviceTransition.label).toBeDefined();
+            return true;
+          }
+        }
+        return false;
+      }
+
+      it('enroll - manage - manageable', function() {
+        expect(validateTransition({source: 'enroll',
+                                   target: 'manageable',
+                                   verb: 'manage'})).toBe(true);
+      });
+
+      it('manageable - adopt - active', function() {
+        expect(validateTransition({source: 'manageable',
+                                   target: 'active',
+                                   verb: 'adopt'})).toBe(true);
+      });
+
+      it('manageable - provide - available', function() {
+        expect(validateTransition({source: 'manageable',
+                                   target: 'available',
+                                   verb: 'provide'})).toBe(true);
+      });
+
+      it('manageable - inspect - manageable', function() {
+        expect(validateTransition({source: 'manageable',
+                                   target: 'manageable',
+                                   verb: 'inspect'})).toBe(true);
+      });
+
+      it('manageable - clean - manageable', function() {
+        expect(validateTransition({source: 'manageable',
+                                   target: 'manageable',
+                                   verb: 'clean'})).toBe(true);
+      });
+
+      it('active - deleted - available', function() {
+        expect(validateTransition({source: 'active',
+                                   target: 'available',
+                                   verb: 'deleted'})).toBe(true);
+      });
+
+      it('available - active - active', function() {
+        expect(validateTransition({source: 'available',
+                                   target: 'active',
+                                   verb: 'active'})).toBe(true);
+      });
+
+      it('available - manage - manageable', function() {
+        expect(validateTransition({source: 'available',
+                                   target: 'manageable',
+                                   verb: 'manage'})).toBe(true);
+      });
+
+      it('adopt failed - manage - manageable', function() {
+        expect(validateTransition({source: 'adopt failed',
+                                   target: 'manageable',
+                                   verb: 'manage'})).toBe(true);
+      });
+
+      it('adopt failed - adopt - active', function() {
+        expect(validateTransition({source: 'adopt failed',
+                                   target: 'active',
+                                   verb: 'adopt'})).toBe(true);
+      });
+
+      it('inspect failed - manage - manageable', function() {
+        expect(validateTransition({source: 'inspect failed',
+                                   target: 'manageable',
+                                   verb: 'manage'})).toBe(true);
+      });
+
+      it('clean wait - abort - clean failed', function() {
+        expect(validateTransition({source: 'clean wait',
+                                   target: 'clean failed',
+                                   verb: 'abort'})).toBe(true);
+      });
+
+      it('clean failed - manage - manageable', function() {
+        expect(validateTransition({source: 'clean failed',
+                                   target: 'manageable',
+                                   verb: 'manage'})).toBe(true);
+      });
+
+      it('deploy failed - active - active', function() {
+        expect(validateTransition({source: 'deploy failed',
+                                   target: 'active',
+                                   verb: 'active'})).toBe(true);
+      });
+
+      it('deploy failed - delete - manageable', function() {
+        expect(validateTransition({source: 'deploy failed',
+                                   target: 'manageable',
+                                   verb: 'deleted'})).toBe(true);
+      });
+
+      it('error - rebuild - active', function() {
+        expect(validateTransition({source: 'error',
+                                   target: 'active',
+                                   verb: 'rebuild'})).toBe(true);
+      });
+
+      it('error - deleted - manageable', function() {
+        expect(validateTransition({source: 'error',
+                                   target: 'manageable',
+                                   verb: 'deleted'})).toBe(true);
+      });
+
+      it('foo - bar - baz', function() {
+        expect(validateTransition({source: 'foo',
+                                   target: 'baz',
+                                   verb: 'bar'})).toBe(false);
+      });
+    });
+})();