[Test] Add tests for root registration

Add unit tests for RootRegistry and RootObjectProvider.

https://github.com/nasa/openmct/issues/1251

src/api/objects/RootObjectProvider.js

@@ -37,7 +37,7 @@ define([
                     composition: roots
                 };
             });
-    }
+    };
 
     return RootObjectProvider;
 });

src/api/objects/RootRegistry.js

@@ -38,11 +38,14 @@ define([
             .then(_.flatten);
     };
 
+    function isKey(key) {
+        return _.isObject(key) && _.has(key, 'key') && _.has(key, 'namespace');
+    }
 
     RootRegistry.prototype.addRoot = function (key) {
-        if (_.isObject(key) && _.has(key, 'identifier') && _.has(key, 'namespace')) {
+        if (isKey(key) || (_.isArray(key) && _.every(key, isKey))) {
             this.providers.push(function () {
-                return Promise.resolve(key);
+                return key;
             });
         } else if (_.isFunction(key)) {
             this.providers.push(key);

src/api/objects/test/RootObjectProviderSpec.js

@@ -0,0 +1,59 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2016, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is 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.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+define([
+    '../RootObjectProvider'
+], function (
+    RootObjectProvider
+) {
+    describe('RootObjectProvider', function () {
+        var rootRegistry,
+            rootObjectProvider;
+
+        function done() {
+            var isDone = false;
+            waitsFor(function () {
+                return isDone;
+            });
+            return function () {
+                isDone = true;
+            };
+        }
+
+        beforeEach(function () {
+            rootRegistry = jasmine.createSpyObj('rootRegistry', ['getRoots']);
+            rootRegistry.getRoots.andReturn(Promise.resolve(['some root']));
+            rootObjectProvider = new RootObjectProvider(rootRegistry);
+        });
+
+        it('supports fetching root', function () {
+            rootObjectProvider.get()
+                .then(function (root) {
+                    expect(root).toEqual({
+                        name: 'The root object',
+                        type: 'root',
+                        composition: ['some root']
+                    });
+                })
+                .then(done());
+        });
+    });
+});

src/api/objects/test/RootRegistrySpec.js

@@ -0,0 +1,102 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2016, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is 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.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+define([
+    '../RootRegistry'
+], function (
+    RootRegistry
+) {
+    describe('RootRegistry', function () {
+        var idA,
+            idB,
+            idC,
+            registry;
+
+        function done() {
+            var isDone = false;
+            waitsFor(function () {
+                return isDone;
+            });
+            return function () {
+                isDone = true;
+            };
+        }
+
+        beforeEach(function () {
+            idA = {key: 'keyA', namespace: 'something'};
+            idB = {key: 'keyB', namespace: 'something'};
+            idC = {key: 'keyC', namespace: 'something'};
+            registry = new RootRegistry();
+        });
+
+        it('can register a root by key', function () {
+            registry.addRoot(idA);
+            registry.getRoots()
+                .then(function (roots) {
+                    expect(roots).toEqual([idA]);
+                })
+                .then(done());
+        });
+
+        it('can register multiple roots by key', function () {
+            registry.addRoot([idA, idB]);
+            registry.getRoots()
+                .then(function (roots) {
+                    expect(roots).toEqual([idA, idB]);
+                })
+                .then(done());
+        });
+
+        it('can register an asynchronous root ', function () {
+            registry.addRoot(function () {
+                return Promise.resolve(idA);
+            });
+            registry.getRoots()
+                .then(function (roots) {
+                    expect(roots).toEqual([idA]);
+                })
+                .then(done());
+        });
+
+        it('can register multiple asynchronous roots', function () {
+            registry.addRoot(function () {
+                return Promise.resolve([idA, idB]);
+            });
+            registry.getRoots()
+                .then(function (roots) {
+                    expect(roots).toEqual([idA, idB]);
+                })
+                .then(done());
+        });
+
+        it('can combine different types of registration', function () {
+            registry.addRoot([idA, idB]);
+            registry.addRoot(function () {
+                return Promise.resolve([idC]);
+            });
+            registry.getRoots()
+                .then(function (roots) {
+                    expect(roots).toEqual([idA, idB, idC]);
+                })
+                .then(done());
+        });
+    });
+});