feat(ActivitiesAdapter): implement adapter

src/ActivitiesAdapter.js

@@ -0,0 +1,33 @@
+import {throwError} from 'rxjs';
+
+import WebexAdapter from './WebexAdapter';
+
+/**
+ * An activity a person performs in Webex.
+ *
+ * @typedef  {Object} Activity
+ * @property {string}  ID             The activity identifier.
+ * @property {string}  roomID         ID of the room where the activity happens.
+ * @property {string}  text           Any text the activity may contain.
+ * @property {string}  personID       ID of the person performing the activity.
+ * @property {Date}    created        Timestamp of the time when the activity happened.
+ * @property {Boolean} displayAuthor  Whether to display author information or not.
+ */
+
+/**
+ * This is a base class that defines the interface that maps activity data.
+ * Developers that want to extend `ActivitiesAdapter` must implement all of its methods,
+ * adhering to the exact parameters and structure of the returned objects.
+ */
+export default class ActivitiesAdapter extends WebexAdapter {
+  /**
+   * Returns an observable that emits activity data of the given ID.
+   *
+   * @param {string} ID  ID of the activity to get.
+   * @returns {Observable.<Activity>}
+   * @memberof ActivityAdapter
+   */
+  getActivity(ID) {
+    return throwError(new Error('getActivity(ID) must be defined in ActivitiesAdapter'));
+  }
+}

src/ActivitiesAdapter.test.js

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+import {isObservable} from 'rxjs';
+
+import ActivitiesAdapter from './ActivitiesAdapter';
+
+describe('Activities Adapter Interface', () => {
+  let activitiesAdapter;
+
+  beforeEach(() => {
+    activitiesAdapter = new ActivitiesAdapter();
+  });
+
+  test('getActivity() returns an observable', () => {
+    expect(isObservable(activitiesAdapter.getActivity())).toBeTruthy();
+  });
+
+  test('getActivity() errors because it needs to be defined', (done) => {
+    activitiesAdapter.getActivity('msgID').subscribe(
+      () => {},
+      (error) => {
+        expect(error.message).toBe('getActivity(ID) must be defined in ActivitiesAdapter');
+        done();
+      }
+    );
+  });
+
+  afterEach(() => {
+    activitiesAdapter = null;
+  });
+});