add tests for basic action creators

tests/actions/index.test.js

+import * as actions from '../../actions/index';
+import ActionTypes from '../../action-types';
+
+
+describe('actions', () => {
+  describe('addWindow', () => {
+    it('should create a new window with merged defaults', () => {
+      const options = {
+        id: 'helloworld',
+        canvasIndex: 1,
+      };
+
+      const expectedAction = {
+        type: ActionTypes.ADD_WINDOW,
+        payload: {
+          id: 'helloworld',
+          canvasIndex: 1,
+          collectionIndex: 0,
+          manifestIndex: 0,
+          rangeId: null,
+          xywh: null,
+          rotation: null,
+        },
+      };
+      expect(actions.addWindow(options)).toEqual(expectedAction);
+    });
+  });
+  describe('removeWindow', () => {
+    it('removes the window and returns windowId', () => {
+      const id = 'abc123';
+      const expectedAction = {
+        type: ActionTypes.REMOVE_WINDOW,
+        windowId: id,
+      };
+      expect(actions.removeWindow(id)).toEqual(expectedAction);
+    });
+  });
+  describe('nextCanvas', () => {
+    it('moves to the next canvas', () => {
+      const id = 'abc123';
+      const expectedAction = {
+        type: ActionTypes.NEXT_CANVAS,
+        windowId: id,
+      };
+      expect(actions.nextCanvas(id)).toEqual(expectedAction);
+    });
+  });
+  describe('previousCanvas', () => {
+    it('moves to the previous canvas', () => {
+      const id = 'abc123';
+      const expectedAction = {
+        type: ActionTypes.PREVIOUS_CANVAS,
+        windowId: id,
+      };
+      expect(actions.previousCanvas(id)).toEqual(expectedAction);
+    });
+  });
+});