Adapt frontend-specs to new embedding

just realized that those are 12k lines of C&P activities.
I reduced the amount to a less insane (but still not quite sane) ~1k lines...

It might be a better idea to automatically generate those mocks.
This would be:
- more consistent
- more up-to-date with real data
- less error-prone (b.c. less copypasta)

frontend/tests/integration/mocks/work-packages/819.json

@@ -140,6 +140,9 @@
     },
     "attachments": {
       "href": "/api/v3/work_packages/819/attachments"
+    },
+    "activities": {
+      "href": "/api/v3/work_packages/819/activities"
     }
   },
   "_embedded": {
@@ -279,7 +282,15 @@
       "updatedAt": "2015-02-13T10:08:53+00:00",
       "type": null
     },
-    "activities": [
+    "activities": {
+      "_type": "Collection",
+      "_links": {
+        "self": { "href": "/api/v3/work_packages/819/activities" }
+      },
+      "total": 4,
+      "count": 4,
+      "_embedded": {
+        "elements": [
           {
             "_type": "Activity",
             "_links": {
@@ -461,7 +472,9 @@
             "version": 4,
             "createdAt": "2015-04-07T13:37:33+00:00"
           }
-    ],
+        ]
+      }
+    },
     "watchers": [],
     "attachments" : {
       "_links" : {

frontend/tests/integration/specs/work-packages/details-pane/activity-with-revisions-spec.js

@@ -37,15 +37,14 @@ describe('OpenProject', function() {
     beforeEach(function() {
       detailsPaneHelper.loadPane(820, 'activity');
     });
-
     it('should render all activities and one revision', function() {
       var locator = by.css('.work-package-details-activities-activity');
-      elements.count(locator, 61);
+      elements.count(locator, 5);
     });
 
     it('should render one revision at the correct position', function() {
       expect(
-        $('.work-package-details-activities-activity:nth-of-type(61) .date').getText()
+        $('.work-package-details-activities-activity:nth-of-type(5) .date').getText()
       ).to.eventually.contain('committed revision 1cb82424');
     });
   });

frontend/tests/unit/tests/work_packages/controllers/work-package-details-controller-test.js

@@ -57,7 +57,17 @@ describe('WorkPackageDetailsController', function() {
               id: 1
             }
           },
-          activities: [],
+          activities: {
+            links: {
+              self: { href: "/api/v3/work_packages/820/activities" }
+            },
+            _type: "Collection",
+            total: 0,
+            count: 0,
+            embedded: {
+              elements: []
+            }
+          },
           watchers: [],
           attachments: {
             links: {
@@ -125,7 +135,7 @@ describe('WorkPackageDetailsController', function() {
 
     buildController = function() {
       var testState = {
-        current: { url: '/overview', },
+        current: { url: '/overview' }
       };
       scope = $rootScope.$new();