added relevant specs

spec/lib/gitlab/user_activities_spec.rb

+require 'spec_helper'
+
+describe Gitlab::UserActivities, :redis, lib: true do
+  let(:user) { create(:user) }
+
+  it 'shows the last user activities' do
+    Timecop.freeze do
+      Users::ActivityService.new(user, 'type').execute
+
+      expect(described_class.query).to eq({ username: user.username,
+                                            last_activity: DateTime.now })
+    end
+  end
+
+  context 'paginated activities' do
+    before do
+      Timecop.scale(3600)
+
+      7.times do
+        Users::ActivityService.new(create(:user), 'type').execute
+      end
+    end
+
+    after do
+      Timecop.return
+    end
+
+    it 'shows the 5 oldest user activities paginated' do
+      expect(described_class.query(per_page: 5).count).to eq(5)
+    end
+
+    it 'shows the 2 reamining user activities paginated' do
+      expect(described_class.query(per_page: 5, page: 1).count).to eq(2)
+    end
+
+    it 'shows the oldest first' do
+      # FIXME
+      expect(described_class.query.first.second).to be < described_class.query.last.second
+    end
+  end
+
+  context 'filter by date'do
+    before do
+      Timecop.freeze(Date.yesterday)
+    end
+
+    after do
+      Timecop.return
+    end
+
+    it 'shows activities from yesterday' do
+      expect(described_class.query(from: Date.yesterday).count).to eq(1)
+    end
+
+    it 'filter activities from today' do
+      expect(described_class.query(from: Date.today).count).to eq(0)
+    end
+  end
+end

spec/requests/api/users_spec.rb

@@ -1100,4 +1100,22 @@ describe API::Users, api: true  do
       expect(json_response['message']).to eq('404 User Not Found')
     end
   end
+
+  context "user activities" do
+    it_behaves_like 'a paginated resources' do
+      let(:request) { get api("/users/activities", user) }
+    end
+
+    context 'last activities' do
+      it 'returns the last activities' do
+        Users::ActivityService.new(user, 'type').execute
+
+        get api("/users/activities", user)
+
+        activity = json_response.first
+
+        expect(activity['project_id'].to_i).to eq(project.id)
+      end
+    end
+  end
 end