Fixes some datetime dependent spec tests

spec/controllers/groups/group_links_controller_spec.rb

@@ -9,6 +9,10 @@ RSpec.describe Groups::GroupLinksController do
   let(:group_member) { create(:user) }
   let!(:project) { create(:project, group: shared_group) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   before do
     sign_in(user)
 

spec/controllers/groups/group_members_controller_spec.rb

@@ -9,6 +9,10 @@ RSpec.describe Groups::GroupMembersController do
   let(:group) { create(:group, :public) }
   let(:membership) { create(:group_member, group: group) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   describe 'GET index' do
     it 'renders index with 200 status code' do
       get :index, params: { group_id: group }

spec/controllers/projects/group_links_controller_spec.rb

@@ -8,6 +8,10 @@ RSpec.describe Projects::GroupLinksController do
   let_it_be(:project) { create(:project, :private, group: group2) }
   let_it_be(:user) { create(:user) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   before do
     project.add_maintainer(user)
     sign_in(user)

spec/controllers/projects/project_members_controller_spec.rb

@@ -7,6 +7,10 @@ RSpec.describe Projects::ProjectMembersController do
   let(:group) { create(:group, :public) }
   let(:project) { create(:project, :public) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   describe 'GET index' do
     it 'has the project_members address with a 200 status code' do
       get :index, params: { namespace_id: project.namespace, project_id: project }