Fix some of tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/models/project_services/slack_service_spec.rb

@@ -67,7 +67,7 @@ describe SlackService do
       opts = {
         title: 'Awesome merge_request',
         description: 'please fix',
-        source_branch: 'stable',
+        source_branch: 'feature',
         target_branch: 'master'
       }
       merge_service = MergeRequests::CreateService.new(project,

spec/models/repository_spec.rb

@@ -36,13 +36,13 @@ describe Repository do
 
   describe :can_be_merged? do
     context 'mergeable branches' do
-      subject { repository.can_be_merged?('feature', 'master') }
+      subject { repository.can_be_merged?('0b4bc9a49b562e85de7cc9e834518ea6828729b9', 'master') }
 
       it { is_expected.to be_truthy }
     end
 
     context 'non-mergeable branches' do
-      subject { repository.can_be_merged?('feature_conflict', 'feature') }
+      subject { repository.can_be_merged?('bb5206fee213d983da88c47f9cf4cc6caf9c66dc', 'feature') }
 
       it { is_expected.to be_falsey }
     end

spec/support/mentionable_shared_examples.rb

@@ -9,7 +9,7 @@ def common_mentionable_setup
   let(:author)  { subject.author }
 
   let(:mentioned_issue)  { create(:issue, project: project) }
-  let(:mentioned_mr)     { create(:merge_request, :simple, source_project: project) }
+  let!(:mentioned_mr)     { create(:merge_request, :simple, source_project: project) }
   let(:mentioned_commit) { project.commit }
 
   let(:ext_proj)   { create(:project, :public) }