1 files changed, 113 insertions, 0 deletions
diff --git a/spec/services/milestones/promote_service_spec.rb b/spec/services/milestones/promote_service_spec.rb
new file mode 100644
index 00000000000..a0a2843b676
--- /dev/null
+++ b/spec/services/milestones/promote_service_spec.rb
@@ -0,0 +1,113 @@
+require 'spec_helper'
+
+describe Milestones::PromoteService do
+  let(:group) { create(:group) }
+  let(:project) { create(:project, namespace: group) }
+  let(:user) { create(:user) }
+  let(:milestone_title) { 'project milestone' }
+  let(:milestone) { create(:milestone, project: project, title: milestone_title) }
+  let(:service) { described_class.new(project, user) }
+
+  describe '#execute' do
+    before do
+      group.add_master(user)
+    end
+
+    context 'validations' do
+      it 'raises error if milestone does not belong to a project' do
+        allow(milestone).to receive(:project_milestone?).and_return(false)
+
+        expect { service.execute(milestone) }.to raise_error(described_class::PromoteMilestoneError)
+      end
+
+      it 'raises error if project does not belong to a group' do
+        project.update(namespace: user.namespace)
+
+        expect { service.execute(milestone) }.to raise_error(described_class::PromoteMilestoneError)
+      end
+
+      it 'does not promote milestone and update issuables if promoted milestone is not valid' do
+        issue = create(:issue, milestone: milestone, project: project)
+        merge_request = create(:merge_request, milestone: milestone, source_project: project)
+        allow_any_instance_of(Milestone).to receive(:valid?).and_return(false)
+
+        expect { service.execute(milestone) }.to raise_error(described_class::PromoteMilestoneError)
+
+        expect(milestone.reload).to be_persisted
+        expect(issue.reload.milestone).to eq(milestone)
+        expect(merge_request.reload.milestone).to eq(milestone)
+      end
+    end
+
+    context 'without duplicated milestone titles across projects' do
+      it 'promotes project milestone to group milestone' do
+        promoted_milestone = service.execute(milestone)
+
+        expect(promoted_milestone).to be_group_milestone
+      end
+
+      it 'does not update issuables without milestone with the new promoted milestone' do
+        issue_without_milestone = create(:issue, project: project, milestone: nil)
+        merge_request_without_milestone = create(:merge_request, milestone: nil, source_project: project)
+
+        service.execute(milestone)
+
+        expect(issue_without_milestone.reload.milestone).to be_nil
+        expect(merge_request_without_milestone.reload.milestone).to be_nil
+      end
+
+      it 'sets issuables with new promoted milestone' do
+        issue = create(:issue, milestone: milestone, project: project)
+        merge_request = create(:merge_request, milestone: milestone, source_project: project)
+
+        promoted_milestone = service.execute(milestone)
+
+        expect(promoted_milestone).to be_group_milestone
+        expect(issue.reload.milestone).to eq(promoted_milestone)
+        expect(merge_request.reload.milestone).to eq(promoted_milestone)
+      end
+    end
+
+    context 'with duplicated milestone titles across projects' do
+      let(:project_2) { create(:project, namespace: group) }
+      let!(:milestone_2) { create(:milestone, project: project_2, title: milestone_title) }
+
+      it 'deletes project milestones with the same title' do
+        promoted_milestone = service.execute(milestone)
+
+        expect(promoted_milestone).to be_group_milestone
+        expect(promoted_milestone).to be_valid
+        expect(Milestone.exists?(milestone.id)).to be_falsy
+        expect(Milestone.exists?(milestone_2.id)).to be_falsy
+      end
+
+      it 'does not update issuables without milestone with the new promoted milestone' do
+        issue_without_milestone_1 = create(:issue, project: project, milestone: nil)
+        issue_without_milestone_2 = create(:issue, project: project_2, milestone: nil)
+        merge_request_without_milestone_1 = create(:merge_request, milestone: nil, source_project: project)
+        merge_request_without_milestone_2 = create(:merge_request, milestone: nil, source_project: project_2)
+
+        service.execute(milestone)
+
+        expect(issue_without_milestone_1.reload.milestone).to be_nil
+        expect(issue_without_milestone_2.reload.milestone).to be_nil
+        expect(merge_request_without_milestone_1.reload.milestone).to be_nil
+        expect(merge_request_without_milestone_2.reload.milestone).to be_nil
+      end
+
+      it 'sets all issuables with new promoted milestone' do
+        issue = create(:issue, milestone: milestone, project: project)
+        issue_2 = create(:issue, milestone: milestone_2, project: project_2)
+        merge_request = create(:merge_request, milestone: milestone, source_project: project)
+        merge_request_2 = create(:merge_request, milestone: milestone_2, source_project: project_2)
+
+        promoted_milestone = service.execute(milestone)
+
+        expect(issue.reload.milestone).to eq(promoted_milestone)
+        expect(issue_2.reload.milestone).to eq(promoted_milestone)
+        expect(merge_request.reload.milestone).to eq(promoted_milestone)
+        expect(merge_request_2.reload.milestone).to eq(promoted_milestone)
+      end
+    end
+  end
+end