3 files changed, 36 insertions, 7 deletions
diff --git a/spec/services/milestones/destroy_service_spec.rb b/spec/services/milestones/destroy_service_spec.rb
index dd68471d927..6c08b7db43a 100644
--- a/spec/services/milestones/destroy_service_spec.rb
+++ b/spec/services/milestones/destroy_service_spec.rb
@@ -22,14 +22,16 @@ RSpec.describe Milestones::DestroyService do
       expect { milestone.reload }.to raise_error ActiveRecord::RecordNotFound
     end
 
-    it 'deletes milestone id from issuables' do
-      issue = create(:issue, project: project, milestone: milestone)
-      merge_request = create(:merge_request, source_project: project, milestone: milestone)
+    context 'with an existing merge request' do
+      let!(:issue) { create(:issue, project: project, milestone: milestone) }
+      let!(:merge_request) { create(:merge_request, source_project: project, milestone: milestone) }
 
-      service.execute(milestone)
+      it 'deletes milestone id from issuables' do
+        service.execute(milestone)
 
-      expect(issue.reload.milestone).to be_nil
-      expect(merge_request.reload.milestone).to be_nil
+        expect(issue.reload.milestone).to be_nil
+        expect(merge_request.reload.milestone).to be_nil
+      end
     end
 
     it 'logs destroy event' do
diff --git a/spec/services/milestones/merge_requests_count_service_spec.rb b/spec/services/milestones/merge_requests_count_service_spec.rb
new file mode 100644
index 00000000000..aecc7d5ef52
--- /dev/null
+++ b/spec/services/milestones/merge_requests_count_service_spec.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Milestones::MergeRequestsCountService, :use_clean_rails_memory_store_caching do
+  let_it_be(:project) { create(:project, :empty_repo) }
+  let_it_be(:milestone) { create(:milestone, project: project) }
+
+  before_all do
+    create(:merge_request, milestone: milestone, source_project: project)
+    create(:merge_request, :closed, milestone: milestone, source_project: project)
+  end
+
+  subject { described_class.new(milestone) }
+
+  it_behaves_like 'a counter caching service'
+
+  it 'counts all merge requests' do
+    expect(subject.count).to eq(2)
+  end
+end
diff --git a/spec/services/milestones/transfer_service_spec.rb b/spec/services/milestones/transfer_service_spec.rb
index 6f4f55b2bd0..afbc9c7dca2 100644
--- a/spec/services/milestones/transfer_service_spec.rb
+++ b/spec/services/milestones/transfer_service_spec.rb
@@ -50,7 +50,7 @@ RSpec.describe Milestones::TransferService do
           end
         end
 
-        it 'deletes milestone issue counters cache for both milestones' do
+        it 'deletes milestone counters cache for both milestones' do
           new_milestone = create(:milestone, project: project, title: group_milestone.title)
 
           expect_next_instance_of(Milestones::IssuesCountService, group_milestone) do |service|
@@ -59,12 +59,18 @@ RSpec.describe Milestones::TransferService do
           expect_next_instance_of(Milestones::ClosedIssuesCountService, group_milestone) do |service|
             expect(service).to receive(:delete_cache).and_call_original
           end
+          expect_next_instance_of(Milestones::MergeRequestsCountService, group_milestone) do |service|
+            expect(service).to receive(:delete_cache).and_call_original
+          end
           expect_next_instance_of(Milestones::IssuesCountService, new_milestone) do |service|
             expect(service).to receive(:delete_cache).and_call_original
           end
           expect_next_instance_of(Milestones::ClosedIssuesCountService, new_milestone) do |service|
             expect(service).to receive(:delete_cache).and_call_original
           end
+          expect_next_instance_of(Milestones::MergeRequestsCountService, new_milestone) do |service|
+            expect(service).to receive(:delete_cache).and_call_original
+          end
 
           service.execute
         end