1 files changed, 88 insertions, 0 deletions
diff --git a/spec/services/work_items/delete_task_service_spec.rb b/spec/services/work_items/delete_task_service_spec.rb
new file mode 100644
index 00000000000..04944645c9b
--- /dev/null
+++ b/spec/services/work_items/delete_task_service_spec.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe WorkItems::DeleteTaskService do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:developer) { create(:user).tap { |u| project.add_developer(u) } }
+  let_it_be_with_refind(:task) { create(:work_item, project: project, author: developer) }
+  let_it_be_with_refind(:list_work_item) do
+    create(:work_item, project: project, description: "- [ ] #{task.to_reference}+")
+  end
+
+  let(:current_user) { developer }
+  let(:line_number_start) { 1 }
+  let(:params) do
+    {
+      line_number_start: line_number_start,
+      line_number_end: 1,
+      task: task
+    }
+  end
+
+  before_all do
+    create(:issue_link, source_id: list_work_item.id, target_id: task.id)
+  end
+
+  shared_examples 'failing WorkItems::DeleteTaskService' do |error_message|
+    it { is_expected.to be_error }
+
+    it 'does not remove work item or issue links' do
+      expect do
+        service_result
+        list_work_item.reload
+      end.to not_change(WorkItem, :count).and(
+        not_change(IssueLink, :count)
+      ).and(
+        not_change(list_work_item, :description)
+      )
+    end
+
+    it 'returns an error message' do
+      expect(service_result.errors).to contain_exactly(error_message)
+    end
+  end
+
+  describe '#execute' do
+    subject(:service_result) do
+      described_class.new(
+        work_item: list_work_item,
+        current_user: current_user,
+        lock_version: list_work_item.lock_version,
+        task_params: params
+      ).execute
+    end
+
+    context 'when work item params are valid' do
+      it { is_expected.to be_success }
+
+      it 'deletes the work item and the related issue link' do
+        expect do
+          service_result
+        end.to change(WorkItem, :count).by(-1).and(
+          change(IssueLink, :count).by(-1)
+        )
+      end
+
+      it 'removes the task list item with the work item reference' do
+        expect do
+          service_result
+        end.to change(list_work_item, :description).from(list_work_item.description).to('')
+      end
+    end
+
+    context 'when first operation fails' do
+      let(:line_number_start) { -1 }
+
+      it_behaves_like 'failing WorkItems::DeleteTaskService', 'line_number_start must be greater than 0'
+    end
+
+    context 'when last operation fails' do
+      let_it_be(:non_member_user) { create(:user) }
+
+      let(:current_user) { non_member_user }
+
+      it_behaves_like 'failing WorkItems::DeleteTaskService', 'User not authorized to delete work item'
+    end
+  end
+end