1 files changed, 97 insertions, 0 deletions
diff --git a/spec/models/users/merge_request_interaction_spec.rb b/spec/models/users/merge_request_interaction_spec.rb
new file mode 100644
index 00000000000..d333577fa1a
--- /dev/null
+++ b/spec/models/users/merge_request_interaction_spec.rb
@@ -0,0 +1,97 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ::Users::MergeRequestInteraction do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project, :public, :repository) }
+  let_it_be(:merge_request) { create(:merge_request, source_project: project) }
+
+  subject(:interaction) do
+    ::Users::MergeRequestInteraction.new(user: user, merge_request: merge_request.reset)
+  end
+
+  describe 'declarative policy delegation' do
+    it 'delegates to the merge request' do
+      expect(subject.declarative_policy_subject).to eq(merge_request)
+    end
+  end
+
+  describe '#can_merge?' do
+    context 'when the user cannot merge' do
+      it { is_expected.not_to be_can_merge }
+    end
+
+    context 'when the user can merge' do
+      before do
+        project.add_maintainer(user)
+      end
+
+      it { is_expected.to be_can_merge }
+    end
+  end
+
+  describe '#can_update?' do
+    context 'when the user cannot update the MR' do
+      it { is_expected.not_to be_can_update }
+    end
+
+    context 'when the user can update the MR' do
+      before do
+        project.add_developer(user)
+      end
+
+      it { is_expected.to be_can_update }
+    end
+  end
+
+  describe '#review_state' do
+    subject { interaction.review_state }
+
+    context 'when the user has not been asked to review the MR' do
+      it { is_expected.to be_nil }
+
+      it 'implies not reviewed' do
+        expect(interaction).not_to be_reviewed
+      end
+    end
+
+    context 'when the user has been asked to review the MR' do
+      before do
+        merge_request.reviewers << user
+      end
+
+      it { is_expected.to eq(Types::MergeRequestReviewStateEnum.values['UNREVIEWED'].value) }
+
+      it 'implies not reviewed' do
+        expect(interaction).not_to be_reviewed
+      end
+    end
+
+    context 'when the user has provided a review' do
+      before do
+        merge_request.merge_request_reviewers.create!(reviewer: user, state: MergeRequestReviewer.states['reviewed'])
+      end
+
+      it { is_expected.to eq(Types::MergeRequestReviewStateEnum.values['REVIEWED'].value) }
+
+      it 'implies reviewed' do
+        expect(interaction).to be_reviewed
+      end
+    end
+  end
+
+  describe '#approved?' do
+    context 'when the user has not approved the MR' do
+      it { is_expected.not_to be_approved }
+    end
+
+    context 'when the user has approved the MR' do
+      before do
+        merge_request.approved_by_users << user
+      end
+
+      it { is_expected.to be_approved }
+    end
+  end
+end