Add Reviewable model concern (#31152)

spec/support/examples/models/concerns/reviewable.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+shared_examples 'Reviewable' do
+  subject { described_class.new(reviewed_at: reviewed_at, requested_review_at: requested_review_at) }
+
+  let(:reviewed_at) { nil }
+  let(:requested_review_at) { nil }
+
+  describe '#requires_review?' do
+    it { is_expected.to be_requires_review }
+
+    context 'when reviewed_at is not null' do
+      let(:reviewed_at) { 5.days.ago }
+
+      it { is_expected.to_not be_requires_review }
+    end
+  end
+
+  describe '#reviewed?' do
+    it { is_expected.to_not be_reviewed }
+
+    context 'when reviewed_at is not null' do
+      let(:reviewed_at) { 5.days.ago }
+
+      it { is_expected.to be_reviewed }
+    end
+  end
+
+  describe '#requested_review?' do
+    it { is_expected.to_not be_requested_review }
+
+    context 'when requested_reviewed_at is not null' do
+      let(:requested_review_at) { 5.days.ago }
+
+      it { is_expected.to be_requested_review }
+    end
+  end
+
+  describe '#requires_review_notification?' do
+    it { is_expected.to be_requires_review_notification }
+
+    context 'when reviewed_at is not null' do
+      let(:reviewed_at) { 5.days.ago }
+
+      it { is_expected.to_not be_requires_review_notification }
+    end
+
+    context 'when requested_reviewed_at is not null' do
+      let(:requested_review_at) { 5.days.ago }
+
+      it { is_expected.to_not be_requires_review_notification }
+    end
+  end
+end