1 files changed, 59 insertions, 0 deletions
diff --git a/spec/models/concerns/sidebars/positionable_list_spec.rb b/spec/models/concerns/sidebars/positionable_list_spec.rb
new file mode 100644
index 00000000000..231aa5295dd
--- /dev/null
+++ b/spec/models/concerns/sidebars/positionable_list_spec.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Sidebars::PositionableList do
+  subject do
+    Class.new do
+      include Sidebars::PositionableList
+    end.new
+  end
+
+  describe '#add_element' do
+    it 'adds the element to the last position of the list' do
+      list = [1, 2]
+
+      subject.add_element(list, 3)
+
+      expect(list).to eq([1, 2, 3])
+    end
+  end
+
+  describe '#insert_element_before' do
+    let(:user) { build(:user) }
+    let(:list) { [1, user] }
+
+    it 'adds element before the specific element class' do
+      subject.insert_element_before(list, User, 2)
+
+      expect(list).to eq [1, 2, user]
+    end
+
+    context 'when reference element does not exist' do
+      it 'adds the element to the top of the list' do
+        subject.insert_element_before(list, Project, 2)
+
+        expect(list).to eq [2, 1, user]
+      end
+    end
+  end
+
+  describe '#insert_element_after' do
+    let(:user) { build(:user) }
+    let(:list) { [1, user] }
+
+    it 'adds element after the specific element class' do
+      subject.insert_element_after(list, Integer, 2)
+
+      expect(list).to eq [1, 2, user]
+    end
+
+    context 'when reference element does not exist' do
+      it 'adds the element to the end of the list' do
+        subject.insert_element_after(list, Project, 2)
+
+        expect(list).to eq [1, user, 2]
+      end
+    end
+  end
+end