1 files changed, 43 insertions, 0 deletions
diff --git a/spec/models/concerns/issuable_link_spec.rb b/spec/models/concerns/issuable_link_spec.rb
new file mode 100644
index 00000000000..7be6d8a074d
--- /dev/null
+++ b/spec/models/concerns/issuable_link_spec.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe IssuableLink do
+  let(:test_class) do
+    Class.new(ApplicationRecord) do
+      include IssuableLink
+
+      self.table_name = 'issue_links'
+
+      belongs_to :source, class_name: 'Issue'
+      belongs_to :target, class_name: 'Issue'
+
+      def self.name
+        'TestClass'
+      end
+    end
+  end
+
+  describe '.inverse_link_type' do
+    it 'returns the inverse type of link' do
+      expect(test_class.inverse_link_type('relates_to')).to eq('relates_to')
+    end
+  end
+
+  describe '.issuable_type' do
+    let_it_be(:source_issue) { create(:issue) }
+    let_it_be(:target_issue) { create(:issue) }
+
+    before do
+      test_class.create!(source: source_issue, target: target_issue)
+    end
+
+    context 'when opposite relation already exists' do
+      it 'raises NotImplementedError when performing validations' do
+        instance = test_class.new(source: target_issue, target: source_issue)
+
+        expect { instance.save! }.to raise_error(NotImplementedError)
+      end
+    end
+  end
+end