1 files changed, 33 insertions, 0 deletions
diff --git a/spec/models/concerns/id_in_ordered_spec.rb b/spec/models/concerns/id_in_ordered_spec.rb
new file mode 100644
index 00000000000..a3b434caac6
--- /dev/null
+++ b/spec/models/concerns/id_in_ordered_spec.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe IdInOrdered do
+  describe 'Issue' do
+    describe '.id_in_ordered' do
+      it 'returns issues matching the ids in the same order as the ids' do
+        issue1 = create(:issue)
+        issue2 = create(:issue)
+        issue3 = create(:issue)
+        issue4 = create(:issue)
+        issue5 = create(:issue)
+
+        expect(Issue.id_in_ordered([issue3.id, issue1.id, issue4.id, issue5.id, issue2.id])).to eq([
+          issue3, issue1, issue4, issue5, issue2
+        ])
+      end
+
+      context 'when the ids are not an array of integers' do
+        it 'raises ArgumentError' do
+          expect { Issue.id_in_ordered([1, 'no SQL injection']) }.to raise_error(ArgumentError, "ids must be an array of integers")
+        end
+      end
+
+      context 'when an empty array is given' do
+        it 'does not raise error' do
+          expect(Issue.id_in_ordered([]).to_a).to be_empty
+        end
+      end
+    end
+  end
+end