1 files changed, 21 insertions, 0 deletions
diff --git a/spec/models/concerns/commit_signature_spec.rb b/spec/models/concerns/commit_signature_spec.rb
new file mode 100644
index 00000000000..4bba5a6ee41
--- /dev/null
+++ b/spec/models/concerns/commit_signature_spec.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe CommitSignature do
+  describe '#signed_by_user' do
+    context 'when class does not define the signed_by_user method' do
+      subject(:implementation) do
+        Class.new(ActiveRecord::Base) do
+          self.table_name = 'ssh_signatures'
+        end.include(described_class).new
+      end
+
+      it 'raises a NoMethodError with custom message' do
+        expect do
+          implementation.signed_by_user
+        end.to raise_error(NoMethodError, 'must implement `signed_by_user` method')
+      end
+    end
+  end
+end