1 files changed, 25 insertions, 0 deletions
diff --git a/spec/helpers/ssh_keys_helper_spec.rb b/spec/helpers/ssh_keys_helper_spec.rb
new file mode 100644
index 00000000000..1aa604f19be
--- /dev/null
+++ b/spec/helpers/ssh_keys_helper_spec.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe SshKeysHelper do
+  describe '#ssh_key_allowed_algorithms' do
+    it 'returns string with the names of allowed algorithms that are quoted and joined by commas' do
+      allowed_algorithms = Gitlab::CurrentSettings.allowed_key_types.flat_map do |ssh_key_type_name|
+        Gitlab::SSHPublicKey.supported_algorithms_for_name(ssh_key_type_name)
+      end
+
+      quoted_allowed_algorithms = allowed_algorithms.map { |name| "'#{name}'" }
+
+      expected_string = Gitlab::Utils.to_exclusive_sentence(quoted_allowed_algorithms)
+
+      expect(ssh_key_allowed_algorithms).to eq(expected_string)
+    end
+
+    it 'returns only allowed algorithms' do
+      expect(ssh_key_allowed_algorithms).to match('ed25519')
+      stub_application_setting(ed25519_key_restriction: ApplicationSetting::FORBIDDEN_KEY_VALUE)
+      expect(ssh_key_allowed_algorithms).not_to match('ed25519')
+    end
+  end
+end