1 files changed, 22 insertions, 0 deletions
diff --git a/spec/lib/gitlab/language_data_spec.rb b/spec/lib/gitlab/language_data_spec.rb
new file mode 100644
index 00000000000..b08150855fe
--- /dev/null
+++ b/spec/lib/gitlab/language_data_spec.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::LanguageData do
+  describe '#extensions' do
+    before do
+      described_class.clear_extensions!
+    end
+
+    it 'loads the extensions once' do
+      expect(YAML).to receive(:load_file).once.and_call_original
+
+      2.times do
+        expect(described_class.extensions).to be_a(Set)
+        expect(described_class.extensions.count).to be > 0
+        # Sanity check for known extensions
+        expect(described_class.extensions).to include(*%w(.rb .yml .json))
+      end
+    end
+  end
+end