Helpers specs coverage improvement (#23937)

spec/helpers/languages_helper_spec.rb

@@ -10,14 +10,54 @@ describe LanguagesHelper do
   end
 
   describe 'native_locale_name' do
-    it 'finds the human readable native name from a key' do
-      expect(helper.native_locale_name(:de)).to eq('Deutsch')
+    context 'with a blank locale' do
+      it 'defaults to a generic value' do
+        expect(helper.native_locale_name(nil)).to eq(I18n.t('generic.none'))
+      end
+    end
+
+    context 'with a locale of `und`' do
+      it 'defaults to a generic value' do
+        expect(helper.native_locale_name('und')).to eq(I18n.t('generic.none'))
+      end
+    end
+
+    context 'with a supported locale' do
+      it 'finds the human readable native name from a key' do
+        expect(helper.native_locale_name(:de)).to eq('Deutsch')
+      end
+    end
+
+    context 'with a regional locale' do
+      it 'finds the human readable regional name from a key' do
+        expect(helper.native_locale_name('en-GB')).to eq('English (British)')
+      end
+    end
+
+    context 'with a non-existent locale' do
+      it 'returns the supplied locale value' do
+        expect(helper.native_locale_name(:xxx)).to eq(:xxx)
+      end
     end
   end
 
   describe 'standard_locale_name' do
-    it 'finds the human readable standard name from a key' do
-      expect(helper.standard_locale_name(:de)).to eq('German')
+    context 'with a blank locale' do
+      it 'defaults to a generic value' do
+        expect(helper.standard_locale_name(nil)).to eq(I18n.t('generic.none'))
+      end
+    end
+
+    context 'with a non-existent locale' do
+      it 'returns the supplied locale value' do
+        expect(helper.standard_locale_name(:xxx)).to eq(:xxx)
+      end
+    end
+
+    context 'with a supported locale' do
+      it 'finds the human readable standard name from a key' do
+        expect(helper.standard_locale_name(:de)).to eq('German')
+      end
     end
   end
 end