test/test_i18n.rb in review-2.1.0 vs test/test_i18n.rb in review-2.2.0

@@ -179,9 +179,26 @@
         assert_equal "３―12:", I18n.t("format_number_header", [3, 12])
       end
     end
   end
 
+  def test_format_with_mismatched_number_of_arguments
+    Dir.mktmpdir do |dir|
+      Dir.chdir(dir) do
+        file = File.join(dir, "locale.yml")
+
+        File.open(file, "w"){|f| f.write %Q|locale: ja\nformat_number_header: "%2$d"| }
+        I18n.setup("ja")
+        assert_equal "10", I18n.t("format_number_header", [1, 10])
+
+        File.open(file, "w"){|f| f.write %Q|locale: ja\nformat_number_header: "%2$d-%1$d"| }
+        I18n.setup("ja")
+        # ERROR: returns raw format
+        assert_equal "%2$d-%1$d", I18n.t("format_number_header", [1])
+      end
+    end
+  end
+
   def test_ja
     I18n.setup("ja")
     assert_equal "図", I18n.t("image")
     assert_equal "表", I18n.t("table")
     assert_equal "第1章", I18n.t("chapter", 1)