diff --git a/test/test_src.lua b/test/test_src.lua
index a4ff50f10..2ae45d0ac 100644
--- a/test/test_src.lua
+++ b/test/test_src.lua
@@ -71,6 +71,30 @@ local tests = {
       loch = "lochs",
       tech = "techs",
    },
+   makesingular = {
+      algae = "alga",
+      amoebae = "amoeba",
+      baluchitheria = "baluchitherium",
+      Bordeaux = "Bordeaux",
+      buses = "bus",
+      dingoes = "dingo",
+      ["gateaux au chocolat"] = "gateau au chocolat",
+      larvae = "larva",
+      lice = "louse",
+      matzot = "matzo",
+      mycelia = "mycelium",
+      nemeses = "nemesis",
+      oxen = "ox",
+      potatoes = "potato",
+      ["pots of tulips"] = "pot of tulips",
+      priestesses = "priestess",
+      ronin = "ronin",
+      ["set of dragon scales"] = "set of dragon scales",
+      techs = "tech",
+      tuna = "tuna",
+      vertebrae = "vertebra",
+      vortices = "vortex",
+   },
    an = {
       a = "an a",
       b = "a b",