diff --git a/tests/test_base.py b/tests/test_base.py
index efa1bc81..c9abe14d 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -62,3 +62,27 @@ def test_is_title(self):
             self.base.title("one"),
             "one"
             )
+
+    def test_set_high_numwords_not_implemented(self):
+        with self.assertRaises(NotImplementedError):
+            self.base.set_high_numwords()
+
+    def test_to_ordinal_num(self):
+        from num2words.base import Num2Word_Base
+        self.base = Num2Word_Base()
+        self.assertEqual(
+            self.base.to_ordinal_num(1),
+            1
+        )
+        self.assertEqual(
+            self.base.to_ordinal_num(100),
+            100
+        )
+        self.assertEqual(
+            self.base.to_ordinal_num(1000),
+            1000
+        )
+
+    def test_pluralize_not_implemented(self):
+        with self.assertRaises(NotImplementedError):
+            self.base.pluralize(n=None, forms=None)
diff --git a/tests/test_dk.py b/tests/test_dk.py
index 889e9d8e..4c2e6ce3 100644
--- a/tests/test_dk.py
+++ b/tests/test_dk.py
@@ -20,6 +20,7 @@
 from unittest import TestCase
 
 from num2words import num2words
+from num2words.lang_DK import Num2Word_DK
 
 
 class Num2WordsDKTest(TestCase):
@@ -35,3 +36,10 @@ def test_cardinal(self):
         self.assertEqual(num2words(8, to="cardinal", lang="dk"), "otte")
         self.assertEqual(num2words(18, to="cardinal", lang="dk"), "atten")
         self.assertEqual(num2words(45, to="cardinal", lang="dk"), "femogfyrre")
+
+    def test_to_ordinal_num(self):
+        num2words_dk = Num2Word_DK()
+        self.assertEqual(num2words_dk.to_ordinal_num(1), "1te")
+        self.assertEqual(num2words_dk.to_ordinal_num(2), "2en")
+        self.assertEqual(num2words_dk.to_ordinal_num(5), "5te")
+        self.assertEqual(num2words_dk.to_ordinal_num(10), "10ende")