diff --git a/tests/core/test_morpheme.py b/tests/core/test_morpheme.py
index c3c5449c8..9e81b2b28 100644
--- a/tests/core/test_morpheme.py
+++ b/tests/core/test_morpheme.py
@@ -21,21 +21,21 @@ def test_nighit(self):
             nighit("สํ", "มาร")  # consonant ม is not in any supported group
 
     def test_is_native_thai(self):
-        self.assertFalse(is_native_thai(None), False)  # type: ignore[arg-type]
-        self.assertFalse(is_native_thai(""), False)
-        self.assertFalse(is_native_thai("116"), False)
-        self.assertFalse(is_native_thai("abc"), False)
-        self.assertFalse(is_native_thai("ศา"), False)
-        self.assertFalse(is_native_thai("ลักษ์"), False)
-        self.assertFalse(is_native_thai("มาร์ค"), False)
-        self.assertFalse(is_native_thai("เลข"), False)
-        self.assertFalse(is_native_thai("เทเวศน์"), False)
-        self.assertFalse(is_native_thai("เทเวศร์"), False)
-        self.assertTrue(is_native_thai("ตา"), True)
-        self.assertTrue(is_native_thai("ยา"), True)
-        self.assertTrue(is_native_thai("ฆ่า"), True)
-        self.assertTrue(is_native_thai("คน"), True)
-        self.assertTrue(is_native_thai("มอ"), True)
-        self.assertTrue(is_native_thai("กะ"), True)
-        self.assertTrue(is_native_thai("กระ"), True)
-        self.assertTrue(is_native_thai("ประท้วง"), True)
+        self.assertFalse(is_native_thai(None))  # type: ignore[arg-type]
+        self.assertFalse(is_native_thai(""))
+        self.assertFalse(is_native_thai("116"))
+        self.assertFalse(is_native_thai("abc"))
+        self.assertFalse(is_native_thai("ศา"))
+        self.assertFalse(is_native_thai("ลักษ์"))
+        self.assertFalse(is_native_thai("มาร์ค"))
+        self.assertFalse(is_native_thai("เลข"))
+        self.assertFalse(is_native_thai("เทเวศน์"))
+        self.assertFalse(is_native_thai("เทเวศร์"))
+        self.assertTrue(is_native_thai("ตา"))
+        self.assertTrue(is_native_thai("ยา"))
+        self.assertTrue(is_native_thai("ฆ่า"))
+        self.assertTrue(is_native_thai("คน"))
+        self.assertTrue(is_native_thai("มอ"))
+        self.assertTrue(is_native_thai("กะ"))
+        self.assertTrue(is_native_thai("กระ"))
+        self.assertTrue(is_native_thai("ประท้วง"))