diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_grammar.py b/tests/test_grammar.py
new file mode 100644
index 0000000..3845990
--- /dev/null
+++ b/tests/test_grammar.py
@@ -0,0 +1,18 @@
+import parser
+import pytest
+
+
+def test_conflicting_names():
+    """Terminals and nonterminals can have the same name."""
+
+    IDENTIFIER = parser.Terminal("Identifier")
+
+    class TestGrammar(parser.Grammar):
+        start = "Identifier"
+
+        @parser.rule("Identifier")
+        def identifier(self):
+            return IDENTIFIER
+
+    with pytest.raises(ValueError):
+        TestGrammar().build_table()