From fb2dff51dfdd8a1cb8c4353cae72dd21435b313f Mon Sep 17 00:00:00 2001
From: John Doty <john@d0ty.me>
Date: Sat, 15 Jun 2024 06:14:37 -0700
Subject: [PATCH] Tests. Well, test.

---
 tests/__init__.py     |  0
 tests/test_grammar.py | 18 ++++++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 tests/__init__.py
 create mode 100644 tests/test_grammar.py

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()