diff --git a/tests/test_converters.py b/tests/test_converters.py
new file mode 100644
index 0000000..f381ce8
--- /dev/null
+++ b/tests/test_converters.py
@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+import importlib.util
+import re
+from pathlib import Path
+
+MODULE_PATH = Path(__file__).resolve().parents[1] / "code" / "robots.py"
+
+spec = importlib.util.spec_from_file_location("robots", MODULE_PATH)
+robots = importlib.util.module_from_spec(spec)
+assert spec.loader is not None
+spec.loader.exec_module(robots)
+
+
+def test_json_to_txt_preserves_order():
+    robots_txt = robots.json_to_txt({"BotA": {}, "BotB": {}})
+    assert robots_txt == "User-agent: BotA\nUser-agent: BotB\nDisallow: /\n"
+
+
+def test_list_to_pcre_escapes_special_characters():
+    items = ["Bot+One", "Bot(Two)"]
+    expected = f"({"|".join(map(re.escape, items))})"
+    assert robots.list_to_pcre(items) == expected
+
+
+def test_json_to_nginx_includes_robots_txt_exception():
+    config = robots.json_to_nginx({"BotA": {}})
+    assert "if ($request_uri = \"/robots.txt\")" in config