feat(builder): typed engine=Literal kwarg on to_regex with EngineNotWiredError

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/builder/engine.test.py b/tests/builder/engine.test.py
new file mode 100644
index 0000000..e569c71
--- /dev/null
+++ b/tests/builder/engine.test.py
@@ -0,0 +1,19 @@
+import pytest
+
+from edify import RegexBuilder
+from edify.errors.engine import EngineNotWiredError
+
+
+def test_engine_defaults_to_re_and_compiles():
+    compiled = RegexBuilder().digit().to_regex()
+    assert compiled.source == "\\d"
+
+
+def test_engine_re_explicit_is_accepted():
+    compiled = RegexBuilder().digit().to_regex(engine="re")
+    assert compiled.source == "\\d"
+
+
+def test_engine_regex_raises_until_wired():
+    with pytest.raises(EngineNotWiredError, match="engine='regex'"):
+        RegexBuilder().digit().to_regex(engine="regex")