fix!: stacked quantifiers raise StackedQuantifierError at chain time

1 files changed, 42 insertions, 0 deletions

diff --git a/tests/errors/stacked_quantifier.test.py b/tests/errors/stacked_quantifier.test.py
new file mode 100644
index 0000000..4e512dd
--- /dev/null
+++ b/tests/errors/stacked_quantifier.test.py
@@ -0,0 +1,42 @@
+"""Tests for :class:`StackedQuantifierError` raised on stacked quantifier chain calls."""
+
+import pytest
+
+from edify import Pattern, RegexBuilder
+from edify.errors.quantifier import StackedQuantifierError
+
+
+def test_stacking_one_or_more_over_exactly_raises():
+    with pytest.raises(StackedQuantifierError):
+        RegexBuilder().one_or_more().exactly(3).digit()
+
+
+def test_stacking_optional_over_at_least_raises():
+    with pytest.raises(StackedQuantifierError):
+        RegexBuilder().optional().at_least(2).digit()
+
+
+def test_stacking_between_over_zero_or_more_raises():
+    with pytest.raises(StackedQuantifierError):
+        RegexBuilder().zero_or_more().between(1, 3).digit()
+
+
+def test_stacking_lazy_variants_also_raises():
+    with pytest.raises(StackedQuantifierError):
+        RegexBuilder().one_or_more_lazy().exactly(2).digit()
+
+
+def test_stacking_on_pattern_raises():
+    with pytest.raises(StackedQuantifierError):
+        Pattern().one_or_more().exactly(3).digit()
+
+
+def test_a_valid_quantifier_element_quantifier_element_chain_works():
+    expr = RegexBuilder().one_or_more().digit().exactly(3).word()
+    assert expr.to_regex_string() == "\\d+\\w{3}"
+
+
+def test_stacked_quantifier_error_message_contains_expected_text():
+    error = StackedQuantifierError()
+    assert "stack" in str(error)
+    assert "pending" in str(error)
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