fix!: dangling quantifier raises DanglingQuantifierError at emit

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/errors/dangling_quantifier.test.py b/tests/errors/dangling_quantifier.test.py
new file mode 100644
index 0000000..7823996
--- /dev/null
+++ b/tests/errors/dangling_quantifier.test.py
@@ -0,0 +1,52 @@
+"""Tests for :class:`DanglingQuantifierError` raised at emit time."""
+
+import pytest
+
+from edify import Pattern, RegexBuilder
+from edify.errors.quantifier import DanglingQuantifierError
+
+
+def test_to_regex_string_raises_when_a_bare_quantifier_has_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        RegexBuilder().exactly(3).to_regex_string()
+
+
+def test_to_regex_string_raises_for_optional_with_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        RegexBuilder().optional().to_regex_string()
+
+
+def test_to_regex_string_raises_for_zero_or_more_with_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        RegexBuilder().zero_or_more().to_regex_string()
+
+
+def test_to_regex_string_raises_for_one_or_more_with_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        RegexBuilder().one_or_more().to_regex_string()
+
+
+def test_to_regex_string_raises_for_between_with_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        RegexBuilder().between(2, 5).to_regex_string()
+
+
+def test_pattern_to_regex_string_raises_when_a_bare_quantifier_has_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        Pattern().exactly(3).to_regex_string()
+
+
+def test_to_regex_raises_when_a_bare_quantifier_has_no_operand():
+    with pytest.raises(DanglingQuantifierError):
+        RegexBuilder().at_least(2).to_regex()
+
+
+def test_message_hints_at_appending_an_operand():
+    with pytest.raises(DanglingQuantifierError, match="Append an element"):
+        RegexBuilder().exactly(3).to_regex_string()
+
+
+def test_dangling_quantifier_error_message_contains_expected_text():
+    error = DanglingQuantifierError()
+    assert "Dangling quantifier" in str(error)
+    assert "no operand" in str(error)
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