1 files changed, 153 insertions, 0 deletions
diff --git a/tests/errors/errors.test.py b/tests/errors/errors.test.py
new file mode 100644
index 0000000..12cfcd5
--- /dev/null
+++ b/tests/errors/errors.test.py
@@ -0,0 +1,153 @@
+from edify.errors.anchors import (
+    CannotDefineStartAfterEndError,
+    EndInputAlreadyDefinedError,
+    StartInputAlreadyDefinedError,
+)
+from edify.errors.captures import InvalidTotalCaptureGroupsIndexError
+from edify.errors.input import (
+    MustBeAStringError,
+    MustBeInstanceError,
+    MustBeIntegerGreaterThanZeroError,
+    MustBeLessThanError,
+    MustBeOneCharacterError,
+    MustBePositiveIntegerError,
+    MustBeSingleCharacterError,
+    MustHaveASmallerValueError,
+)
+from edify.errors.internal import (
+    FailedToCompileRegexError,
+    NonFusableElementError,
+    UnexpectedFrameTypeError,
+    UnknownElementTypeError,
+)
+from edify.errors.naming import (
+    CannotCreateDuplicateNamedGroupError,
+    NamedGroupDoesNotExistError,
+    NameNotValidError,
+)
+from edify.errors.structure import (
+    CannotCallSubexpressionError,
+    CannotEndWhileBuildingRootExpressionError,
+)
+
+
+def test_start_input_already_defined_outside_subexpression():
+    error = StartInputAlreadyDefinedError()
+    assert "already has a start" in str(error)
+    assert "ignore_start_and_end" not in str(error)
+
+
+def test_start_input_already_defined_in_subexpression():
+    error = StartInputAlreadyDefinedError(in_subexpression=True)
+    assert "ignore_start_and_end" in str(error)
+
+
+def test_end_input_already_defined_outside_subexpression():
+    error = EndInputAlreadyDefinedError()
+    assert "already has an end" in str(error)
+    assert "ignore_start_and_end" not in str(error)
+
+
+def test_end_input_already_defined_in_subexpression():
+    error = EndInputAlreadyDefinedError(in_subexpression=True)
+    assert "ignore_start_and_end" in str(error)
+
+
+def test_cannot_define_start_after_end():
+    error = CannotDefineStartAfterEndError()
+    assert "start of input after defining an end" in str(error)
+
+
+def test_invalid_total_capture_groups_index():
+    error = InvalidTotalCaptureGroupsIndexError(5, 3)
+    assert "Invalid index #5" in str(error)
+    assert "only 3 capture groups" in str(error)
+
+
+def test_must_be_a_string():
+    error = MustBeAStringError("Name", "int")
+    assert "Name must be a string" in str(error)
+    assert "int" in str(error)
+
+
+def test_must_be_one_character():
+    error = MustBeOneCharacterError("Value")
+    assert "Value must be one character long" in str(error)
+
+
+def test_must_be_single_character():
+    error = MustBeSingleCharacterError("Value", "str")
+    assert "Value must be a single character" in str(error)
+    assert "str" in str(error)
+
+
+def test_must_be_positive_integer():
+    error = MustBePositiveIntegerError("count")
+    assert "count must be a positive integer" in str(error)
+
+
+def test_must_be_integer_greater_than_zero():
+    error = MustBeIntegerGreaterThanZeroError("x")
+    assert "x must be an integer greater than zero" in str(error)
+
+
+def test_must_be_instance():
+    error = MustBeInstanceError("Expression", "str", "RegexBuilder")
+    assert "Expression must be an instance of RegexBuilder" in str(error)
+    assert "str" in str(error)
+
+
+def test_must_have_a_smaller_value():
+    error = MustHaveASmallerValueError("z", "a")
+    assert "z must have a smaller character value than a" in str(error)
+
+
+def test_must_be_less_than():
+    error = MustBeLessThanError("X", "Y")
+    assert "X must be less than Y" in str(error)
+
+
+def test_name_not_valid():
+    error = NameNotValidError("bad name")
+    assert "Name bad name is not valid" in str(error)
+
+
+def test_cannot_create_duplicate_named_group():
+    error = CannotCreateDuplicateNamedGroupError("dup")
+    assert 'Can not create duplicate named group "dup"' in str(error)
+
+
+def test_named_group_does_not_exist():
+    error = NamedGroupDoesNotExistError("missing")
+    assert 'Named group "missing" does not exist' in str(error)
+
+
+def test_cannot_end_while_building_root_expression():
+    error = CannotEndWhileBuildingRootExpressionError()
+    assert "Can not end while building the root expression" in str(error)
+
+
+def test_cannot_call_subexpression():
+    error = CannotCallSubexpressionError("capture")
+    assert "Can not call subexpression" in str(error)
+    assert "capture" in str(error)
+
+
+def test_unknown_element_type():
+    error = UnknownElementTypeError("WeirdElement")
+    assert "WeirdElement" in str(error)
+
+
+def test_non_fusable_element():
+    error = NonFusableElementError("DigitElement")
+    assert "Cannot fuse element of type DigitElement" in str(error)
+
+
+def test_unexpected_frame_type():
+    error = UnexpectedFrameTypeError("DigitElement")
+    assert "Stack frame anchored at unexpected element type DigitElement" in str(error)
+
+
+def test_failed_to_compile_regex():
+    error = FailedToCompileRegexError("missing )")
+    assert "Cannot compile regex: missing )" in str(error)