Expose ValidationError for backwards compatibility

eth_keys/exceptions.py

@@ -1,2 +1,7 @@
+# This exposes the eth-utils exception for backwards compatibility,
+# for any library that catches eth_keys.exceptions.ValidationError
+from eth_utils import ValidationError  # noqa: F401
+
+
 class BadSignature(Exception):
     pass

tests/core/test_key_and_signature_datastructures.py

@@ -15,6 +15,7 @@
 
 from eth_keys import KeyAPI
 from eth_keys.backends import NativeECCBackend
+from eth_keys.exceptions import ValidationError as EthKeysValidationErrorCopy
 
 
 MSG = b'message'
@@ -155,12 +156,17 @@ def test_compressed_bytes_conversion(key_api, private_key):
     assert key_api.PublicKey.from_compressed_bytes(compressed_bytes) == public_key
 
 
-def test_compressed_bytes_validation(key_api, private_key):
+@pytest.mark.parametrize('validation_error', (ValidationError, EthKeysValidationErrorCopy))
+def test_compressed_bytes_validation(key_api, private_key, validation_error):
     valid_key = private_key.public_key.to_compressed_bytes()
 
-    with pytest.raises(ValidationError):
+    with pytest.raises(validation_error):
         key_api.PublicKey.from_compressed_bytes(valid_key + b"\x00")
-    with pytest.raises(ValidationError):
+    with pytest.raises(validation_error):
         key_api.PublicKey.from_compressed_bytes(valid_key[:-1])
-    with pytest.raises(ValidationError):
+    with pytest.raises(validation_error):
         key_api.PublicKey.from_compressed_bytes(b"\x04" + valid_key[1:])
+
+
+def test_validation_error_is_from_eth_utils():
+    assert EthKeysValidationErrorCopy is ValidationError