Move check_type_error to tests.utils

tests/test_box.py

@@ -23,7 +23,7 @@
 from nacl.utils import random
 
 from .test_bindings import _box_from_seed_vectors
-
+from .test_utils import check_type_error
 
 VECTORS = [
     # privalice, pubalice, privbob, pubbob, nonce, plaintext, ciphertext
@@ -342,12 +342,6 @@ def test_box_wrong_length():
         b.decrypt(b"", b"")
 
 
-def check_type_error(expected, f, *args):
-    with pytest.raises(TypeError) as e:
-        f(*args)
-    assert expected in str(e.value)
-
-
 def test_wrong_types():
     priv = PrivateKey.generate()
 

tests/test_sealed_box.py

@@ -21,6 +21,7 @@
 from nacl.exceptions import CryptoError
 from nacl.public import PrivateKey, PublicKey, SealedBox
 
+from .test_utils import check_type_error
 from .utils import read_crypto_test_vectors
 
 
@@ -97,12 +98,6 @@ def test_sealed_box_decryption(privalice, pubalice, plaintext, encrypted):
     assert binascii.hexlify(decrypted) == plaintext
 
 
-def check_type_error(expected, f, *args):
-    with pytest.raises(TypeError) as e:
-        f(*args)
-    assert expected in str(e.value)
-
-
 def test_wrong_types():
     priv = PrivateKey.generate()
 

tests/test_signing.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import binascii
-from typing import Callable, List, Tuple, Union
+from typing import List, Tuple, Union
 
 import pytest
 
@@ -21,6 +21,7 @@
 from nacl.exceptions import BadSignatureError
 from nacl.signing import SignedMessage, SigningKey, VerifyKey
 
+from .test_utils import check_type_error
 from .utils import assert_equal, assert_not_equal, read_crypto_test_vectors
 
 
@@ -269,16 +270,6 @@ def test_key_conversion(self):
         )
 
 
-# Type safety: it's fine to use `...` here, but mypy config doesn't like it because it's
-# an explict `Any`.
-def check_type_error(  # type: ignore[misc]
-    expected: str, f: Callable[..., object], *args: object
-) -> None:
-    with pytest.raises(TypeError) as e:
-        f(*args)
-    assert expected in str(e.value)
-
-
 def test_wrong_types():
     sk = SigningKey.generate()
 

tests/test_utils.py

@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
+from typing import Callable
 
 import pytest
 
@@ -57,3 +57,13 @@ def test_deterministic_random_bytes_invalid_seed_length():
     with pytest.raises(TypeError) as e:
         nacl.utils.randombytes_deterministic(100, seed)
     assert expected in str(e.value)
+
+
+# Type safety: it's fine to use `...` here, but mypy config doesn't like it because it's
+# an explict `Any`.
+def check_type_error(  # type: ignore[misc]
+    expected: str, f: Callable[..., object], *args: object
+) -> None:
+    with pytest.raises(TypeError) as e:
+        f(*args)
+    assert expected in str(e.value)