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backend/venv/Lib/site-packages/hypothesis/extra/dpcontracts.py

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+# This file is part of Hypothesis, which may be found at
+# https://github.com/HypothesisWorks/hypothesis/
+#
+# Copyright the Hypothesis Authors.
+# Individual contributors are listed in AUTHORS.rst and the git log.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/.
+
+"""
+-----------------------
+hypothesis[dpcontracts]
+-----------------------
+
+This module provides tools for working with the :pypi:`dpcontracts` library,
+because `combining contracts and property-based testing works really well
+<https://hillelwayne.com/talks/beyond-unit-tests/>`_.
+
+It requires ``dpcontracts >= 0.4``.
+"""
+
+from dpcontracts import PreconditionError
+
+from hypothesis import reject
+from hypothesis.errors import InvalidArgument
+from hypothesis.internal.reflection import proxies
+
+
+def fulfill(contract_func):
+    """Decorate ``contract_func`` to reject calls which violate preconditions,
+    and retry them with different arguments.
+
+    This is a convenience function for testing internal code that uses
+    :pypi:`dpcontracts`, to automatically filter out arguments that would be
+    rejected by the public interface before triggering a contract error.
+
+    This can be used as ``builds(fulfill(func), ...)`` or in the body of the
+    test e.g. ``assert fulfill(func)(*args)``.
+    """
+    if not hasattr(contract_func, "__contract_wrapped_func__"):
+        raise InvalidArgument(
+            f"{contract_func.__name__} has no dpcontracts preconditions"
+        )
+
+    @proxies(contract_func)
+    def inner(*args, **kwargs):
+        try:
+            return contract_func(*args, **kwargs)
+        except PreconditionError:
+            reject()
+
+    return inner