Update hypothesis to latest version

Pipfile

@@ -29,7 +29,7 @@ twilio = ">=7.0.0"
 uvloop = {version = "*", markers = "sys_platform != 'win32'"}
 
 [dev-packages]
-hypothesis = "<=6.47.1"  # Later versions add a prerelease dependency. See https://github.com/pypa/pipenv/issues/1760
+hypothesis = "*"  # Versions between 6.47.1 and 6.56.4 added a prerelease dependency. See https://github.com/pypa/pipenv/issues/1760
 pdoc3 = "*"
 pytest = "*"
 pytest-asyncio = "*"

tests/utils/hypothesis.py

@@ -1,11 +1,12 @@
 import asyncio
 import contextlib
-import inspect
 import itertools
+from inspect import Parameter, Signature
 
 import pytest
 from hypothesis.internal.reflection import (
     define_function_signature,
+    get_signature,
     impersonate
 )
 
@@ -18,13 +19,13 @@ def autocontext(*auto_args):
     that requires the `request` fixture won't work.
     """
     def decorate_test(test):
-        original_argspec = inspect.getfullargspec(test)
-        argspec = new_argspec(original_argspec, auto_args)
+        original_signature = get_signature(test)
+        signature = new_signature(original_signature, auto_args)
 
         if asyncio.iscoroutinefunction(test):
             @pytest.mark.asyncio
             @impersonate(test)
-            @define_function_signature(test.__name__, test.__doc__, argspec)
+            @define_function_signature(test.__name__, test.__doc__, signature)
             async def wrapped_test(*args, **kwargs):
                 # Tell pytest to omit the body of this function from tracebacks
                 __tracebackhide__ = True
@@ -54,7 +55,7 @@ async def wrapped_test(*args, **kwargs):
             return wrapped_test
         else:
             @impersonate(test)
-            @define_function_signature(test.__name__, test.__doc__, argspec)
+            @define_function_signature(test.__name__, test.__doc__, signature)
             def wrapped_test(*args, **kwargs):
                 # Tell pytest to omit the body of this function from tracebacks
                 __tracebackhide__ = True
@@ -77,25 +78,19 @@ def wrapped_test(*args, **kwargs):
     return decorate_test
 
 
-def new_argspec(original_argspec, auto_args):
-    """Make an updated argspec for the wrapped test."""
-    replaced_args = {
-        original_arg: auto_arg
-        for original_arg, auto_arg in zip(
-            original_argspec.args[:len(auto_args)],
-            auto_args
-        )
-    }
-    new_args = tuple(itertools.chain(
-        auto_args,
-        original_argspec.args[len(auto_args):]
+def new_signature(original_signature: Signature, auto_args):
+    """Make an updated signature for the wrapped test."""
+    # Replace the parameter names in the original signature with the names
+    # of the fixtures given to @autocontext(...) so that pytest will inject the
+    # right fixtures.
+    new_parameters = tuple(itertools.chain(
+        [
+            Parameter(name, Parameter.POSITIONAL_OR_KEYWORD)
+            for name in auto_args
+        ],
+        list(original_signature.parameters.values())[len(auto_args):]
     ))
-    annots = {
-        replaced_args.get(k) or k: v
-        for k, v in original_argspec.annotations.items()
-    }
-    annots["return"] = None
-    return original_argspec._replace(
-        args=new_args,
-        annotations=annots
+    return original_signature.replace(
+        parameters=new_parameters,
+        return_annotation=None
     )