Revert ghostwriter test change

hypothesis-python/tests/ghostwriter/test_ghostwriter.py

@@ -11,8 +11,6 @@
 import ast
 import enum
 import json
-import os
-import platform
 import re
 import socket
 import unittest
@@ -452,22 +450,13 @@ def test_get_imports_for_strategy(strategy, imports):
 
 
 @pytest.fixture
-def in_temp_path(tmp_path):
-    """Fixture to execute tests in a temporary path."""
-    old_path = Path.cwd()
-    os.chdir(tmp_path)
-    yield
-    os.chdir(old_path)
-
-
-@pytest.fixture
-def temp_script_file(in_temp_path):
-    """Fixture to create a script file in a temporary working directory.
-
-    Changes the working directory to a temporary directory, then yields an extant file
-    whose name will end in .py and which includes an importable function.
+def temp_script_file():
+    """Fixture to yield a Path to a temporary file in the local directory. File name will end
+    in .py and will include an importable function.
     """
     p = Path("my_temp_script.py")
+    if p.exists():
+        raise FileExistsError(f"Did not expect {p} to exist during testing")
     p.write_text(
         dedent(
             """
@@ -477,17 +466,18 @@ def say_hello():
         ),
         encoding="utf-8",
     )
-    return p
+    yield p
+    p.unlink()
 
 
 @pytest.fixture
-def temp_script_file_with_py_function(in_temp_path):
-    """Fixture to create a python file in a temporary working directory.
-
-    Changes the working directory to a temporary directory, then yields an extant file
-    whose name will end in .py and which includes an importable function named "py".
+def temp_script_file_with_py_function():
+    """Fixture to yield a Path to a temporary file in the local directory. File name will end
+    in .py and will include an importable function named "py"
     """
     p = Path("my_temp_script_with_py_function.py")
+    if p.exists():
+        raise FileExistsError(f"Did not expect {p} to exist during testing")
     p.write_text(
         dedent(
             """
@@ -497,7 +487,8 @@ def py():
         ),
         encoding="utf-8",
     )
-    return p
+    yield p
+    p.unlink()
 
 
 def test_obj_name(temp_script_file, temp_script_file_with_py_function):
@@ -519,15 +510,12 @@ def test_obj_name(temp_script_file, temp_script_file_with_py_function):
     assert e.match(
         "Remember that the ghostwriter should be passed the name of a module, not a file."
     )
-
     # File names of modules (strings ending in ".py") that exist should get a suggestion
-    if platform.system() == "Darwin":
-        return  # bad/flaky interaction between importlib and tempdirs here
     with pytest.raises(click.exceptions.UsageError) as e:
         cli.obj_name(str(temp_script_file))
     assert e.match(
         "Remember that the ghostwriter should be passed the name of a module, not a file."
-        # f"\n\tTry: hypothesis write {temp_script_file.stem}"  # flaky??
+        f"\n\tTry: hypothesis write {temp_script_file.stem}"
     )
     # File names of modules (strings ending in ".py") that define a py function should succeed
     assert isinstance(