Move test_package away from on-disc test fixtures

The tests in this module do not care about the content of the wheel.

Author: dnicolodi

tests/test_package.py

@@ -116,8 +116,8 @@ def test_package_signed_name_is_correct():
     assert package.signed_filename == (filename + ".asc")
 
 
-def test_package_add_attestations(tmp_path):
-    package = package_file.PackageFile.from_filename(helpers.WHEEL_FIXTURE, None)
+def test_package_add_attestations(tmp_path, test_wheel):
+    package = package_file.PackageFile.from_filename(str(test_wheel), None)
 
     assert package.attestations is None