Description of problem:
Package python-httpretty fails to build from source in Fedora Rawhide.

Version-Release number of selected component (if applicable):
1.1.4-38.fc45

Steps to Reproduce:
koji build --scratch f45 python-httpretty-1.1.4-38.fc45.src.rpm

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/python-httpretty

Reproducible: Always

Actual Results:
Traceback (most recent call last):
  File "/usr/lib/rpm/redhat/pyproject_buildrequires.py", line 850, in main
    generate_requires(
    ~~~~~~~~~~~~~~~~~^
        include_runtime=args.runtime,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<12 lines>...
        dependency_overrides=dependency_overrides,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/rpm/redhat/pyproject_buildrequires.py", line 721, in generate_requires
    raise ValueError(
    ...<2 lines>...
    )
ValueError: Extra testing does not exist in upstream metadata. Available extras: [].