By default, mocking Subprocess from webkticorepy will intercept all subprocess calls. When working on https://bugs.webkit.org/show_bug.cgi?id=218407, we needed a way to fallback to the actual Popen call in some cases. The change in https://bugs.webkit.org/show_bug.cgi?id=218407 will not be landing, but the Popen fallback is still a good idea.
<rdar://problem/71306029>
Created attachment 413890 [details] Patch