We do not have this optional test dependency packaged yet.

--- subprocess_tee-0.4.2/pyproject.toml.orig
+++ subprocess_tee-0.4.2/pyproject.toml
@@ -67,7 +67,6 @@
 ]
 test =[
     "pytest-cov>=2.12.1",
-    "pytest-plus>=0.2",
     "pytest-xdist>=2.3.0",
     "pytest>=6.2.5",
 ]