CI: include tests in coverage (#48719)

cover tests

Co-authored-by: MarcoGorelli <>

Author: MarcoGorelli

setup.cfg

@@ -184,7 +184,6 @@ ignore-regex = https://([\w/\.])+
 [coverage:run]
 branch = True
 omit =
-    */tests/*
     pandas/_typing.py
     pandas/_version.py
 plugins = Cython.Coverage