new ruff rule

pyproject.toml

@@ -58,7 +58,6 @@ ignore = [
     "N818",  # Exception name `FooBar` should be named with an Error suffix
     "PERF",  # Perflint
     "PLC0415",  # `import` should be at the top-level of a file
-    "PLC1901",  # PLC1901 `x == ""` can be simplified to `not x` as an empty string is falsey
     "PLC2701",  # Private name import `x` from external module `y`
     "PLR0904",  # Too many public methods (x > y)
     "PLR0911",  # Too many return statements (8 > 6)
@@ -102,9 +101,10 @@ ignore = [
 # T201 == print()
 # T203 == pprint()
 # TRY003 == raise-vanilla-args
-# "B904",  # Use `raise from` to specify exception cause
+# B904 ==  Use `raise from` to specify exception cause
+# PLC1901 == `x == ""` can be simplified to `not x` as an empty string is falsey
 ".github/workflows/*" = ["B904", "EM101", "EM102", "EM103", "T201", "T203"]
-"psutil/tests/*" = ["B904", "EM101", "EM102", "EM103", "TRY003"]
+"psutil/tests/*" = ["B904", "EM101", "EM102", "EM103", "PLC1901", "TRY003"]
 "scripts/*" = ["B904", "EM101", "EM102", "EM103", "T201", "T203"]
 "scripts/internal/*" = ["B904", "EM101", "EM102", "EM103", "T201", "T203", "TRY003"]
 "setup.py" = [