CLI: Allow spaces in -p arguments

AUTHORS

@@ -376,6 +376,7 @@ Wouter van Ackooy
 Xixi Zhao
 Xuan Luong
 Xuecong Liao
+Yannick Péroux
 Yoav Caspi
 Yusuke Kadowaki
 Yuval Shimon

changelog/10658.improvement.rst

@@ -0,0 +1,3 @@
+Allow ``-p`` arguments to include spaces (eg: ``-p no:logging`` instead of
+``-pno:logging``). Mostly useful in the ``addopts`` section of the configuration
+file.

src/_pytest/config/__init__.py

@@ -697,6 +697,7 @@ def consider_preparse(
                     parg = opt[2:]
                 else:
                     continue
+                parg = parg.strip()
                 if exclude_only and not parg.startswith("no:"):
                     continue
                 self.consider_pluginarg(parg)

testing/test_config.py

@@ -1809,6 +1809,10 @@ def test_config_does_not_load_blocked_plugin_from_args(pytester: Pytester) -> No
     result.stderr.fnmatch_lines(["*: error: unrecognized arguments: -s"])
     assert result.ret == ExitCode.USAGE_ERROR
 
+    result = pytester.runpytest(str(p), "-p no:capture", "-s")
+    result.stderr.fnmatch_lines(["*: error: unrecognized arguments: -s"])
+    assert result.ret == ExitCode.USAGE_ERROR
+
 
 def test_invocation_args(pytester: Pytester) -> None:
     """Ensure that Config.invocation_* arguments are correctly defined"""