Check if config args and args_source exist

AUTHORS

@@ -290,6 +290,7 @@ Prashant Sharma
 Pulkit Goyal
 Punyashloka Biswal
 Quentin Pradet
+q0w
 Ralf Schmitt
 Ralph Giles
 Ram Rachum

changelog/10626.bugfix.rst

@@ -0,0 +1 @@
+Check if ``Config.args`` and ``Config.args_source`` exist.

src/_pytest/main.py

@@ -619,7 +619,7 @@ def perform_collect(  # noqa: F811
         and ``session.items`` is empty.
         """
         if args is None:
-            args = self.config.args
+            args = self.config.args if hasattr(self.config, "args") else ()
 
         self.trace("perform_collect", self, args)
         self.trace.root.indent += 1

src/_pytest/terminal.py

@@ -737,8 +737,10 @@ def pytest_report_header(self, config: Config) -> List[str]:
 
         if config.inipath:
             line += ", configfile: " + bestrelpath(config.rootpath, config.inipath)
-
-        if config.args_source == Config.ArgsSource.TESTPATHS:
+        if (
+            hasattr(config, "args_source")
+            and config.args_source == Config.ArgsSource.TESTPATHS
+        ):
             testpaths: List[str] = config.getini("testpaths")
             line += ", testpaths: {}".format(", ".join(testpaths))
 

testing/python/fixtures.py

@@ -3338,6 +3338,10 @@ def test_funcarg_compat(self, pytester: Pytester) -> None:
         config = pytester.parseconfigure("--funcargs")
         assert config.option.showfixtures
 
+    def test_show_help(self, pytester: Pytester) -> None:
+        result = pytester.runpytest("--fixtures", "--help")
+        assert not result.ret
+
     def test_show_fixtures(self, pytester: Pytester) -> None:
         result = pytester.runpytest("--fixtures")
         result.stdout.fnmatch_lines(