More test help text formatting.

Author: kschwab

tests/test_source_cli.py

@@ -2088,7 +2088,7 @@ class Settings(BaseSettings, cli_parse_args=True):
         )
 
 
-def test_cli_mutually_exclusive_group(capsys):
+def test_cli_mutually_exclusive_group(capsys, monkeypatch):
     class Circle(CliMutuallyExclusiveGroup):
         radius: Optional[float] = 21
         diameter: Optional[float] = 22
@@ -2120,24 +2120,25 @@ class Settings(BaseModel):
         in capsys.readouterr().err
     )
 
-    with pytest.raises(SystemExit):
-        CliApp.run(Settings, cli_args=['--help'])
-    usage = (
+
+    with monkeypatch.context() as m:
+        m.setattr(sys, 'argv', ['example.py', '--help'])
+        with pytest.raises(SystemExit):
+            CliApp.run(Settings)
+        usage = (
         """usage: example.py [-h] [--circle-optional.radius float |
                   --circle-optional.diameter float |
                   --circle-optional.perimeter float]
                   (--circle-required.radius float |
                   --circle-required.diameter float |
                   --circle-required.perimeter float)"""
-        if sys.version_info >= (3, 13)
-        else """usage: example.py [-h]
+            if sys.version_info >= (3, 13)
+            else """usage: example.py [-h]
                   [--circle-optional.radius float | --circle-optional.diameter float | --circle-optional.perimeter float]
-                  (--circle-required.radius float | --circle-required.diameter float | --circle-required.perimeter float)
-              """
-    )
-    assert (
-        capsys.readouterr().out
-        == f"""{usage}
+                  (--circle-required.radius float | --circle-required.diameter float | --circle-required.perimeter float)"""
+        )
+        assert (
+            capsys.readouterr().out == f"""{usage}
 
 {ARGPARSE_OPTIONS_TEXT}:
   -h, --help            show this help message and exit