Backported from upstream PR: https://github.com/urfave/cli/pull/1299
---
diff --git a/app_test.go b/app_test.go
index 33024ff..6b3aaa3 100644
--- a/app_test.go
+++ b/app_test.go
@@ -513,18 +513,18 @@ func TestApp_RunAsSubcommandParseFlags(t *testing.T) {
 func TestApp_RunAsSubCommandIncorrectUsage(t *testing.T) {
 	a := App{
 		Flags: []Flag{
-			StringFlag{Name: "--foo"},
+			StringFlag{Name: "foo"},
 		},
 		Writer: bytes.NewBufferString(""),
 	}
 
 	set := flag.NewFlagSet("", flag.ContinueOnError)
-	_ = set.Parse([]string{"", "---foo"})
+	_ = set.Parse([]string{"", "-bar"})
 	c := &Context{flagSet: set}
 
 	err := a.RunAsSubcommand(c)
 
-	expect(t, err, errors.New("bad flag syntax: ---foo"))
+	expect(t, err.Error(), "flag provided but not defined: -bar")
 }
 
 func TestApp_CommandWithFlagBeforeTerminator(t *testing.T) {
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<tr><th>author</th><td>Nicolas Goaziou &lt;mail@nicolasgoaziou.fr&gt;</td><td class='right'>2023-07-13 09:19:08 +0200</td></tr>
<tr><th>committer</th><td>Nicolas Goaziou &lt;mail@nicolasgoaziou.fr&gt;</td><td class='right'>2023-07-18 18:17:35 +0200</td></tr>
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<div class='commit-subject'>gnu: Add texlive-pictex2.</div><div class='commit-msg'>* gnu/packages/tex.scm (texlive-pictex2): New variable.
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