alternative to PR "improve code quality" (#21464)

This PR doesn't require new git version, and can be backported easily.

Co-authored-by: 6543 <6543@obermui.de>

modules/git/command_test.go

@@ -26,4 +26,21 @@ func TestRunWithContextStd(t *testing.T) {
 		assert.Contains(t, err.Error(), "exit status 129 - unknown option:")
 		assert.Empty(t, stdout)
 	}
+
+	assert.Panics(t, func() {
+		cmd = NewCommand(context.Background())
+		cmd.AddDynamicArguments("-test")
+	})
+
+	assert.Panics(t, func() {
+		cmd = NewCommand(context.Background())
+		cmd.AddDynamicArguments("--test")
+	})
+
+	subCmd := "version"
+	cmd = NewCommand(context.Background()).AddDynamicArguments(subCmd) // for test purpose only, the sub-command should never be dynamic for production
+	stdout, stderr, err = cmd.RunStdString(&RunOpts{})
+	assert.NoError(t, err)
+	assert.Empty(t, stderr)
+	assert.Contains(t, stdout, "git version")
 }