Validate completed options

Signed-off-by: Nelo-T. Wallus <red.brush9525@fastmail.com>
Signed-off-by: Nelo-T. Wallus <n.wallus@sap.com>

Author: ntnn

test/e2e/framework/backend.go

@@ -85,6 +85,7 @@ func StartBackendWithoutDefaultArgs(t *testing.T, clientConfig *rest.Config, arg
 
 	completed, err := opts.Complete()
 	require.NoError(t, err)
+	require.NoError(t, completed.Validate())
 
 	config, err := backend.NewConfig(completed)
 	require.NoError(t, err)