I have a parameter named --msg-content-list-item
public class CliProtonJ2Sender implements Callable<Integer> {
@CommandLine.Option(
names = {"--msg-content-list-item"},
arity = "0..1",
defaultValue = CommandLine.Option.NULL_VALUE)
private List<String> msgContentListItem;
// ...
}
I wish for the following test to pass
@Test
void test_msgContentListItem() {
CliProtonJ2Sender a = new CliProtonJ2Sender();
CommandLine b = new CommandLine(a);
CommandLine.ParseResult r = b.parseArgs("--msg-content-list-item", "--msg-content-list-item", "pepa");
// https://github.com/powermock/powermock/wiki/Bypass-Encapsulation
List<String> v = Whitebox.getInternalState(a, "msgContentListItem", a.getClass());
assertThat(v).containsExactly(null, "pepa");
}
But it doesn't and I get
missing (1): null
---
expected : [null, pepa]
but was : [pepa]
How do I define @CommandLine.Option to behave the way I want?
There was a bug which is now fixed.
Prior to version 4.7.2, use the workaround in my other answer.
As of picocli 4.7.2, use the fallbackValue like this
@Option(names = {"--list"}, arity = "0..1", fallbackValue = CommandLine.Option.NULL_VALUE)
List<String> list;