How to check the value of an option in a unit test for Picocli

[Oliver Fischer]

Dear all,

In a unit test for a utility using picocli, I would like to assert that picocli assigned the correct value to the option. How can I get the value associated with an option in a unit test?

Here is the current version of the unit test:

@Test
void callWithOptionForSuffix() {
    NextMajorSubcommand command = new NextMajorSubcommand();
    CommandLine cmdline = new CommandLine(command);

    ParseResult parseResult = cmdline.parseArgs("--suffix", "DELTA", "4.5.6");

    assertThat(parseResult.hasMatchedPositional(0)).isTrue();
    assertThat(parseResult.matchedOptions()).isNotEmpty();
    assertThat(parseResult.matchedOption("--suffix").isOption());
}

How can I do that?

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N Oliver B. Fischer
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[Remko Popma]

Hi Oliver,

Some ideas using the ParseResult:

assertEquals(parseResult.matchedOption("--suffix").getValue(), "DELTA");

or

assertEquals(parseResult.matchedOptionValue("--suffix", null), "DELTA");

alternatively you can query the  NextMajorSubcommand object (if it has visible getters):

assertEquals(command.getSuffix(), "DELTA");

[Oliver Fischer]

Hi Remko,

Thank you for your hint to getValue() I figured out, that the correct assertion is this one:

assertThat(parseResult.matchedOption("--suffix").<Optional<String>>getValue()).hasValue("DELTA");

BTW: Picocli is awesome. I will use it also for the command line distribution of jQAssistant

Am 09.09.21 um 00:24 schrieb Remko Popma:

Hi Oliver,

Some ideas using the ParseResult:

assertEquals(parseResult.matchedOption("--suffix").getValue(), "DELTA");

or

assertEquals(parseResult.matchedOptionValue("--suffix", null), "DELTA");

alternatively you can query the  NextMajorSubcommand object (if it has visible getters):

assertEquals(command.getSuffix(), "DELTA");