class CliBuilderTest extends GroovyTestCase {    void testSample() {        def writer = new StringWriter()        def cli = new CliBuilder(usage:'groovy [option]* filename', writer: new PrintWriter(writer))        cli.h(longOpt: 'help', 'usage information')        cli.c(argName: 'charset', args:1, longOpt: 'encoding', 'character encoding')        cli.i(argName: 'extension', optionalArg: true,             "modify files in place, create backup if extension is given (e.g. \'.bak\')")        def stringified = cli.options.toString()        assert stringified =~ /i=. option: i  :: modify files in place, create backup if extension is given/        assert stringified =~ /c=. option: c encoding  :: character encoding/        assert stringified =~ /h=. option: h help  :: usage information/        assert stringified =~ /encoding=. option: c encoding  :: character encoding/        assert stringified =~ /help=. option: h help  :: usage information/        def options = cli.parse(['-h','-c','ASCII'])        assert options.hasOption('h')        assert options.h        if (options.h) cli.usage()        assert writer.toString().tokenize("\r\n").join("\n") =='''usage: groovy [option]* filename -c,--encoding <charset>   character encoding -h,--help                 usage information -i                        modify files in place, create backup if                           extension is given (e.g. '.bak')'''        assert options.hasOption('c')        assert options.c        assertEquals 'ASCII', options.getOptionValue('c')        assertEquals 'ASCII', options.c        assertEquals false, options.encoding        assertEquals false, options.noSuchOptionGiven        assertEquals false, options.x    }    void testMultipleArgs() {        def cli = new CliBuilder()        cli.a(longOpt:'arg', args:2, valueSeparator:',' as char, 'arguments')        def options = cli.parse(['-a','1,2'])        assertEquals '1', options.a        assertEquals(['1','2'], options.as)        assertEquals false, options.arg        assertEquals(false, options.args)    }    void testArgs() {        def cli = new CliBuilder()        cli.a([:],'')        def options = cli.parse(['-a','1','2'])        assertEquals(['1','2'], options.arguments())    }    void testFailedParsePrintsUsage() {        def writer = new StringWriter()        def cli = new CliBuilder(writer: new PrintWriter(writer))        cli.x(required:true, 'message')        def options = cli.parse([])        assert writer.toString().tokenize("\r\n").join("\n") =='''error: -xusage: groovy -x   message'''    }}