Translate test cases contributed from foreign project in scala

[jmrozanec]

@francisdb provided the following tests when discussing issue #89
Tests should be merged into out codebase, to cover a broader set of cases.

"Validating a cron expression" should {
"succeed for a valid cron expression 0 0/15 * * * ?" in {
  CronUtil.validateCronExpression("0 0/15 * * * ?", true)
  success
}

"throw an exception when given an invalid cron expression for quartz" in {
  CronUtil.validateCronExpression("0 30 17 4 1 * 2016", false) must throwA[IllegalArgumentException](
    Pattern.quote("Both, a day-of-week AND a day-of-month parameter, are not supported.")
  )
}

"throw an exception for invalid cron expression with unknown char" in {
  CronUtil.validateCronExpression("* * * * $ ?", false) must throwA[IllegalArgumentException](
    // TODO should be better with https://github.com/jmrozanec/cron-utils/issues/89
    Pattern.quote("""java.lang.NumberFormatException: For input string: "$"""")
  )
}

"for an invalid quartz cron expression throw an exception with message containing the actual expression" in {
  skipped("https://github.com/jmrozanec/cron-utils/issues/90")
  CronUtil.validateCronExpression("0/1 * * * * *", false) must throwA[IllegalArgumentException](
    Pattern.quote("""Invalid cron expression: 0/1 * * * * *. Both, a day-of-week AND a day-of-month parameter, are not supported.""")
  )
 }
}

"Calculating the minimum interval for a cron expression" should {
"be 1 for * * * * * ?" in {
  CronUtil.getShortestPeriodSeconds("* * * * * ?", Duration.ZERO) must be equalTo Duration.ofSeconds(1)
}

"be 1 for *   *    *  *       * ? (ignore whitespace)" in {
  CronUtil.getShortestPeriodSeconds("* * * * * ?", Duration.ZERO) must be equalTo Duration.ofSeconds(1)
}

"be 1 for 0/1 * * * * ?" in {
  CronUtil.getShortestPeriodSeconds("0/1 * * * * ?", Duration.ZERO) must be equalTo Duration.ofSeconds(1)
}

"be 1 for */1 * * * * ?" in {
  CronUtil.getShortestPeriodSeconds("*/1 * * * * ?", Duration.ZERO) must be equalTo Duration.ofSeconds(1)
}

"be 60 for 0 * * * * ?" in {
  CronUtil.getShortestPeriodSeconds("0 * * * * ?", Duration.ZERO) must be equalTo Duration.ofMinutes(1)
}

"be 60 for 0 */1 * * * ?" in {
  CronUtil.getShortestPeriodSeconds("0 */1 * * * ?", Duration.ZERO) must be equalTo Duration.ofMinutes(1)
}

"be 300 for 0 */5 * * * ?" in {
  CronUtil.getShortestPeriodSeconds("0 */5 * * * ?", Duration.ZERO) must be equalTo Duration.ofMinutes(5)
}

"be 3600 for 0 0 * * * ?" in {
  CronUtil.getShortestPeriodSeconds("0 0 * * * ?", Duration.ZERO) must be equalTo Duration.ofHours(1)
}

"be 10800 for 0 0 */3 * * ?" in {
  CronUtil.getShortestPeriodSeconds("0 0 */3 * * ?", Duration.ZERO) must be equalTo Duration.ofHours(3)
}

"be 86400 for 0 0 0 * * ?" in {
  CronUtil.getShortestPeriodSeconds("0 0 0 * * ?", Duration.ofDays(1)) must be equalTo Duration.ofDays(1)
}

"throw an exception for invalid cron expression * *" in {
  CronUtil.getShortestPeriodSeconds("* *", Duration.ZERO) must throwA[IllegalArgumentException](
    Pattern.quote("Cron expression contains 2 parts but we expect one of [6, 7]")
  )
}

"throw an exception for invalid cron expression */ * * * * ?" in {
  CronUtil.getShortestPeriodSeconds("*/ * * * * ?", Duration.ZERO) must throwA[IllegalArgumentException](
    Pattern.quote("Missing steps for expression: */")
  )
}

"throw an exception for invalid cron expression with unknown char" in {
  CronUtil.getShortestPeriodSeconds("* * * * $ ?", Duration.ZERO) must throwA[IllegalArgumentException](
    // TODO should be better with https://github.com/jmrozanec/cron-utils/issues/89
    Pattern.quote("""java.lang.NumberFormatException: For input string: "$"""")
  )
}

[jmrozanec]

@thachhoang thank you for contributing this!