SessionScheduleTest.testSettingsWithoutStartEndDayWithTimeZoneInTime() uses the timezone "EST" when it sets the Session.SETTING_START_TIME and when it sets the tz for the "current time" in the tests. It uses "US/Central" for the Session.SETTING_END_TIME.

The tests that follow assume that "US/Central" is 1 hour behind "EST". This is not always true. "US/Central" accounts for Daylight Savings and "EST" does not. So, during DST, the difference between these zones is 0 hours.

This causes the following test to fail (line 398 in version 1.3.1), because it relies on the 1 hour timezone difference:
doIsSessionTimeTest(schedule, true, 2003, 5, 5, 15, 59, 0, tz);

I suggest using "US/Eastern" instead of "EST" in this test so that the test passes year round.