TEST_UTIL_System_assertDateSetEquals.cls

@isTest(SeeAllData = false)
private class TEST_UTIL_System_assertDateSetEquals
{
    static testMethod void doTest()
    {
        Test.startTest();

        Set<Date> set1 = new Set<Date>();
        set1.add(system.today());
        Set<Date> set2  = new Set<Date>();
        set2.add(system.today());
        
        String message = DAL_BaseObject.generateRandomName();

        try
        {        
            UTIL_System.assertDateSetEquals(set1, new Set<Date>(),  message);
            system.assert(false, 'TEST 0. Dates are not equal. This exception must be thrown.');
        }
        catch(UTIL_System.AssertionException anAssertionException)
        {
            
        }

        try
        {        
            UTIL_System.assertDateSetEquals(set1, set2,  message);
        }
        catch(UTIL_System.AssertionException anAssertionException)
        {
            system.assert(false, 'TEST 1. Dates are equal. This exception must be not thrown.');
        }
        
        try
        {        
            set2  = new Set<Date>();
            set2.add(system.today().addDays(1));
            UTIL_System.assertDateSetEquals(set1, set2,  message);
            system.assert(false, 'TEST 2. Dates are not equal. This exception must be thrown.');
        }
        catch(UTIL_System.AssertionException anAssertionException)
        {
            
        }
        Test.stopTest();
    }
}