public function testFindDaysInRangeOverlap()
{
$base = new w2p_Utilities_Date();
$Jan_01_2010 = new w2p_Utilities_Date('2010-01-01');
$Jan_15_2010 = new w2p_Utilities_Date('2010-01-15');
$Jan_01_2011 = new w2p_Utilities_Date('2011-01-01');
$Jan_15_2011 = new w2p_Utilities_Date('2011-01-15');
$Jan_31_2011 = new w2p_Utilities_Date('2011-01-31');
$Feb_15_2011 = new w2p_Utilities_Date('2011-02-15');
$Jan_16_2012 = new w2p_Utilities_Date('2012-01-16');
$Jan_31_2012 = new w2p_Utilities_Date('2012-01-31');
// No overlap, Range B after Range A
$this->assertEquals(0, $base->findDaysInRangeOverlap($Jan_01_2011, $Jan_15_2011, $Jan_16_2012, $Jan_31_2012));
// No overlap, Range B before Range A
$this->assertEquals(0, $base->findDaysInRangeOverlap($Jan_01_2011, $Jan_15_2011, $Jan_01_2010, $Jan_15_2010));
// Range B exactly matches Range A
$Jan_01_2011 = new w2p_Utilities_Date('2011-01-01');
$Jan_31_2011 = new w2p_Utilities_Date('2011-01-31');
$this->assertEquals(21, $base->findDaysInRangeOverlap($Jan_01_2011, $Jan_31_2011, $Jan_01_2011, $Jan_31_2011));
// Range B Start within Range A, Range B End after Range A
$Jan_01_2011 = new w2p_Utilities_Date('2011-01-01');
$Jan_15_2011 = new w2p_Utilities_Date('2011-01-15');
$Jan_31_2011 = new w2p_Utilities_Date('2011-01-31');
$Feb_15_2011 = new w2p_Utilities_Date('2011-02-15');
$this->assertEquals(11, $base->findDaysInRangeOverlap($Jan_01_2011, $Jan_31_2011, $Jan_15_2011, $Feb_15_2011));
// Range A entirely within Range B
$Jan_01_2010 = new w2p_Utilities_Date('2010-01-01');
$Jan_15_2011 = new w2p_Utilities_Date('2011-01-15');
$Feb_15_2011 = new w2p_Utilities_Date('2011-02-15');
$Jan_31_2012 = new w2p_Utilities_Date('2012-01-31');
$this->assertEquals(22, $base->findDaysInRangeOverlap($Jan_15_2011, $Feb_15_2011, $Jan_01_2010, $Jan_31_2012));
// Range B entirely within Range A
$Jan_01_2010 = new w2p_Utilities_Date('2010-01-01');
$Jan_15_2011 = new w2p_Utilities_Date('2011-01-15');
$Feb_15_2011 = new w2p_Utilities_Date('2011-02-15');
$Jan_31_2012 = new w2p_Utilities_Date('2012-01-31');
$this->assertEquals(22, $base->findDaysInRangeOverlap($Jan_01_2010, $Jan_31_2012, $Jan_15_2011, $Feb_15_2011));
// Range B Start before Range A, Range B End within Range A
$Jan_01_2010 = new w2p_Utilities_Date('2010-01-01');
$Jan_15_2011 = new w2p_Utilities_Date('2011-01-15');
$Jan_31_2011 = new w2p_Utilities_Date('2011-01-31');
$Feb_15_2011 = new w2p_Utilities_Date('2011-02-15');
$this->assertEquals(11, $base->findDaysInRangeOverlap($Jan_15_2011, $Feb_15_2011, $Jan_01_2010, $Jan_31_2011));
}
