public function testGroupRanges()
{
$r1 = new Reference();
$r1->addBookChapterAndVerseRange(1, 2, 6, 7);
$r1->addBookChapterAndVerseRange(1, 2, 10, 14);
$r1->addBookChapterAndVerseRange(1, 3, 2, 4);
$groups = $r1->groupRanges();
$this->assertEquals(2, count($groups));
list($group1, $group2) = $groups;
$this->assertEquals(2, count($group1));
$this->assertEquals(1, count($group2));
// Overlapping chapter...
$r2 = new Reference();
$r2->addBookAndChapter(1, 2);
$r2->addBookChapterAndVerse(1, 3, 1);
$r2->addBookChapterAndVerseRange(1, 3, 7, 8);
$groups = $r2->groupRanges();
$this->assertEquals(2, count($groups));
list($group1, $group2) = $groups;
$this->assertEquals(1, count($group1));
$this->assertEquals(1, count($group2));
// matt+18;19.1,3,5,7 -> 18:1-19:1; 19:3,5,7
$r3 = new Reference();
$r3->addBookAndChapter(1, 18);
$r3->addBookChapterAndVerse(1, 19, 1);
$r3->addBookChapterAndVerse(1, 19, 3);
$r3->addBookChapterAndVerse(1, 19, 5);
$r3->addBookChapterAndVerse(1, 19, 7);
$groups = $r3->groupRanges();
$this->assertEquals(2, count($groups));
list($group1, $group2) = $groups;
$this->assertEquals(1, count($group1));
$this->assertEquals(3, count($group2));
}