Tests that we can find a record without a NULL value.
function testIsNotNullCondition() {
$this
->ensureSampleDataNull();
$names = db_select('test_null', 'tn')
->fields('tn', array(
'name',
))
->isNotNull('tn.age')
->orderBy('name')
->execute()
->fetchCol();
$this
->assertEqual(count($names), 2, 'Correct number of records found withNOT NULL age.');
$this
->assertEqual($names[0], 'Gonzo', 'Correct record returned for NOT NULL age.');
$this
->assertEqual($names[1], 'Kermit', 'Correct record returned for NOT NULL age.');
}