public function testEqualEmpty() { $filter = new Filter(); $filter->setFromColumn($this->column, '='); $this->assertEquals(Filter::EQUAL, $filter->getOperator()); $this->assertEquals('= ', $filter->getDisplayColumnValue()); $this->assertTrue(is_array($filter->getValues())); $this->assertEquals(array(''), $filter->getValues()); $this->assertTrue($filter->isColumnFilter()); }