$this->assertNotEquals($newValue, $received, 'Value was wrongly overwritten by add');
$this->assertEquals($value, $received, 'Value was wrongly overwritten by any other value');
$this->instance->delete('value1');
$this->instance->add('value1', $newValue);
$this->assertNotEquals($newValue, $received, 'Value was wrongly overwritten by add');
$this->assertEquals($value, $received, 'Value was wrongly overwritten by any other value');
$this->instance->delete('value1');
$this->instance->add('value1', $newValue);