public function testRemoveRelationManyToManyOne()
{
$objectA = self::$MtmaMapper->findOne(2);
$objectB1 = self::$MtmbMapper->findOne(12);
$objectB2 = self::$MtmbMapper->findOne(14);
$objectA->removeRelation('manybs', $objectB1);
$this->assertFalse($objectA->hasRelation('manybs', $objectB1));
$this->assertTrue($objectA->hasRelation('manybs', $objectB2));
}