public function testHasMergeMode()
 {
     $mergeModes = array(MergeModes::REPLACE);
     $this->fieldMetadata->set('merge_modes', $mergeModes);
     $this->assertTrue($this->fieldMetadata->hasMergeMode(MergeModes::REPLACE));
     $this->assertFalse($this->fieldMetadata->hasMergeMode(MergeModes::UNITE));
 }