/**
* Test that we can remove related competencies.
*
* @return void
*/
public function test_remove_related_competency()
{
$this->setUser($this->creator);
$lpg = $this->getDataGenerator()->get_plugin_generator('core_competency');
$framework = $lpg->create_framework();
$c1 = $lpg->create_competency(array('competencyframeworkid' => $framework->get_id()));
$c2 = $lpg->create_competency(array('competencyframeworkid' => $framework->get_id()));
$c3 = $lpg->create_competency(array('competencyframeworkid' => $framework->get_id()));
$rc1 = $lpg->create_related_competency(array('competencyid' => $c1->get_id(), 'relatedcompetencyid' => $c2->get_id()));
$rc2 = $lpg->create_related_competency(array('competencyid' => $c2->get_id(), 'relatedcompetencyid' => $c3->get_id()));
$this->assertEquals(2, related_competency::count_records());
// Returns false when the relation does not exist.
$result = external::remove_related_competency($c1->get_id(), $c3->get_id());
$result = external_api::clean_returnvalue(external::remove_related_competency_returns(), $result);
$this->assertFalse($result);
// Returns true on success.
$result = external::remove_related_competency($c2->get_id(), $c3->get_id());
$result = external_api::clean_returnvalue(external::remove_related_competency_returns(), $result);
$this->assertTrue($result);
$this->assertEquals(1, related_competency::count_records());
// We don't need to specify competencyid and relatedcompetencyid in the right order.
$result = external::remove_related_competency($c2->get_id(), $c1->get_id());
$result = external_api::clean_returnvalue(external::remove_related_competency_returns(), $result);
$this->assertTrue($result);
$this->assertEquals(0, related_competency::count_records());
}