public function testUsingTagsToDefineDependencies()
{
$op1 = new GenericOperation(1);
$op2 = new GenericOperation(2);
$op2->addTag('MyTag');
$op3 = new GenericOperation(3);
$op3->addTag('MyTag');
$op4 = new GenericOperation(4);
$op4->addTag('MyTag');
$op5 = new GenericOperation(5);
$dm = new DependencyManager();
$dm->addOperation($op1);
$dm->addOperation($op2);
$dm->addOperation($op3);
$dm->addOperation($op4);
$dm->addOperation($op5);
// 1
// / | \
// 2 3 4
// \ | /
// 5
$dm->addDependencyByTag($op1, 'MyTag');
$dm->addDependencyByTag('MyTag', $op5);
$ops = $dm->getExecutableOperations();
$this->assertCount(1, $ops);
$this->assertContains($op1, $ops);
$dm->markAsExecuted($op1);
$ops = $dm->getExecutableOperations();
$this->assertCount(3, $ops);
$this->assertContains($op2, $ops);
$this->assertContains($op3, $ops);
$this->assertContains($op4, $ops);
$dm->markAsExecuted($op2);
$dm->markAsExecuted($op3);
$dm->markAsExecuted($op4);
$ops = $dm->getExecutableOperations();
$this->assertCount(1, $ops);
$this->assertContains($op5, $ops);
}