Pinq\Iterators\ISet::contains PHP 메소드

    public function contains($value);

 /**
  * @dataProvider sets
  */
 public function testThatSetContainsReturnsWhetherElementIsAdded(ISet $set)
 {
     $set->add(0);
     $set->add(1);
     $this->assertFalse($set->contains('0'));
     $this->assertFalse($set->contains('1'));
     $this->assertFalse($set->contains(1.0));
     $this->assertTrue($set->contains(0));
     $this->assertTrue($set->contains(1));
 }