public function testIsVector()
{
$this->assertEquals(true, Arr::isVector(array("1", "3", "aaaa")));
$this->assertEquals(true, Arr::isVector(array(1, 2, 3)));
$this->assertEquals(true, Arr::isVector(array(1, 2, "aaaa")));
$this->assertEquals(true, Arr::isVector(array()));
$this->assertEquals(false, Arr::isVector(array("a" => "bb", "c" => "dd")));
}