Instantiation with a static Factory Method

Dear SymfonyCasts,
I stumbled on warning: Undefined array key 0 on beConstructedThrough method.

Instead of calling beConstructedThrough() it is calling shouldBe() identity matcher, I think.

Code:

<?php

namespace spec\App\Entity;

use App\Entity\Dinosaur;
use PhpSpec\Exception\Example\FailureException;
use PhpSpec\ObjectBehavior;

class DinosaurSpec extends ObjectBehavior
{
    // Other methods

    function it_should_grow_a_large_velociraptor()
    {
        $this->beConstructedThrough('growVelociraptor', [5]);
// ...
    }
}

Error:

App\Entity\Dinosaur

// ....
72  ! should grow a large velociraptor
      warning: Undefined array key 0 in
      C:\...\vendor\phpspec\phpspec\src\PhpSpec\Matcher\IdentityMatcher.php
      line 53

----  broken examples

      App\Entity\Dinosaur
72  ! should grow a large velociraptor
      warning: Undefined array key 0 in
      C:\...\vendor\phpspec\phpspec\src\PhpSpec\Matcher\IdentityMatcher.php
      line 53

1 specs
9 examples (8 passed, 1 broken)
34ms

To avoid cluttering the comment section, thank you in advance for your assistance!

Cheers,
Easwaran Chinraj