public function testAuthor()
{
$p = new Post();
static::assertNull($p->getAuthor());
$u = new User();
static::assertCount(0, $u->getAuthoredPosts());
$p->setAuthor($u);
static::assertNotNull($p->getAuthor());
static::assertSame($u, $p->getAuthor());
static::assertCount(1, $u->getAuthoredPosts());
static::assertContains($p, $u->getAuthoredPosts());
}
/**
* Sets the Post's author.
*
* Will add this Post to the Author's authored post list.
*
* @param User $author
* @return Post
*
* @throws InvalidArgumentException
*/
public function setAuthor($author)
{
if (!$author instanceof User) {
throw new InvalidArgumentException('Author must be Instance of ' . User::class);
}
$this->author = $author;
$author->addPost($this);
return $this;
}
