Test Driven Laravel : Invalid Argument supplied for foreach - laravel

Question

So i have a form with multiple fields like below
<ul class="list-group list-group-flush">
#foreach ($group as $perm)
<li class="list-group-item">{{$perm->name}}
<div class="float-right">
<select name="perms[{{$perm->id}}]" class="form-control">
<option value="1">Yes</option>
<option value="0" selected>No</option>
</select>
</div>
</li>
#endforeach
</ul>
My controller is like below
public function permission(int $id)
{
$permission = request()->perms;
foreach ($permission as $perm => $status)
{
if($status == 1)
{
//echo $perm . " " . $status;
$user_perm = User_perms::create([
'user_id' => $id,
'perm_id' => $perm,
]);
}
}
$user = Users::find($id);
return redirect($user->path());
}
This code does what I want but I have a test
public function permissions_applied_for_user()
{
$this->withoutExceptionHandling();
//create a user
$this->post('/users/add', $this->data());
$user = Users::first();
//first clear out all data from user_perm table for specific user
$response = $this->post('/users/permission/' . $user->id, [
'user_id' => $user->id,
'perm_id' => '1',
]);
$this->assertCount(1, User_perms::all());
$response->assertRedirect('/users/view/' . $user->id);
//$response->assertOk();
//second insert all new permissions into the table
}
which throws the exception invalid argument supplied for foreach any advice on what I'm doing wrong?