Laravel AssertJsonCount on a nested array - json

Question

How can I call assertJsonCount using an indexed, nested array?
In my test, the following JSON is returned:
[[{"sku":"P09250"},{"sku":"P03293"}]]
But attempting to use assertJsonCount returns the following error:
$response->assertJsonCount(2);
// Failed asserting that actual size 1 matches expected size 2.

Answer 1

This may or may not be specific to Laravel. Although a Laravel helper is involved, this issue may occur elsewhere.
assertJsonCount utilises the PHPUnit function PHPUnit::assertCount which uses a laravel helper data_get, which has the following signature:
/**
* Get an item from an array or object using "dot" notation.
*
* #param mixed $target
* #param string|array|int $key
* #param mixed $default
* #return mixed
*/
function data_get($target, $key, $default = null)
{
if (is_null($key)) {
return $target;
}
...
We can see that the JSON returned is a nested array, so logically we should pass in a key of 0.
$response->assertJsonCount($expectedProducts->count(), '0');
However this will be ignored as assertCount function checks if a key has been passed using is_null.
To overcome this, we can count all children of 0:
$response->assertJsonCount($expectedProducts->count(), '0.*');
This will produce the desired result.