Laravel AssertJsonCount on a nested array

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.