PHP Unit Test with deferred Page Props

[felix-droese]

Hi, in a Laravel + Vue Setup,

I would like to test the proper initialization of a deferred prop:

In my controller, I return this prop to the page:

'timesheet' => Inertia::defer(fn () => $timesheetService->timesheet($employee)),

And my test looks like this:

$response = $this->get(route('site::analysis.timesheet', [
    'employee_id' => $employee->id,
    'start_date' => $startDate->toIso8601String(),
    'end_date' => $endDate->toIso8601String(),
]))->assertInertia(fn (AssertableInertia $page) => $page
        ->has('timesheet')
);

$tTimesheet = $response->original['page']['props']['timesheet'];

I get the output:

Property [timesheet] does not exist.

Is it possible to test deferred props? If yes, how?

[jeroensijbom]

Hi Felix, I had the same issue and I dont think there is a way to test deferred props at the moment. The response of your test is correct because property is deferred and not part of the Inertia response. So what I did is, I removed the has() on deferred properties, and just check if the component (component()) is there and maybe other non-deferred properties. And make a second call (which basically happens with the defer option) and assert on a json response like this:

$this->withHeaders([
            'X-Inertia'                   => 'true',
            'X-Inertia-Partial-Component' => 'your-component-name',
            'X-Inertia-Partial-Data'      => implode(',', ['prop1', 'prop2']),
            'X-Inertia-Version'           => Inertia::getVersion(),
        ])
->get(route('route.name))
->assertJsonCount(1, 'props.prop1')
->assertJsonCount(2,'props.prop2')

Hope that helps!