Laravel 5.2 - Invalid argument supplied for foreach() - using phpunit

Question

I get the above error when testing my application with phpunit command.

public function testProductCreationFailsWhenNameNotProvided()
{
    $product = factory(\App\Product::class)->make(['name' => '']);

    $this->post(route('api.products.store'), $product->jsonSerialize())
        ->seeJson(['name' => ['The name field is required.']]) /*line 86*/
        ->assertResponseStatus(422);
}

The full error report is here:

There was 1 error:
1) ExampleTest::testProductCreationFailsWhenNameNotProvided
ErrorException: Invalid argument supplied for foreach()
C:\xampp\htdocs\product-  service\vendor\laravel\framework\src\Illuminate\Support\Arr.php:494
C:\xampp\htdocs\product-service\vendor\laravel\framework\src\Illuminate\Foundation\Testing\Concerns\MakesHttpRequests.php:231
C:\xampp\htdocs\product-service\vendor\laravel\framework\src\Illuminate\Foundation\Testing\Concerns\MakesHttpRequests.php:257
C:\xampp\htdocs\product-service\tests\ExampleTest.php:86
C:\xampp\php\pear\PHPUnit\TextUI\Command.php:176
C:\xampp\php\pear\PHPUnit\TextUI\Command.php:129
FAILURES!
Tests: 7, Assertions: 43, Errors: 1.

I confess that this code is not originally mine - it is copied from a Laravel tutorial. It worked fine there. Unfortunately the answer to this related question did not help me either. Laravel 5.1 + PHPunit - API test returns always invalid argument error foreach

I tried to modify it in order to pass an json array as a parameter

public function testProductCreationFailsWhenNameNotProvided()
    {
        $product = factory(\App\Product::class)->make(['name' => '']);

        $this->post(route('api.products.store'), $product->jsonSerialize())
            ->seeJson(json_encode(array('name' => ['The name field is required.'])))
            ->assertResponseStatus(422);
    }

but then I got this error:

1) ExampleTest::testProductCreationFailsWhenNameNotProvided
TypeError: Argument 1 passed to Illuminate\Foundation\Testing\TestCase::seeJson() must be of the type array, string given, called in C:\xampp\htdocs\product-service\tests\ExampleTest.php on line 86

Did you change anything in your code based on the SO question you link to, because you're making the same mistake there that the poster of that question was making - passing an object rather than an array into seeJson(). — tex
Possible duplicate of Laravel 5.1 + PHPunit - API test returns always invalid argument error foreach — tex
yes, I actually tried various combinations like -seeJson(json_encode(array('name' => ['The name field is required.']))) and a lot more — Andrei
However, the official documentation says that the initial version was correct laravel.com/docs/5.1/testing#testing-json-apis — Andrei
Just remove the [] from 'The name field is required.' What response is the controller answering? — jackomo

Andrey Degtyaruk Andrey Degtyaruk · Accepted Answer · 2016-09-12T02:14:17

1) ExampleTest::testProductCreationFailsWhenNameNotProvided TypeError: Argument 1 passed to Illuminate\Foundation\Testing\TestCase::seeJson() must be of the type array, string given, called in C:\xampp\htdocs\product-service\tests\ExampleTest.php on line 86

This error tells you that you passed wrong type here:

->seeJson(json_encode(array('name' => ['The name field is required.'])))

You have to change it to look like this and it should work then.

->seeJson(array('name' => ['The name field is required.']))

Laravel 5.2 - Invalid argument supplied for foreach() - using phpunit

1 Answers