Better way for testing validation errors

I'm testing a form where user must introduce some text between let's say 100 and 500 characters.

I tried to emulate the user input:

$this->actingAs($user)
->visit('myweb/create')
->type($this->faker->text(1000),'description')
->press('Save')
->see('greater than');

Here I'm looking for the greathr than piece of text in the response... It depends on the translation specified for that validation error.

How could do the same test without having to depend on the text of the validation error and do it depending only on the error itself?