Type Inference Issue with Named Parameters in PHPUnit Assertions Leading to Mixed Type Error in PHPStan

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php
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devtools, testing

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Start by reproducing the PHPStan error with the shown request data and PHPUnit assertions, comparing the positional and named-parameter forms of assertIsString. Trace how the assertion affects the inferred type of $data['result']['data']['id']; done means the named-parameter form preserves a string type for Uuid::fromString() without the mixed-type error.

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描述

Hello,

I've encountered a type inference issue when using PHPStan with PHPUnit assertions on a piece of code that utilizes named parameters.

Given the following code snippet:

$data = $this->requestAndGetData(method: 'segment.create', parameters: [ 'name' => 'Test segment' ]);

self::assertArrayHasKey(key: 'id', array: $data['result']['data']);
self::assertIsString($data['result']['data']['id']);

$segmentId = $data['result']['data']['id'];
$segmentUuid = Symfony\Component\Uid\Uuid::fromString(uuid: $segmentId);

The package operates correctly, and I am confident that the $segmentId variable is a string. However, after modifying the assertIsString assertion to use a named parameter:

self::assertIsString(actual: $data['result']['data']['id']);

I start receiving the following error from PHPStan:

Parameter $uuid of static method Symfony\Component\Uid\Uuid::fromString() expects string, mixed given.

This issue does not occur when the named parameter is not used in the assertion.

Thank you for your time and assistance.

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