Maintenance – add ZAMMAD_PHP_API_CLIENT_UNIT_TESTS_TIMEOUT env

[derpixler]

What

Configurable request timeout for tests, Connection: close header to prevent Keep-Alive hangs, and connection_options support in the HTTP client.

Changes

src/HTTPClient.php

• New connection_options key to pass arbitrary Guzzle options (headers, curl, etc.) through to the Guzzle client.
  test/.../AbstractBaseTest.php
• ZAMMAD_PHP_API_CLIENT_UNIT_TESTS_TIMEOUT — optional env variable, overrides request timeout (default: 30s).
• connection_options with Connection: close — prevents HTTP connection reuse that hangs against local Zammad instances.

README.md

• New ### Running tests section documenting all test env variables with a table and usage example.
  phpunit.xml.dist
• Added ZAMMAD_PHP_API_CLIENT_UNIT_TESTS_TIMEOUT to the documented env variables.

How to test

Set env variables for a running Zammad instance, then:
ZAMMAD_PHP_API_CLIENT_UNIT_TESTS_TIMEOUT=120 vendor/bin/phpunit