Fix deprecated tests in PHP 8.5.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Tests pass?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.14%. Comparing base (ec017ea) to head (602eec1).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #256   +/-   ##
=========================================
  Coverage     98.14%   98.14%           
  Complexity      268      268           
=========================================
  Files            16       16           
  Lines           756      756           
=========================================
  Hits            742      742           
  Misses           14       14           

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[Copilot]

Pull request overview

This PR updates the test suite to avoid PHP 8.5-related deprecations/compatibility issues so the extension’s CI can run cleanly on newer PHP versions.

Changes:

• Adjusted the test helper invoke() implementation in tests/TestCase.php.
• Updated MessageTest::testHasCookies() to construct a Cookie with an explicit name.
• Added a changelog entry for the fix.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/TestCase.php	Alters the reflection-based helper used by many tests to call non-public methods.
tests/MessageTest.php	Updates cookie creation in a test to match newer expectations.
CHANGELOG.md	Records the test fixes in the project changelog.

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