fix: handle AfterLastTestMethodErrored in StateGenerator to prevent TypeError in parallel mode

When running tests in parallel mode (--parallel), testErroredEvents() can
return AfterLastTestMethodErrored events. The existing code assumed all
non-Errored events were BeforeFirstTestMethodErrored, causing a TypeError
when an AfterLastTestMethodErrored event was passed to
fromBeforeFirstTestMethodErrored().

The fix adds an explicit instanceof check for
BeforeFirstTestMethodErrored instead of the catch-all else, allowing
AfterLastTestMethodErrored events to be safely skipped.

Fixes #1623

Author: YoussefMansour9

src/Support/StateGenerator.php

@@ -10,6 +10,7 @@
 use PHPUnit\Event\Code\TestDoxBuilder;
 use PHPUnit\Event\Code\TestMethod;
 use PHPUnit\Event\Code\ThrowableBuilder;
+use PHPUnit\Event\Test\BeforeFirstTestMethodErrored;
 use PHPUnit\Event\Test\Errored;
 use PHPUnit\Event\Test\Failed;
 use PHPUnit\Event\Test\PhpunitDeprecationTriggered;
@@ -34,8 +35,7 @@ public function fromPhpUnitTestResult(int $passedTests, PHPUnitTestResult $testR
                     TestResult::FAIL,
                     $testResultEvent->throwable()
                 ));
-            } else {
-                // @phpstan-ignore-next-line
+            } elseif ($testResultEvent instanceof BeforeFirstTestMethodErrored) {
                 $state->add(TestResult::fromBeforeFirstTestMethodErrored($testResultEvent));
             }
         }