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Fixes assertSame()/assertEquals() serialization errors running in separate processes.

Important

sebastian/comparator 8.2.0 fixes this upstream, so this patch is only needed below that version. See sebastianbergmann/comparator#158: as of 8.2.0, ComparisonFailure implements __serialize()/__unserialize() and can be serialized across process-isolation boundaries even when its stack trace references non-serializable objects (e.g. a PDO passed as a method argument) — exactly the case this package works around. This package is therefore constrained to sebastian/comparator <8.2. On comparator >=8.2 you do not need it (and shouldn't install it: it would override the upstream-fixed class).

Requirements

php: >=5.3.3
phpunit/phpunit: >=4.8.0
sebastianbergmann/comparator: ^1.0 || ^2.0 || ^3.0 || ^4.0 || ^5.0 || ^6.0 || ^7.0 || >=8.0 <8.2

Installing

composer require --dev mpyw/phpunit-patch-serializable-comparison

Example

class AssertionTest extends TestCase
{
    protected function callAssertSameReceivingClosure(\Closure $closure)
    {
        static::assertSame('aaa', 'bbb');
    }

    #[RunInSeparateProcess]
    #[PreserveGlobalState(enabled: false)]
    public function testAssertionIncludingUnserializableTrace()
    {
        static::callAssertSameInClosure(function () {});
    }
}

Before Patching

PHPUnit\Framework\Exception: PHP Fatal error:  Uncaught Exception: Serialization of 'Closure' is not allowed in Standard input code:XX
Stack trace:
#0 Standard input code(XX): serialize(Array)
#1 Standard input code(XX): __phpunit_run_isolated_test()
#2 {main}
  thrown in Standard input code on line XX

After Patching

Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'aaa'
+'bbb'

mpyw / phpunit-patch-serializable-comparison

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