PHPUnit 12 has removed deprecated methods like willReturnCallback() and changed how some mock behaviors are defined. Here’s how to rewrite your PHPUnit 12 test code in a compatible way:

⸻

✅ Original snippet (pre PHPUnit 12)

$redis = $this->createMock(RedisClient::class);
$redis->expects($this->exactly(3))
      ->method('callAsync')
      ->willReturnOnConsecutiveCalls(
          resolve(['{}']),
          $this->returnCallback(function (string $command, string $name, string $json) {
              $this->assertEquals('ZREM', $command);
              return resolve(1);
          }),
          resolve(0)
      );


⸻

✅ Updated for PHPUnit 12

Since returnCallback() is removed, you need to use ReturnCallback from PHPUnit’s newer stubbing system:

use PHPUnit\Framework\MockObject\Stub\ReturnCallback;

$redis = $this->createMock(RedisClient::class);

$stub = new ReturnCallback(function () {
    // You can vary return values based on the call count
    static $calls = 0;
    $calls++;

    if ($calls === 1) {
        return resolve(['{}']);
    }

    if ($calls === 2) {
        // You can't use $this directly in a static function,
        // so extract assertions outside or inject via closure
        return resolve(1); // maybe add custom checks elsewhere
    }

    return resolve(0);
});

$redis->expects($this->exactly(3))
      ->method('callAsync')
      ->will($stub);


⸻

🔁 Alternative with injected $this

If you need assertions inside the callback, you can capture $this:

$self = $this;

$redis = $this->createMock(RedisClient::class);

$redis->expects($this->exactly(3))
      ->method('callAsync')
      ->will(new ReturnCallback(function (...$args) use ($self) {
          static $i = 0;
          $i++;

          if ($i === 1) {
              return resolve(['{}']);
          }

          if ($i === 2) {
              [$command, $name, $json] = $args;
              $self->assertEquals('ZREM', $command);
              return resolve(1);
          }

          return resolve(0);
      }));


⸻

✅ Summary of changes for PHPUnit 12:

Feature	Old	New (PHPUnit 10+)
Callback return	$this->returnCallback()	new ReturnCallback()
Consecutive calls	willReturnOnConsecutiveCalls()	Use logic inside ReturnCallback
Assertions inside stub	Inline	Capture $this via closure

Would you like help refactoring your test to avoid mocks altogether or to test async logic more robustly?