public function testProxiedExprMethods($method, array $args = [])
{
$expr = $this->getMockAggregationExpr();
$expr->expects($this->once())->method($method)->with(...$args);
$stage = $this->getStubStage();
$stage->setQuery($expr);
$this->assertSame($stage, $stage->{$method}(...$args));
}