public function testGroups()
{
$defaultGroup = ['_id' => '$ts', 'totalCount' => ['$sum' => '$count.100']];
$pipeline = $this->instance->getPipeline();
$this->assertSame($defaultGroup, $pipeline[2]['$group']);
$this->instance->groupByDimensionName();
$pipeline = $this->instance->getPipeline();
$defaultGroup['_id'] = '$name';
$this->assertSame($defaultGroup, $pipeline[2]['$group']);
$this->instance->groupByDimensionValue();
$pipeline = $this->instance->getPipeline();
$defaultGroup['_id'] = ['name' => '$name', 'value' => '$value'];
$this->assertSame($defaultGroup, $pipeline[2]['$group']);
$this->instance->groupByEntityName();
$pipeline = $this->instance->getPipeline();
$defaultGroup['_id'] = '$entity';
$this->assertSame($defaultGroup, $pipeline[2]['$group']);
}
