Doctrine\MongoDB\Tests\Aggregation\Stage\ProjectTest::testProjectStage PHP Method

    public function testProjectStage()
    {
        $projectStage = new Project($this->getTestAggregationBuilder());
        $projectStage->excludeIdField()->includeFields(['$field', '$otherField'])->field('product')->multiply('$field', 5);
        $this->assertSame(['$project' => ['_id' => false, '$field' => true, '$otherField' => true, 'product' => ['$multiply' => ['$field', 5]]]], $projectStage->getExpression());
    }