Sokil\Mongo\AggregatePipelinesTest::testPipeline_MatchExpression PHP Method

    public function testPipeline_MatchExpression()
    {
        $pipeline = new Pipeline($this->collection);
        $expression = new Expression();
        $expression->where('a', 1)->whereLess('b', 12);
        $pipeline->match($expression);
        $this->assertEquals('[{"$match":{"a":1,"b":{"$lt":12}}}]', (string) $pipeline);
    }