    public function testAggregatesHeaders()
    {
        $r = new Request('GET', '', [
            'ZOO' => 'zoobar',
            'zoo' => ['foobar', 'zoobar']
        ]);
        $this->assertEquals(['ZOO' => ['zoobar', 'foobar', 'zoobar']], $r->getHeaders());
        $this->assertEquals('zoobar, foobar, zoobar', $r->getHeaderLine('zoo'));
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.