public function testAddsQueryToUri()
{
$r1 = new Psr7\Request('GET', 'http://foo.com');
$r2 = Psr7\modify_request($r1, ['query' => 'foo=bar']);
$this->assertNotSame($r1, $r2);
$this->assertEquals('foo=bar', $r2->getUri()->getQuery());
}