public function testSetHeadersOverwritesAllHeaders()
{
$h = new Request('GET', 'http://foo.com');
$h->setHeader('foo', 'bar');
$h->setHeaders(['foo' => 'a', 'boo' => 'b']);
$this->assertEquals(['foo' => ['a'], 'boo' => ['b']], $h->getHeaders());
}
