public function testHeaderParseAndGet()
{
$request = new Request();
$request->setEnvironmentData(['REQUEST_METHOD' => 'POST', 'HTTP_FAKE_ASS_HEADER' => 'testing One TWO Three ', 'HTTP_X_FORWARDED_FOR' => '127.0.0.1']);
$expectedHeaders = ['Fake-Ass-Header' => 'testing One TWO Three ', 'X-Forwarded-For' => '127.0.0.1'];
$this->assertEquals($expectedHeaders, $request->getHeaders(), 'Headers should be parsed correctly, and their casings modified appropriately. Values should not change.');
$this->assertEquals(null, $request->getHeader('Request-Method', null, 'Only HTTP_ prefixed $_SERVER data should be considered a header'));
$this->assertEquals($expectedHeaders['X-Forwarded-For'], $request->getHeader('X-Forwarded-For'));
$this->assertEquals($expectedHeaders['Fake-Ass-Header'], $request->getHeader('Fake-Ass-Header'));
$this->assertEquals($expectedHeaders['X-Forwarded-For'], $request->getHeader('x-forwarded-for', 'getHeader() should be case insensitive'));
}