PhlyTest\Http\MessageTraitTest::testHeaderRemovalIsCaseInsensitive PHP Method

    public function testHeaderRemovalIsCaseInsensitive()
    {
        $message = $this->message->withHeader('X-Foo', 'Foo')->withAddedHeader('x-foo', 'Bar')->withAddedHeader('X-FOO', 'Baz');
        $this->assertNotSame($this->message, $message);
        $this->assertTrue($message->hasHeader('x-foo'));
        $message2 = $message->withoutHeader('x-foo');
        $this->assertNotSame($this->message, $message2);
        $this->assertNotSame($message, $message2);
        $this->assertFalse($message2->hasHeader('X-Foo'));
        $headers = $message2->getHeaders();
        $this->assertEquals(0, count($headers));
    }