GuzzleHttp\Tests\Psr7\UriTest::testSchemeIsNormalizedToLowercase PHP Method

    public function testSchemeIsNormalizedToLowercase()
    {
        $uri = new Uri('HTTP://example.com');
        $this->assertSame('http', $uri->getScheme());
        $this->assertSame('http://example.com', (string) $uri);
        $uri = (new Uri('//example.com'))->withScheme('HTTP');
        $this->assertSame('http', $uri->getScheme());
        $this->assertSame('http://example.com', (string) $uri);
    }