    public function testExtendingClassesInstantiates()
    {
        // The non-standard port triggers a cascade of private methods which
        //  should not use late static binding to access private static members.
        // If they do, this will fatal.
        $this->assertInstanceOf(
            '\GuzzleHttp\Tests\Psr7\ExtendingClassTest',
            new ExtendingClassTest('http://h:9/')
        );
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.