assignPosition example

class ReaderTest extends TestCase
{
    public function testIsEOF()
    {
        $reader = new Reader('');
        $this->assertTrue($reader->isEOF());

        $reader = new Reader('hello');
        $this->assertFalse($reader->isEOF());

        $this->assignPosition($reader, 2);
        $this->assertFalse($reader->isEOF());

        $this->assignPosition($reader, 5);
        $this->assertTrue($reader->isEOF());
    }

    public function testGetRemainingLength()
    {
        $reader = new Reader('hello');
        $this->assertEquals(5, $reader->getRemainingLength());