public function testWrite()
{
$value = get_test_string();
$value_size = strlen($value);
$value_stream = string_to_stream($value);
$stream = string_to_stream("");
$buffer_size = 1000;
$writer = new StreamWriter($value_stream, $stream, $buffer_size);
$this->assertSame(0, ftell($value_stream));
$this->assertSame(0, ftell($stream));
$iterations = 0;
$bytes = 0;
while ($ret = $writer->write(false)) {
$bytes += $ret;
$iterations++;
}
// All the bytes were read from the source
$this->assertSame($value_size, ftell($value_stream));
// All the bytes were written to the dest
$this->assertSame($value_size, ftell($stream));
// All the bytes were reported by write()
$this->assertSame($value_size, $bytes);
// All the bytes were reported by getBytes()
$this->assertSame($value_size, $writer->getBytes());
// Read the data that was written to the stream back
// to the buffer so we can inspect it
rewind($stream);
stream_set_blocking($stream, true);
$buffer = stream_get_contents($stream);
// Make sure the data is copied to the buffer and is identical
$this->assertSame(md5($value), md5($buffer), "I/O itegrity check failed");
$min_iterations = ceil($value_size / $buffer_size);
$this->assertGreaterThanOrEqual($min_iterations, $iterations, "Finished reading the stream in {$iterations} iterations, but with a buffer_size of {$buffer_size} and {$value_size} bytes of data, it must have taken at least {$min_iterations} iterations");
}
