public function testSkipsOverwrittenBytes()
{
$decorated = Psr7\stream_for(implode("\n", array_map(function ($n) {
return str_pad($n, 4, '0', STR_PAD_LEFT);
}, range(0, 25))));
$body = new CachingStream($decorated);
$this->assertEquals("0000\n", Psr7\readline($body));
$this->assertEquals("0001\n", Psr7\readline($body));
// Write over part of the body yet to be read, so skip some bytes
$this->assertEquals(5, $body->write("TEST\n"));
$this->assertEquals(5, $this->readAttribute($body, 'skipReadBytes'));
// Read, which skips bytes, then reads
$this->assertEquals("0003\n", Psr7\readline($body));
$this->assertEquals(0, $this->readAttribute($body, 'skipReadBytes'));
$this->assertEquals("0004\n", Psr7\readline($body));
$this->assertEquals("0005\n", Psr7\readline($body));
// Overwrite part of the cached body (so don't skip any bytes)
$body->seek(5);
$this->assertEquals(5, $body->write("ABCD\n"));
$this->assertEquals(0, $this->readAttribute($body, 'skipReadBytes'));
$this->assertEquals("TEST\n", Psr7\readline($body));
$this->assertEquals("0003\n", Psr7\readline($body));
$this->assertEquals("0004\n", Psr7\readline($body));
$this->assertEquals("0005\n", Psr7\readline($body));
$this->assertEquals("0006\n", Psr7\readline($body));
$this->assertEquals(5, $body->write("1234\n"));
$this->assertEquals(5, $this->readAttribute($body, 'skipReadBytes'));
// Seek to 0 and ensure the overwritten bit is replaced
$body->seek(0);
$this->assertEquals("0000\nABCD\nTEST\n0003\n0004\n0005\n0006\n1234\n0008\n0009\n", $body->read(50));
// Ensure that casting it to a string does not include the bit that was overwritten
$this->assertContains("0000\nABCD\nTEST\n0003\n0004\n0005\n0006\n1234\n0008\n0009\n", (string) $body);
}