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|
/// test a few read scenarios
macro_rules! test_read {
($(#[$attr:meta])* $modname:ident ($input:expr, $len:expr)) => {
mod $modname {
use std::io::{Read, BufReader};
use paasio::*;
const CHUNK_SIZE: usize = 2;
$(#[$attr])*
#[test]
fn test_read_passthrough() {
let data = $input;
let size = $len(&data);
let mut reader = ReadStats::new(data);
let mut buffer = Vec::with_capacity(size);
let qty_read = reader.read_to_end(&mut buffer);
assert!(qty_read.is_ok());
assert_eq!(size, qty_read.unwrap());
assert_eq!(size, buffer.len());
// 2: first to read all the data, second to check that
// there wasn't any more pending data which simply didn't
// fit into the existing buffer
assert_eq!(2, reader.reads());
assert_eq!(size, reader.bytes_through());
}
$(#[$attr])*
#[test]
fn test_read_chunks() {
let data = $input;
let size = $len(&data);
let mut reader = ReadStats::new(data);
let mut buffer = [0_u8; CHUNK_SIZE];
let mut chunks_read = 0;
while reader.read(&mut buffer[..]).unwrap_or_else(|_| panic!("read failed at chunk {}", chunks_read+1)) > 0 {
chunks_read += 1;
}
assert_eq!(size / CHUNK_SIZE + std::cmp::min(1, size % CHUNK_SIZE), chunks_read);
// we read once more than the number of chunks, because the final
// read returns 0 new bytes
assert_eq!(1+chunks_read, reader.reads());
assert_eq!(size, reader.bytes_through());
}
$(#[$attr])*
#[test]
fn test_read_buffered_chunks() {
let data = $input;
let size = $len(&data);
let mut reader = BufReader::new(ReadStats::new(data));
let mut buffer = [0_u8; CHUNK_SIZE];
let mut chunks_read = 0;
while reader.read(&mut buffer[..]).unwrap_or_else(|_| panic!("read failed at chunk {}", chunks_read+1)) > 0 {
chunks_read += 1;
}
assert_eq!(size / CHUNK_SIZE + std::cmp::min(1, size % CHUNK_SIZE), chunks_read);
// the BufReader should smooth out the reads, collecting into
// a buffer and performing only two read operations:
// the first collects everything into the buffer,
// and the second ensures that no data remains
assert_eq!(2, reader.get_ref().reads());
assert_eq!(size, reader.get_ref().bytes_through());
}
}
};
}
/// test a few write scenarios
macro_rules! test_write {
($(#[$attr:meta])* $modname:ident ($input:expr, $len:expr)) => {
mod $modname {
use std::io::{self, Write, BufWriter};
use paasio::*;
const CHUNK_SIZE: usize = 2;
$(#[$attr])*
#[test]
fn test_write_passthrough() {
let data = $input;
let size = $len(&data);
let mut writer = WriteStats::new(Vec::with_capacity(size));
let written = writer.write(data);
assert!(written.is_ok());
assert_eq!(size, written.unwrap());
assert_eq!(size, writer.bytes_through());
assert_eq!(1, writer.writes());
assert_eq!(data, writer.get_ref().as_slice());
}
$(#[$attr])*
#[test]
fn test_sink_oneshot() {
let data = $input;
let size = $len(&data);
let mut writer = WriteStats::new(io::sink());
let written = writer.write(data);
assert!(written.is_ok());
assert_eq!(size, written.unwrap());
assert_eq!(size, writer.bytes_through());
assert_eq!(1, writer.writes());
}
$(#[$attr])*
#[test]
fn test_sink_windowed() {
let data = $input;
let size = $len(&data);
let mut writer = WriteStats::new(io::sink());
let mut chunk_count = 0;
for chunk in data.chunks(CHUNK_SIZE) {
chunk_count += 1;
let written = writer.write(chunk);
assert!(written.is_ok());
assert_eq!(CHUNK_SIZE, written.unwrap());
}
assert_eq!(size, writer.bytes_through());
assert_eq!(chunk_count, writer.writes());
}
$(#[$attr])*
#[test]
fn test_sink_buffered_windowed() {
let data = $input;
let size = $len(&data);
let mut writer = BufWriter::new(WriteStats::new(io::sink()));
for chunk in data.chunks(CHUNK_SIZE) {
let written = writer.write(chunk);
assert!(written.is_ok());
assert_eq!(CHUNK_SIZE, written.unwrap());
}
// at this point, nothing should have yet been passed through to
// our writer
assert_eq!(0, writer.get_ref().bytes_through());
assert_eq!(0, writer.get_ref().writes());
// after flushing, everything should pass through in one go
assert!(writer.flush().is_ok());
assert_eq!(size, writer.get_ref().bytes_through());
assert_eq!(1, writer.get_ref().writes());
}
}
};
}
#[test]
fn test_create_stats() {
let mut data: Vec<u8> = Vec::new();
let _ = paasio::ReadStats::new(data.as_slice());
let _ = paasio::WriteStats::new(data.as_mut_slice());
}
test_read!(read_string (
"Twas brillig, and the slithy toves/Did gyre and gimble in the wabe:/All mimsy were the borogoves,/And the mome raths outgrabe.".as_bytes(),
|d: &[u8]| d.len()
));
test_write!(write_string (
"Beware the Jabberwock, my son!/The jaws that bite, the claws that catch!/Beware the Jubjub bird, and shun/The frumious Bandersnatch!".as_bytes(),
|d: &[u8]| d.len()
));
test_read!(read_byte_literal(
&[1_u8, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144][..],
|d: &[u8]| d.len()
));
test_write!(write_byte_literal(
&[2_u8, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61,][..],
|d: &[u8]| d.len()
));
test_read!(read_file(
::std::fs::File::open("README.md").expect("readme must be present"),
|f: &::std::fs::File| f.metadata().expect("metadata must be present").len() as usize
));
#[test]
fn read_stats_by_ref_returns_wrapped_reader() {
use paasio::ReadStats;
let input =
"Why, sometimes I've believed as many as six impossible things before breakfast".as_bytes();
let reader = ReadStats::new(input);
assert_eq!(reader.get_ref(), &input);
}
|
