coreutils/tests/test_truncate.rs
Nathan Ross 99b39e4237 tests: normalize around chaining asserts
Although for some tests this adds characters
we still use them there because the
brevity cost is now worth the benefit in
terms of instant, natural-language readability
and recognizability for people not familiar
with this tests of this module or even the project
2016-08-13 17:59:21 -04:00

32 lines
942 B
Rust

use common::util::*;
use std::io::{Seek, SeekFrom, Write};
static UTIL_NAME: &'static str = "truncate";
fn at_and_ucmd() -> (AtPath, UCommand) {
let ts = TestScenario::new(UTIL_NAME);
let ucmd = ts.ucmd();
(ts.fixtures, ucmd)
}
static TFILE1: &'static str = "truncate_test_1";
static TFILE2: &'static str = "truncate_test_2";
#[test]
fn test_increase_file_size() {
let (at, mut ucmd) = at_and_ucmd();
let mut file = at.make_file(TFILE1);
ucmd.args(&["-s", "+5K", TFILE1]).succeeds();
file.seek(SeekFrom::End(0)).unwrap();
assert!(file.seek(SeekFrom::Current(0)).unwrap() == 5 * 1024);
}
#[test]
fn test_decrease_file_size() {
let (at, mut ucmd) = at_and_ucmd();
let mut file = at.make_file(TFILE2);
file.write_all(b"1234567890").unwrap();
ucmd.args(&["--size=-4", TFILE2]).succeeds();
file.seek(SeekFrom::End(0)).unwrap();
assert!(file.seek(SeekFrom::Current(0)).unwrap() == 6);
}