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tests/tail: Add a test for tail'ing large files in bytes mode

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This commit is contained in:
Nick Fitzgerald 2016-03-27 14:33:55 -07:00
parent 1be7d31d5a
commit 0bc05e2dcf
1 changed files with 32 additions and 0 deletions
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32
tests/tail.rs
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@ -61,3 +61,35 @@ fn test_bytes_stdin() {
let result = ucmd.arg("-c").arg("13").run_piped_stdin(at.read(INPUT));
assert_eq!(result.stdout, at.read("foobar_bytes_stdin.expected"));
}
#[test]
fn test_bytes_big() {
const FILE: &'static str = "test_bytes_big.txt";
const EXPECTED_FILE: &'static str = "test_bytes_big_expected.txt";
const BYTES: usize = 1_000_000;
const N_ARG: usize = 100_000;
let (at, mut ucmd) = testing(UTIL_NAME);
let mut big_input = at.make_scoped_file(FILE);
for i in 0..BYTES {
let digit = std::char::from_digit((i % 10) as u32, 10).unwrap();
write!(&mut big_input, "{}", digit).expect("Could not write to FILE");
}
big_input.flush().expect("Could not flush FILE");
let mut big_expected = at.make_scoped_file(EXPECTED_FILE);
for i in (BYTES - N_ARG)..BYTES {
let digit = std::char::from_digit((i % 10) as u32, 10).unwrap();
write!(&mut big_expected, "{}", digit).expect("Could not write to EXPECTED_FILE");
}
big_expected.flush().expect("Could not flush EXPECTED_FILE");
let result = ucmd.arg(FILE).arg("-c").arg(format!("{}", N_ARG)).run().stdout;
let expected = at.read(EXPECTED_FILE);
assert_eq!(result.len(), expected.len());
for (actual_char, expected_char) in result.chars().zip(expected.chars()) {
assert_eq!(actual_char, expected_char);
}
}