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fix(tail): add support for negative indexing (#1865)

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closes: https://github.com/uutils/coreutils/issues/1860
This commit is contained in:
Yagiz Degirmenci 2021-03-22 12:01:54 +03:00 • committed by GitHub
parent 21be280c5a
commit 27b7552ef4
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2 changed files with 18 additions and 2 deletions
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14
tests/by-util/test_tail.rs
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@ -329,3 +329,17 @@ fn test_multiple_input_quiet_flag_overrides_verbose_flag_for_suppressing_headers
.run()
.stdout_is_fixture("foobar_multiple_quiet.expected");
}
#[test]
fn test_negative_indexing() {
let positive_lines_index = new_ucmd!().arg("-n").arg("5").arg(FOOBAR_TXT).run();
let negative_lines_index = new_ucmd!().arg("-n").arg("-5").arg(FOOBAR_TXT).run();
let positive_bytes_index = new_ucmd!().arg("-c").arg("20").arg(FOOBAR_TXT).run();
let negative_bytes_index = new_ucmd!().arg("-c").arg("-20").arg(FOOBAR_TXT).run();
assert_eq!(positive_lines_index.stdout, negative_lines_index.stdout);
assert_eq!(positive_bytes_index.stdout, negative_bytes_index.stdout);
}