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cat: check if the input file is also the output file

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This commit is contained in:
Michael Debertol 2021-08-08 00:48:37 +02:00
parent d967a7a553
commit 03ceb6750e
4 changed files with 87 additions and 6 deletions
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47
tests/by-util/test_cat.rs
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@ -1,5 +1,4 @@
use crate::common::util::*;
#[cfg(unix)]
use std::fs::OpenOptions;
#[cfg(unix)]
use std::io::Read;
@ -443,3 +442,49 @@ fn test_domain_socket() {
thread.join().unwrap();
}
#[test]
fn test_write_to_self_empty() {
// it's ok if the input file is also the output file if it's empty
let s = TestScenario::new(util_name!());
let file_path = s.fixtures.plus("file.txt");
let file = OpenOptions::new()
.create_new(true)
.write(true)
.append(true)
.open(&file_path)
.unwrap();
s.ucmd().set_stdout(file).arg(&file_path).succeeds();
}
#[test]
fn test_write_to_self() {
let s = TestScenario::new(util_name!());
let file_path = s.fixtures.plus("first_file");
s.fixtures.write("second_file", "second_file_content.");
let file = OpenOptions::new()
.create_new(true)
.write(true)
.append(true)
.open(&file_path)
.unwrap();
s.fixtures.append("first_file", "first_file_content.");
s.ucmd()
.set_stdout(file)
.arg("first_file")
.arg("first_file")
.arg("second_file")
.fails()
.code_is(2)
.stderr_only("cat: first_file: input file is output file\ncat: first_file: input file is output file");
assert_eq!(
s.fixtures.read("first_file"),
"first_file_content.second_file_content."
);
}