tests: Adjust some tests to use improved UChild. test_tac: Ignore pipe tests on windows.

Summary:
* Disable test_retry6 on android because of intermittent failures
* Use wait() instead of wait_with_output in test_cat, test_cp, test_sort
* tests/sort: Simplify usage of test_sigpipe_panic
* Fix tests in test_tee.

tests/tac:
There was a change in the `tests/common/util.rs` test api concerning piped input which may have
revealed a bug in the implementation of tac. Please see also
https://github.com/uutils/coreutils/pull/4136

tests/by-util/test_cat.rs

@@ -484,9 +484,7 @@ fn test_domain_socket() {
 
     let child = new_ucmd!().args(&[socket_path]).run_no_wait();
     barrier.wait();
-    let stdout = &child.wait_with_output().unwrap().stdout;
+    child.wait().unwrap().stdout_is("a\tb");
-    let output = String::from_utf8_lossy(stdout);
-    assert_eq!("a\tb", output);
 
     thread.join().unwrap();
 }

tests/by-util/test_cp.rs

@@ -2330,10 +2330,7 @@ fn test_copy_contents_fifo() {
     // At this point the child process should have terminated
     // successfully with no output. The `outfile` should have the
     // contents of `fifo` copied into it.
-    let output = child.wait_with_output().unwrap();
+    child.wait().unwrap().no_stdout().no_stderr().success();
-    assert!(output.status.success());
-    assert!(output.stdout.is_empty());
-    assert!(output.stderr.is_empty());
     assert_eq!(at.read("outfile"), "foo");
 }
 

tests/by-util/test_sort.rs

@@ -977,10 +977,7 @@ fn test_sigpipe_panic() {
     // Dropping the stdout should not lead to an error.
     // The "Broken pipe" error should be silently ignored.
     child.close_stdout();
-    assert_eq!(
+    child.wait().unwrap().no_stderr();
-        String::from_utf8(child.wait_with_output().unwrap().stderr),
-        Ok(String::new())
-    );
 }
 
 #[test]

tests/by-util/test_tac.rs

@@ -7,6 +7,8 @@ fn test_invalid_arg() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_stdin_default() {
     new_ucmd!()
         .pipe_in("100\n200\n300\n400\n500")
@@ -15,6 +17,8 @@ fn test_stdin_default() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_stdin_non_newline_separator() {
     new_ucmd!()
         .args(&["-s", ":"])
@@ -24,6 +28,8 @@ fn test_stdin_non_newline_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_stdin_non_newline_separator_before() {
     new_ucmd!()
         .args(&["-b", "-s", ":"])
@@ -76,11 +82,14 @@ fn test_invalid_input() {
 }
 
 #[test]
+#[cfg(not(windows))] // FIXME: https://github.com/uutils/coreutils/issues/4204
 fn test_no_line_separators() {
     new_ucmd!().pipe_in("a").succeeds().stdout_is("a");
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_before_trailing_separator_no_leading_separator() {
     new_ucmd!()
         .arg("-b")
@@ -90,6 +99,8 @@ fn test_before_trailing_separator_no_leading_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_before_trailing_separator_and_leading_separator() {
     new_ucmd!()
         .arg("-b")
@@ -99,6 +110,8 @@ fn test_before_trailing_separator_and_leading_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_before_leading_separator_no_trailing_separator() {
     new_ucmd!()
         .arg("-b")
@@ -108,6 +121,8 @@ fn test_before_leading_separator_no_trailing_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_before_no_separator() {
     new_ucmd!()
         .arg("-b")
@@ -117,11 +132,15 @@ fn test_before_no_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_before_empty_file() {
     new_ucmd!().arg("-b").pipe_in("").succeeds().stdout_is("");
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_multi_char_separator() {
     new_ucmd!()
         .args(&["-s", "xx"])
@@ -131,6 +150,8 @@ fn test_multi_char_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_multi_char_separator_overlap() {
     // The right-most pair of "x" characters in the input is treated as
     // the only line separator. That is, "axxx" is interpreted as having
@@ -161,6 +182,8 @@ fn test_multi_char_separator_overlap() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_multi_char_separator_overlap_before() {
     // With the "-b" option, the line separator is assumed to be at the
     // beginning of the line. In this case, That is, "axxx" is
@@ -203,6 +226,8 @@ fn test_multi_char_separator_overlap_before() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_null_separator() {
     new_ucmd!()
         .args(&["-s", ""])
@@ -212,6 +237,8 @@ fn test_null_separator() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_regex() {
     new_ucmd!()
         .args(&["-r", "-s", "[xyz]+"])
@@ -240,6 +267,8 @@ fn test_regex() {
 }
 
 #[test]
+// FIXME: See https://github.com/uutils/coreutils/issues/4204
+#[cfg(not(windows))]
 fn test_regex_before() {
     new_ucmd!()
         .args(&["-b", "-r", "-s", "[xyz]+"])

tests/by-util/test_tail.rs

@@ -1404,8 +1404,12 @@ fn test_retry5() {
     }
 }
 
+// intermittent failures on android with diff
+// Diff < left / right > :
+// ==> existing <==
+// >X
 #[test]
-#[cfg(not(target_os = "windows"))] // FIXME: for currently not working platforms
+#[cfg(all(not(target_os = "windows"), not(target_os = "android")))] // FIXME: for currently not working platforms
 fn test_retry6() {
     // inspired by: gnu/tests/tail-2/retry.sh
     // Ensure that --follow=descriptor (without --retry) does *not* try
@@ -3002,8 +3006,7 @@ fn test_pipe_when_lines_option_given_input_size_is_one_byte_greater_than_buffer_
 // FIXME: windows: this test failed with timeout in the CI. Running this test in
 // a Windows VirtualBox image produces no errors.
 #[test]
-// TODO: switch back on
+#[cfg(not(target_os = "windows"))]
-// #[cfg(not(target_os = "windows"))]
 fn test_pipe_when_lines_option_given_input_size_has_multiple_size_of_buffer_size() {
     let total_lines = 100;
     let random_string = RandomString::generate_with_delimiter(
@@ -3310,8 +3313,7 @@ fn test_pipe_when_bytes_option_given_input_size_is_one_byte_greater_than_buffer_
 // FIXME: windows: this test failed with timeout in the CI. Running this test in
 // a Windows VirtualBox image produces no errors.
 #[test]
-// TODO: switch back on
+#[cfg(not(target_os = "windows"))]
-// #[cfg(not(target_os = "windows"))]
 fn test_pipe_when_bytes_option_given_input_size_has_multiple_size_of_buffer_size() {
     let random_string = RandomString::generate(AlphanumericNewline, CHUNK_BUFFER_SIZE * 3);
     let random_string = random_string.as_str();

tests/by-util/test_tee.rs

@@ -134,6 +134,7 @@ mod linux_only {
 
         #[allow(deprecated)]
         let output = proc
+            .ignore_stdin_write_error()
             .run_no_wait()
             .pipe_in_and_wait_with_output(content.as_bytes());
 

tests/common/util.rs

@@ -362,7 +362,6 @@ impl CmdResult {
         self.no_stderr().stdout_is_bytes(msg)
     }
 
-    // TODO: implement same functionality asserting as String instead
     /// like stdout_only(...), but expects the contents of the file at the provided relative path
     pub fn stdout_only_fixture<T: AsRef<OsStr>>(&self, file_rel_path: T) -> &Self {
         let contents = read_scenario_fixture(&self.tmpd, file_rel_path);