diff --git a/tests/by-util/test_cat.rs b/tests/by-util/test_cat.rs
index 560709f29..ab8e71899 100644
--- a/tests/by-util/test_cat.rs
+++ b/tests/by-util/test_cat.rs
@@ -175,6 +175,7 @@ fn test_piped_to_dev_full() {
             s.ucmd()
                 .set_stdout(dev_full)
                 .pipe_in_fixture("alpha.txt")
+                .ignore_stdin_write_error()
                 .fails()
                 .stderr_contains("No space left on device");
         }
@@ -224,6 +225,7 @@ fn test_three_directories_and_file_and_stdin() {
             "test_directory3",
         ])
         .pipe_in("stdout bytes")
+        .ignore_stdin_write_error()
         .fails()
         .stderr_is_fixture("three_directories_and_file_and_stdin.stderr.expected")
         .stdout_is(
diff --git a/tests/by-util/test_numfmt.rs b/tests/by-util/test_numfmt.rs
index 2c2e95d0b..bb80502d5 100644
--- a/tests/by-util/test_numfmt.rs
+++ b/tests/by-util/test_numfmt.rs
@@ -666,7 +666,12 @@ fn test_invalid_stdin_number_returns_status_2() {
 
 #[test]
 fn test_invalid_stdin_number_in_middle_of_input() {
-    new_ucmd!().pipe_in("100\nhello\n200").fails().code_is(2);
+    new_ucmd!()
+        .pipe_in("100\nhello\n200")
+        .ignore_stdin_write_error()
+        .fails()
+        .stdout_is("100\n")
+        .code_is(2);
 }
 
 #[test]
diff --git a/tests/by-util/test_sort.rs b/tests/by-util/test_sort.rs
index 97c72c7b1..8c2241e51 100644
--- a/tests/by-util/test_sort.rs
+++ b/tests/by-util/test_sort.rs
@@ -813,8 +813,6 @@ fn test_check_silent() {
 
 #[test]
 fn test_check_unique() {
-    // Due to a clap bug the combination "-cu" does not work. "-c -u" works.
-    // See https://github.com/clap-rs/clap/issues/2624
     new_ucmd!()
         .args(&["-c", "-u"])
         .pipe_in("A\nA\n")
@@ -823,6 +821,16 @@ fn test_check_unique() {
         .stderr_only("sort: -:2: disorder: A\n");
 }
 
+#[test]
+fn test_check_unique_combined() {
+    new_ucmd!()
+        .args(&["-cu"])
+        .pipe_in("A\nA\n")
+        .fails()
+        .code_is(1)
+        .stderr_only("sort: -:2: disorder: A\n");
+}
+
 #[test]
 fn test_dictionary_and_nonprinting_conflicts() {
     let conflicting_args = ["n", "h", "g", "M"];
diff --git a/tests/by-util/test_split.rs b/tests/by-util/test_split.rs
index acb8ab561..4e98a046a 100644
--- a/tests/by-util/test_split.rs
+++ b/tests/by-util/test_split.rs
@@ -1068,6 +1068,7 @@ fn test_split_number_oversized_stdin() {
     new_ucmd!()
         .args(&["--number=3", "---io-blksize=600"])
         .pipe_in_fixture("sixhundredfiftyonebytes.txt")
+        .ignore_stdin_write_error()
         .fails()
         .stderr_only("split: -: cannot determine input size\n");
 }
diff --git a/tests/by-util/test_tee.rs b/tests/by-util/test_tee.rs
index 34076bbf9..c18668278 100644
--- a/tests/by-util/test_tee.rs
+++ b/tests/by-util/test_tee.rs
@@ -77,7 +77,7 @@ fn test_tee_no_more_writeable_1() {
     // equals to 'tee /dev/full out2 <multi_read' call
     let (at, mut ucmd) = at_and_ucmd!();
     let content = (1..=10).fold(String::new(), |mut output, x| {
-        let _ = writeln!(output, "{x}");
+        writeln!(output, "{x}").unwrap();
         output
     });
     let file_out = "tee_file_out";