From d15e762a9032dcf246cf14c1bb5d35edca5b520d Mon Sep 17 00:00:00 2001
From: Christopher Dryden <christopher.paul.dryden@gmail.com>
Date: Thu, 12 Feb 2026 12:01:05 +0000
Subject: [PATCH] date,comm,tty: add integration tests for write error handling

---
 tests/by-util/test_comm.rs | 15 +++++++++++++++
 tests/by-util/test_date.rs | 12 ++++++++++++
 tests/by-util/test_tty.rs  |  8 ++++++++
 3 files changed, 35 insertions(+)

diff --git a/tests/by-util/test_comm.rs b/tests/by-util/test_comm.rs
index e314cfaf1..500899a20 100644
--- a/tests/by-util/test_comm.rs
+++ b/tests/by-util/test_comm.rs
@@ -727,3 +727,18 @@ fn test_read_error() {
         .fails()
         .stderr_contains("comm: /proc/self/mem: Input/output error");
 }
+
+#[test]
+#[cfg(unix)]
+fn test_comm_write_error_dev_full() {
+    use std::fs::OpenOptions;
+    let scene = TestScenario::new(util_name!());
+    scene.fixtures.write("a", "a\n");
+    let dev_full = OpenOptions::new().write(true).open("/dev/full").unwrap();
+    scene
+        .ucmd()
+        .args(&["a", "a"])
+        .set_stdout(dev_full)
+        .fails()
+        .stderr_contains("No space left on device");
+}
diff --git a/tests/by-util/test_date.rs b/tests/by-util/test_date.rs
index 7a5625a01..11d42b9c5 100644
--- a/tests/by-util/test_date.rs
+++ b/tests/by-util/test_date.rs
@@ -2066,3 +2066,15 @@ fn test_percent_percent_not_replaced() {
             .stdout_is(expected);
     }
 }
+
+#[test]
+#[cfg(unix)]
+fn test_date_write_error_dev_full() {
+    use std::fs::OpenOptions;
+    let dev_full = OpenOptions::new().write(true).open("/dev/full").unwrap();
+    new_ucmd!()
+        .arg("+%s")
+        .set_stdout(dev_full)
+        .fails()
+        .stderr_contains("write error");
+}
diff --git a/tests/by-util/test_tty.rs b/tests/by-util/test_tty.rs
index 9e1db7a21..b5aa23aa7 100644
--- a/tests/by-util/test_tty.rs
+++ b/tests/by-util/test_tty.rs
@@ -87,3 +87,11 @@ fn test_stdout_fail() {
     let status = proc.wait().unwrap();
     assert_eq!(status.code(), Some(3));
 }
+
+#[test]
+#[cfg(unix)]
+fn test_version_pipe_no_stderr() {
+    let mut child = new_ucmd!().arg("--version").run_no_wait();
+    child.close_stdout();
+    child.wait().unwrap().no_stderr();
+}