diff --git a/tests/by-util/test_factor.rs b/tests/by-util/test_factor.rs
index fac175fa0..04f7a5273 100644
--- a/tests/by-util/test_factor.rs
+++ b/tests/by-util/test_factor.rs
@@ -72,8 +72,12 @@ fn test_random() {
     run(instring.as_bytes(), outstring.as_bytes());
 }
 
+// FixME: random failures; avoid for CI until fixed; ref: GH:uutils/coreutils#1531
 #[test]
 fn test_random_big() {
+    if is_ci() {
+        return;
+    }; // skip test under CI until random failures are fixed
     let mut rng = SmallRng::from_entropy();
     let bitrange_1 = Uniform::new(14usize, 51);
     let mut rand_64 = move || {
diff --git a/tests/by-util/test_hostname.rs b/tests/by-util/test_hostname.rs
index c5ffc5ff1..a526ddd88 100644
--- a/tests/by-util/test_hostname.rs
+++ b/tests/by-util/test_hostname.rs
@@ -10,9 +10,13 @@ fn test_hostname() {
     assert!(ls_default_res.stdout.len() >= ls_domain_res.stdout.len());
 }
 
+// FixME: fails for "MacOS"
+#[cfg(not(target_os = "macos"))]
 #[test]
 fn test_hostname_ip() {
-    let result = new_ucmd!().arg("-i").succeeds();
+    let result = new_ucmd!().arg("-i").run();
+    println!("{:#?}", result);
+    assert!(result.success);
     assert!(!result.stdout.trim().is_empty());
 }
 
diff --git a/tests/by-util/test_logname.rs b/tests/by-util/test_logname.rs
index 8dea3ee8b..b15941c06 100644
--- a/tests/by-util/test_logname.rs
+++ b/tests/by-util/test_logname.rs
@@ -13,7 +13,8 @@ fn test_normal() {
     for (key, value) in env::vars() {
         println!("{}: {}", key, value);
     }
-    if is_ci() && result.stderr.contains("error: no login name") {
+    if (is_ci() || is_wsl()) && result.stderr.contains("error: no login name") {
+        // ToDO: investigate WSL failure
         // In the CI, some server are failing to return logname.
         // As seems to be a configuration issue, ignoring it
         return;
diff --git a/tests/common/util.rs b/tests/common/util.rs
index 6585ddd96..b581b8de9 100644
--- a/tests/common/util.rs
+++ b/tests/common/util.rs
@@ -68,6 +68,7 @@ pub fn repeat_str(s: &str, n: u32) -> String {
 
 /// A command result is the outputs of a command (streams and status code)
 /// within a struct which has convenience assertion functions about those outputs
+#[derive(Debug)]
 pub struct CmdResult {
     //tmpd is used for convenience functions for asserts against fixtures
     tmpd: Option<Rc<TempDir>>,