no executable "echo" on windows

tests/by-util/test_env.rs

@@ -272,19 +272,20 @@ fn modify_newlines_according_platform(input: &str) -> String {
     }
 }
 
+#[cfg(not(target_os = "windows"))] // windows has no executable "echo", its only supported as part of a batch-file
 #[test]
 fn test_split_string_into_args_one_argument_no_quotes() {
     let scene = TestScenario::new(util_name!());
 
     let out = scene
         .ucmd()
-        .arg("-S echo hello world") // this is the only case where the "echo" from windows behaves like the echo from unix
+        .arg("-S echo hello world")
         .succeeds()
         .stdout_move_str();
     assert_eq!(out, modify_newlines_according_platform("hello world\n"));
 }
 
-#[cfg(not(target_os = "windows"))] // differences in behavior of "echo"
+#[cfg(not(target_os = "windows"))] // windows has no executable "echo", its only supported as part of a batch-file
 #[test]
 fn test_split_string_into_args_one_argument() {
     let scene = TestScenario::new(util_name!());
@@ -297,7 +298,7 @@ fn test_split_string_into_args_one_argument() {
     assert_eq!(out, modify_newlines_according_platform("hello world\n"));
 }
 
-#[cfg(not(target_os = "windows"))] // differences in behavior of "echo"
+#[cfg(not(target_os = "windows"))] // windows has no executable "echo", its only supported as part of a batch-file
 #[test]
 fn test_split_string_into_args_s_escaping_challenge() {
     let scene = TestScenario::new(util_name!());