Remove old pipefail tests, which are covered by new test suite

Author: delan

tests/test_macros.rs

@@ -150,14 +150,6 @@ fn test_pipe() {
 
     let wc_cmd = "wc";
     assert!(run_cmd!(ls | $wc_cmd).is_ok());
-
-    // test pipefail
-    assert!(run_cmd!(false | true).is_err());
-    assert!(run_fun!(false | true).is_err());
-    assert!(run_fun!(ignore false | true).is_ok());
-    set_pipefail(false);
-    assert!(run_fun!(false | true).is_ok());
-    set_pipefail(true);
 }
 
 #[test]