Adding failing GNU head tests (#1579)

Co-authored-by: Chad Brewbaker <chad@flyingdogsolutions.com>

tests/by-util/test_head.rs

@@ -85,3 +85,74 @@ fn test_verbose() {
         .run()
         .stdout_is_fixture("lorem_ipsum_verbose.expected");
 }
+
+#[test]
+fn test_spams_newline() {
+    new_ucmd!()
+        .pipe_in("a")
+        .succeeds()
+        .stdout_is("a\n");   
+}
+
+#[test]
+fn test_unsupported_byte_syntax() {
+    new_ucmd!()
+        .args(&["-1c"])
+        .pipe_in("abc")
+        .fails()
+        //GNU head returns "a"
+        .stdout_is("")
+        .stderr_is("head: error: Unrecognized option: \'1\'");     
+}
+
+#[test]
+fn test_unsupported_line_syntax() {
+    new_ucmd!()
+        .args(&["-n", "2048m"])
+        .pipe_in("a\n")
+        .fails()
+        //.stdout_is("a\n");  What GNU head returns.
+        .stdout_is("")
+        .stderr_is("head: error: invalid line count \'2048m\': invalid digit found in string");     
+}
+
+#[test]
+fn test_unsupported_zero_terminated_syntax() {
+    new_ucmd!()
+        .args(&["-z -n 1"])
+        .pipe_in("x\0y")
+        .fails()
+        //GNU Head returns "x\0"
+        .stderr_is("head: error: Unrecognized option: \'z\'");     
+}
+
+#[test]
+fn test_unsupported_zero_terminated_syntax_2() {
+    new_ucmd!()
+        .args(&["-z -n 2"])
+        .pipe_in("x\0y")
+        .fails()
+        //GNU Head returns "x\0y"
+        .stderr_is("head: error: Unrecognized option: \'z\'");     
+}
+
+
+#[test]
+fn test_unsupported_negative_byte_syntax() {
+    new_ucmd!()
+        .args(&["--bytes=-2"])
+        .pipe_in("a\n")
+        .fails()
+        //GNU Head returns ""
+        .stderr_is("head: error: invalid byte count \'-2\': invalid digit found in string");     
+}
+
+#[test]
+fn test_bug_in_negative_zero_lines() {
+    new_ucmd!()
+        .args(&["--lines=-0"])
+        .pipe_in("a\nb\n")
+        .succeeds()
+        //GNU Head returns "a\nb\n"
+        .stdout_is("");     
+}