comm: permit and test separators that contain a hyphen

src/uu/comm/src/comm.rs

@@ -186,6 +186,7 @@ pub fn uu_app() -> Command {
                 .help("separate columns with STR")
                 .value_name("STR")
                 .default_value(options::DELIMITER_DEFAULT)
+                .allow_hyphen_values(true)
                 .hide_default_value(true),
         )
         .arg(

tests/by-util/test_comm.rs

@@ -91,6 +91,22 @@ fn output_delimiter() {
         .stdout_only_fixture("ab_delimiter_word.expected");
 }
 
+#[test]
+fn output_delimiter_hyphen_one() {
+    new_ucmd!()
+        .args(&["--output-delimiter", "-1", "a", "b"])
+        .succeeds()
+        .stdout_only_fixture("ab_delimiter_hyphen_one.expected");
+}
+
+#[test]
+fn output_delimiter_hyphen_help() {
+    new_ucmd!()
+        .args(&["--output-delimiter", "--help", "a", "b"])
+        .succeeds()
+        .stdout_only_fixture("ab_delimiter_hyphen_help.expected");
+}
+
 #[test]
 fn output_delimiter_nul() {
     new_ucmd!()

tests/fixtures/comm/ab_delimiter_hyphen_help.expected

@@ -0,0 +1,3 @@
+a
+--helpb
+--help--helpz

tests/fixtures/comm/ab_delimiter_hyphen_one.expected

@@ -0,0 +1,3 @@
+a
+-1b
+-1-1z