lib1560: verify more scheme guessing

- on 2nd level domains
- on names without dots

As mentioned in #11161, "imap.com" will be guessed IMAP

Closes #11219

tests/libtest/lib1560.c

@@ -592,6 +592,42 @@ static const struct urltestcase get_url_list[] = {
   {"example.com/path/html",
    "http://example.com/path/html",
    CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"smtp.com/path/html",
+   "smtp://smtp.com/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"dict.com/path/html",
+   "dict://dict.com/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"pop3.com/path/html",
+   "pop3://pop3.com/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"ldap.com/path/html",
+   "ldap://ldap.com/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"imap.com/path/html",
+   "imap://imap.com/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"ftp.com/path/html",
+   "ftp://ftp.com/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"smtp/path/html",
+   "http://smtp/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"dict/path/html",
+   "http://dict/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"pop3/path/html",
+   "http://pop3/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"ldap/path/html",
+   "http://ldap/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"imap/path/html",
+   "http://imap/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
+  {"ftp/path/html",
+   "http://ftp/path/html",
+   CURLU_GUESS_SCHEME, 0, CURLUE_OK},
   {"HTTP://test/", "http://test/", 0, 0, CURLUE_OK},
   {"http://HO0_-st..~./", "http://HO0_-st..~./", 0, 0, CURLUE_OK},
   {"http:/@example.com: 123/", "", 0, 0, CURLUE_MALFORMED_INPUT},