testNonutf8Realname/testNonutf8Username: Add support for ERROR instead of FAIL/ERR_INVALIDUSERNAME

This is what Sable does, at it fails to decode non-UTF8 data before
it even tries to parse commands.

irctest/dashboard/format.py

@@ -246,7 +246,17 @@ def build_test_table(
                 row_anchor = md5sum(row_anchor)
 
             row = HTML.tr(
-                HTML.th(HTML.a(test_name, href=f"#{row_anchor}"), class_="test-name"),
+                HTML.th(
+                    HTML.details(
+                        HTML.summary(HTML.a(test_name, href=f"#{row_anchor}")),
+                        docstring(
+                            getattr(
+                                getattr(module, class_name), test_name.split("[")[0]
+                            )
+                        ),
+                    ),
+                    class_="test-name",
+                ),
                 id=row_anchor,
             )
             rows.append(row)

irctest/server_tests/utf8.py

@@ -57,8 +57,16 @@ class Utf8TestCase(cases.BaseServerTestCase):
         self.sendLine(2, "NICK bar")
         self.clients[2].conn.sendall(b"USER username * * :i\xe8rc\xe9\r\n")
 
-        d = self.clients[2].conn.recv(1024)
-        if b"FAIL " in d or b"468 " in d:  # ERR_INVALIDUSERNAME
+        d = b""
+        while True:
+            try:
+                buf = self.clients[2].conn.recv(1024)
+            except TimeoutError:
+                break
+            if d and not buf:
+                break
+            d += buf
+        if b"FAIL " in d or b"ERROR " in d or b"468 " in d:  # ERR_INVALIDUSERNAME
             return  # nothing more to test
         self.assertIn(b"001 ", d)
 
@@ -72,14 +80,21 @@ class Utf8TestCase(cases.BaseServerTestCase):
 
         self.addClient()
         self.sendLine(2, "NICK bar")
-        self.sendLine(2, "USER 😊😊😊😊😊😊😊😊😊😊 * * :realname")
-        m = self.getRegistrationMessage(2)
-        if m.command in ("FAIL", "468"):  # ERR_INVALIDUSERNAME
+        self.clients[2].conn.sendall(b"USER \xe8rc\xe9 * * :readlname\r\n")
+
+        d = b""
+        while True:
+            try:
+                buf = self.clients[2].conn.recv(1024)
+            except TimeoutError:
+                break
+            if d and not buf:
+                break
+            d += buf
+        if b"FAIL " in d or b"ERROR " in d or b"468 " in d:  # ERR_INVALIDUSERNAME
             return  # nothing more to test
-        self.assertMessageMatch(
-            m,
-            command="001",
-        )
+        self.assertIn(b"001 ", d)
+
         self.sendLine(2, "WHOIS bar")
         self.getMessages(2)