diff --git a/irctest/cases.py b/irctest/cases.py
index bb0a4ce..8d9cbe0 100644
--- a/irctest/cases.py
+++ b/irctest/cases.py
@@ -86,3 +86,17 @@ class ClientNegociationHelper:
         else:
             return True
 
+    def negociateCapabilities(self, cap_ls):
+        self.sendLine('CAP * LS :')
+        while True:
+            m = self.getMessage(filter_pred=self.userNickPredicate)
+            self.assertEqual(m.command, 'CAP')
+            self.assertGreater(len(m.params), 0, m)
+            if m.params[0] == 'REQ':
+                self.assertEqual(len(m.params), 2, m)
+                requested = frozenset(m.params[1].split())
+                if not requested.issubset(cap_ls):
+                    self.sendLine('CAP * NAK :{}'.format(m.params[1])[0:100])
+            else:
+                return m
+
diff --git a/irctest/clienttests/test_cap.py b/irctest/clienttests/test_cap.py
index 2a6f1bc..d3075ae 100644
--- a/irctest/clienttests/test_cap.py
+++ b/irctest/clienttests/test_cap.py
@@ -7,6 +7,5 @@ class CapTestCase(cases.BaseClientTestCase, cases.ClientNegociationHelper):
 
     def testEmptyCapLs(self):
         self.readCapLs()
-        self.sendLine('CAP * LS :')
-        m = self.getMessage(filter_pred=self.userNickPredicate)
+        m = self.negociateCapabilities([])
         self.assertEqual(m, Message([], None, 'CAP', ['END']))
diff --git a/irctest/controllers/sopel.py b/irctest/controllers/sopel.py
new file mode 100644
index 0000000..f4e3c9f
--- /dev/null
+++ b/irctest/controllers/sopel.py
@@ -0,0 +1,53 @@
+import os
+import tempfile
+import subprocess
+
+from irctest.basecontrollers import BaseClientController
+
+TEMPLATE_CONFIG = """
+[core]
+nick = Sopel
+host = {hostname}
+use_ssl = false
+port = {port}
+owner = me
+channels = 
+"""
+
+class SopelController(BaseClientController):
+    def __init__(self):
+        super().__init__()
+        self.filename = next(tempfile._get_candidate_names())
+        self.proc = None
+    def __del__(self):
+        if self.proc:
+            self.proc.kill()
+        if self.filename:
+            try:
+                os.unlink(os.path.join(os.path.expanduser('~/.sopel/'),
+                    self.filename))
+            except OSError: # File does not exist
+                pass
+
+    def open_file(self, filename):
+        return open(os.path.join(os.path.expanduser('~/.sopel/'), filename),
+                'a')
+
+    def create_config(self):
+        self.directory = tempfile.TemporaryDirectory()
+        with self.open_file(self.filename) as fd:
+            pass
+
+    def run(self, hostname, port, authentication):
+        # Runs a client with the config given as arguments
+        self.create_config()
+        with self.open_file(self.filename) as fd:
+            fd.write(TEMPLATE_CONFIG.format(
+                hostname=hostname,
+                port=port,
+                ))
+        self.proc = subprocess.Popen(['sopel', '-c', self.filename])
+
+def get_irctest_controller_class():
+    return SopelController
+