diff --git a/test/mitmproxy/test_proxy.py b/test/mitmproxy/test_proxy.py
index 848380189..f7c64e506 100644
--- a/test/mitmproxy/test_proxy.py
+++ b/test/mitmproxy/test_proxy.py
@@ -85,22 +85,22 @@ class TestProcessProxyOptions:
 
     @mock.patch("mitmproxy.platform.resolver")
     def test_modes(self, _):
-        # self.assert_noerr("-R", "http://localhost")
-        # self.assert_err("expected one argument", "-R")
-        # self.assert_err("Invalid server specification", "-R", "reverse")
-        #
-        # self.assert_noerr("-T")
-        #
-        # self.assert_noerr("-U", "http://localhost")
-        # self.assert_err("expected one argument", "-U")
-        # self.assert_err("Invalid server specification", "-U", "upstream")
-        #
-        # self.assert_noerr("--upstream-auth", "test:test")
-        # self.assert_err("expected one argument", "--upstream-auth")
+        self.assert_noerr("-R", "http://localhost")
+        self.assert_err("expected one argument", "-R")
+        self.assert_err("Invalid server specification", "-R", "reverse")
+
+        self.assert_noerr("-T")
+
+        self.assert_noerr("-U", "http://localhost")
+        self.assert_err("expected one argument", "-U")
+        self.assert_err("Invalid server specification", "-U", "upstream")
+
+        self.assert_noerr("--upstream-auth", "test:test")
+        self.assert_err("expected one argument", "--upstream-auth")
         self.assert_err(
             "Invalid upstream auth specification", "--upstream-auth", "test"
         )
-        # self.assert_err("mutually exclusive", "-R", "http://localhost", "-T")
+        self.assert_err("mutually exclusive", "-R", "http://localhost", "-T")
 
     def test_socks_auth(self):
         self.assert_err(