diff --git a/src/testdir/test_channel.py b/src/testdir/test_channel.py
index 61e76ec..227780a 100644
--- a/src/testdir/test_channel.py
+++ b/src/testdir/test_channel.py
@@ -85,16 +85,28 @@
                         print("sending: {0}".format(cmd))
                         self.request.sendall(cmd.encode('utf-8'))
                         response = "ok"
+                    elif decoded[1] == 'eval-special':
+                        # Send an eval request.  We ignore the response.
+                        cmd = '["expr","\\"foo\x7f\x10\x01bar\\"", -2]'
+                        print("sending: {0}".format(cmd))
+                        self.request.sendall(cmd.encode('utf-8'))
+                        response = "ok"
+                    elif decoded[1] == 'eval-getline':
+                        # Send an eval request.  We ignore the response.
+                        cmd = '["expr","getline(3)", -3]'
+                        print("sending: {0}".format(cmd))
+                        self.request.sendall(cmd.encode('utf-8'))
+                        response = "ok"
                     elif decoded[1] == 'eval-fails':
                         # Send an eval request that will fail.
-                        cmd = '["expr","xxx", -2]'
+                        cmd = '["expr","xxx", -4]'
                         print("sending: {0}".format(cmd))
                         self.request.sendall(cmd.encode('utf-8'))
                         response = "ok"
                     elif decoded[1] == 'eval-error':
                         # Send an eval request that works but the result can't
                         # be encoded.
-                        cmd = '["expr","function(\\"tr\\")", -3]'
+                        cmd = '["expr","function(\\"tr\\")", -5]'
                         print("sending: {0}".format(cmd))
                         self.request.sendall(cmd.encode('utf-8'))
                         response = "ok"
diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index dd40187..b356c88 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -192,20 +192,31 @@
   sleep 10m
   call assert_equal([-1, 'foo123'], ch_evalexpr(handle, 'eval-result'))
 
+  " Send an eval request with special characters.
+  call assert_equal('ok', ch_evalexpr(handle, 'eval-special'))
+  sleep 10m
+  call assert_equal([-2, "foo\x7f\x10\x01bar"], ch_evalexpr(handle, 'eval-result'))
+
+  " Send an eval request to get a line with special characters.
+  call setline(3, "a\nb\<CR>c\x01d\x7fe")
+  call assert_equal('ok', ch_evalexpr(handle, 'eval-getline'))
+  sleep 10m
+  call assert_equal([-3, "a\nb\<CR>c\x01d\x7fe"], ch_evalexpr(handle, 'eval-result'))
+
   " Send an eval request that fails.
   call assert_equal('ok', ch_evalexpr(handle, 'eval-fails'))
   sleep 10m
-  call assert_equal([-2, 'ERROR'], ch_evalexpr(handle, 'eval-result'))
+  call assert_equal([-4, 'ERROR'], ch_evalexpr(handle, 'eval-result'))
 
   " Send an eval request that works but can't be encoded.
   call assert_equal('ok', ch_evalexpr(handle, 'eval-error'))
   sleep 10m
-  call assert_equal([-3, 'ERROR'], ch_evalexpr(handle, 'eval-result'))
+  call assert_equal([-5, 'ERROR'], ch_evalexpr(handle, 'eval-result'))
 
   " Send a bad eval request. There will be no response.
   call assert_equal('ok', ch_evalexpr(handle, 'eval-bad'))
   sleep 10m
-  call assert_equal([-3, 'ERROR'], ch_evalexpr(handle, 'eval-result'))
+  call assert_equal([-5, 'ERROR'], ch_evalexpr(handle, 'eval-result'))
 
   " Send an expr request
   call assert_equal('ok', ch_evalexpr(handle, 'an expr'))