patch 7.4.1278
Problem: When jsonencode() fails it still returns something.
Solution: Return an empty string on failure.
diff --git a/src/testdir/test_channel.py b/src/testdir/test_channel.py
index d8830c5..40a2043 100644
--- a/src/testdir/test_channel.py
+++ b/src/testdir/test_channel.py
@@ -93,6 +93,13 @@
print("sending: {}".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 = '["eval","function(\\"tr\\")", -3]'
+ print("sending: {}".format(cmd))
+ self.request.sendall(cmd.encode('utf-8'))
+ response = "ok"
elif decoded[1] == 'eval-bad':
# Send an eval request missing the third argument.
cmd = '["eval","xxx"]'