Remove all `include ActiveSupport::Testing::MethodCallAssertions`
in actioncable's tests since we can do it only in `ActionCable::TestCase`
in order to prevent code duplication.
We use the same approach for other modules of Rails.
I often face the following error when running test/connection/client_socket_test.rb:
```
$ bin/test test/connection/client_socket_test.rb:38
Run options: --seed 44035
# Running:
F
Failure:
ActionCable::Connection::ClientSocketTest#test_delegate_socket_errors_to_on_error_handler
[/app/actioncable/test/connection/client_socket_test.rb:47]:
--- expected
+++ actual
@@ -1 +1 @@
-["foo"]
+["Broken pipe", "Broken pipe", "Broken pipe", "foo"]
```
It can be reproduced easily by applying the following patch:
```
diff --git a/actioncable/test/connection/client_socket_test.rb b/actioncable/test/connection/client_socket_test.rb
index 2051216010..6bb9f13ea7 100644
--- a/actioncable/test/connection/client_socket_test.rb
+++ b/actioncable/test/connection/client_socket_test.rb
@@ -34,7 +34,8 @@ def on_error(message)
@server.config.allowed_request_origins = %w( http://rubyonrails.com )
end
- test "delegate socket errors to on_error handler" do
+ 1000.times do |i|
+ test "delegate socket errors to on_error handler #{i}" do
run_in_eventmachine do
connection = open_connection
@@ -47,6 +48,7 @@ def on_error(message)
assert_equal %w[ foo ], connection.errors
end
end
+ end
test "closes hijacked i/o socket at shutdown" do
run_in_eventmachine do
```
The cause is writing io from different thread at the same time.
`connection.process` sends handshake message from [StreamEventLoop's thread][] whereas
`connection.handle_open` sends welcome message from current thread.
[StreamEventLoop's thread]: 067fc779c4/actioncable/lib/action_cable/connection/stream_event_loop.rb (L75)
We'll get `Errno::ECONNRESET` if the client forcibly disconnected.
Just close the socket rather than raising the exception.
Handle other errors in `ClientSocket#write`, too, mirroring the Faye
error handling which swallows all `StandardError` on write.
