Rename client to channel

tonic-interop/test.sh

@@ -1,3 +1,19 @@
+#!/usr/bin/env bash
+
+set -eu
+set -o pipefail
+
+SERVER="tonic-interop/bin/darwin/server"
+
+# run the test server
+./"${SERVER}" &
+SERVER_PID=$!
+echo ":; started grpc-go test server."
+
+# trap exits to make sure we kill the server process when the script exits,
+# regardless of why (errors, SIGTERM, etc).
+trap 'echo ":; killing test server"; kill ${SERVER_PID};' EXIT
+
  cargo run -p tonic-interop --bin client -- \
  --test_case=empty_unary,large_unary,client_streaming,server_streaming,ping_pong,\
 empty_stream,status_code_and_message,special_status_message,unimplemented_method,\