tests: Use the supertest agent from common.js for backend tests

src/tests/frontend/travis/runnerBackend.sh

@@ -1,46 +0,0 @@
-#!/bin/sh
-
-pecho() { printf %s\\n "$*"; }
-log() { pecho "$@"; }
-error() { log "ERROR: $@" >&2; }
-fatal() { error "$@"; exit 1; }
-try() { "$@" || fatal "'$@' failed"; }
-
-# Move to the Etherpad base directory.
-MY_DIR=$(try cd "${0%/*}" && try pwd -P) || exit 1
-try cd "${MY_DIR}/../../../.."
-
-try sed -e '
-s!"soffice":[^,]*!"soffice": "/usr/bin/soffice"!
-# Reduce rate limit aggressiveness
-s!"max":[^,]*!"max": 100!
-s!"points":[^,]*!"points": 1000!
-' settings.json.template >settings.json
-
-log "Assuming src/bin/installDeps.sh has already been run"
-node src/node/server.js "${@}" &
-ep_pid=$!
-
-log "Waiting for Etherpad to accept connections (http://localhost:9001)..."
-connected=false
-can_connect() {
-    curl -sSfo /dev/null http://localhost:9001/ || return 1
-    connected=true
-}
-now() { date +%s; }
-start=$(now)
-while [ $(($(now) - $start)) -le 15 ] && ! can_connect; do
-    sleep 1
-done
-[ "$connected" = true ] \
-    || fatal "Timed out waiting for Etherpad to accept connections"
-log "Successfully connected to Etherpad on http://localhost:9001"
-
-log "Running the backend tests..."
-try cd src
-npm test
-exit_code=$?
-
-kill "$ep_pid" && wait "$ep_pid"
-log "Done."
-exit "$exit_code"