test: make some tests fast and independent of real backend (#579)

* test: make some tests fast and independent of real backend

Some tests rely on random() and Date, which need to be rewritten. The revised
tests are moved forward to prevent being affected by global states from other
tests.

* test: ignore more headers when matching requests

Some of those headers may be affected by Node versions.

* test: ignore headers when matching requests

* test: update request logs

* test: use deterministic username

* test: make request reply more stable

* test: add test:real for testing with real backend

* test: use replay for user-related tests

* test: use log replay for leaderboard tests

* test: log replay for status tests

* test: support setting server URL suffix

* test: remove Travis CI env override

* test: use pollyjs for ACL tests

* test: make cache test faster

* test: use polly for conversation test

* test: use pollyjs for role tests

* test: only test file API when using real backend

Author: hjiang

.travis.yml

@@ -4,15 +4,6 @@ node_js:
   - '10'
 
 sudo: false
-env:
-  global:
-    - S3=true
-    - APPID=QvNM6AG2khJtBQo6WRMWqfLV-gzGzoHsz
-    - APPKEY=be2YmUduiuEnCB2VR9bLRnnV
-    - MASTERKEY=1AqFJWElESSui6JKqHiKnLTY
-    - HOOKKEY=Y7RVPi20qOKQg4Lp8CyY35Lq
-    - STATUS_TARGET_USER_ID=57d7b3c28a51a2004eb9b31d
-    - FILE_ID=577258d732070000567dea7e
 install:
   - npm install -g codecov
   - npm install