Add test-backend from Zulip server.

Author: rht

.travis.yml

@@ -1,16 +1,42 @@
 language: python
-python:
-  - "2.7"
-  - "3.4"
-  - "3.5"
-  - "3.6"
-env: TEST_SUITE=test-main
+sudo: required
+#python:
+    #  - "2.7"
+    #  - "3.4"
+    #  - "3.5"
+    #  - "3.6"
+env:
+  matrix:
+    - TEST_SUITE=test-main
+  global:
+    - BOTO_CONFIG=/tmp/nowhere
 matrix:
   include:
   - python: "3.6"
     env: TEST_SUITE=lint
   - python: "3.6"
     env: TEST_SUITE=run-mypy
+  - python: "3.4"
+    script:
+    - cd
+    - git clone https://github.com/zulip/zulip.git
+    - cd zulip
+    - sed -i "s|[email protected]|python-zulip-api.git@pull/$TRAVIS_PULL_REQUEST|" requirements/common.txt
+    - ./tools/travis/setup-backend
+    - ./tools/travis/backend
+
+addons:
+  artifacts:
+    paths:
+      # Casper debugging data (screenshots, etc.) is super useful for
+      # debugging test flakes.
+      - $(ls var/casper/* | tr "\n" ":")
+      - $(ls /tmp/zulip-test-event-log/* | tr "\n" ":")
+  postgresql: "9.3"
+    #- ./tools/clean-venv-cache --travis
+    #-  ./tools/clean-npm-cache --travis
+    #-  ./tools/clean-emoji-cache --travis
+    #-  ./tools/travis/backend
 install:
   - tools/provision
   - source zulip-api-py*-venv/bin/activate
@@ -19,3 +45,5 @@ script:
 after_success:
   - pip install codecov
   - codecov
+
+