Added emulator-based integration tests

Author: hiranya911

.github/workflows/ci.yml

@@ -26,3 +26,11 @@ jobs:
     - name: Test with pytest
       if: success() || failure()
       run: pytest
+    - name: Set up Node.js 10
+      uses: actions/setup-node@v1
+      with:
+        node-version: 10.x
+    - name: Run integration tests against emulator
+      run: |
+        npm install -g firebase-tools
+        firebase emulators:exec --only database --project fake-project-id 'pytest integration/test_db.py'

.travis.yml

@@ -1,16 +1,6 @@
 language: python
 python:
   - "3.4"
-  - "3.5"
-  - "3.6"
-  - "3.7"
-  - "pypy3.5"
-
-jobs:
-  include:
-    - name: "Lint"
-      python: "3.7"
-      script: ./lint.sh all
 
 before_install:
   - nvm install 8 && npm install -g firebase-tools