chore: return unit tests in travis

.travis.yml

@@ -90,14 +90,42 @@ matrix:
         - cd ../demo-vue
         - tns plugin add ../publish/package/*.tgz
         - tns build android --bundle --env.uglify --env.aot
+    - os: linux
+      language: android
+      dist: trusty
+      jdk: oraclejdk8
+      env: 
+        - Android="UnitTests"
+      before_script:
+        - echo no | android create avd --force -n test -t android-21 -b armeabi-v7a
+        - emulator -avd test -no-audio -no-window &
+        - android-wait-for-emulator
+      before_install:
+        - nvm install 10
+      script:
+        - cd src && npm i && npm run tsc && npm run tslint && cd ../demo && tns build android
+        - travis_wait travis_retry tns test android --justlaunch
+    - os: osx
+      language: node_js
+      node_js: "10"
+      jdk: oraclejdk8
+      env: 
+        - iOS="UnitTests"
+      osx_image: xcode10.2
+      before_script: pod repo update
+      script: 
+        - cd src && npm i && npm run tsc && npm run tslint && cd ../demo && tns build ios
+        - travis_wait travis_retry tns test ios --justlaunch
 
 android:
   components:
     - tools
     - platform-tools
     - build-tools-28.0.3
+    - android-21
     - android-28
     - extra-android-m2repository
+    - sys-img-armeabi-v7a-android-21
 
 before_install:
     - sudo pip install --upgrade pip