[CHORES] add test stage in CI

.gitlab-ci.yml

@@ -8,8 +8,16 @@ cache:
     - ios/
 
 stages:
+  - test
   - build
 
+test:
+  stage: test
+  before_script:
+    - yarn install
+  script:
+    - yarn test -- --coverage --watchAll=false --verbose --collectCoverageFrom="*.tsx"
+
 build:
   stage: build
   before_script: