Perform tests in ci

.gitlab-ci.yml

@@ -13,9 +13,14 @@ before_script:
     - yarn install
 
 stages:
-    - lint
+    - validate
 
 eslint:
-    stage: lint
+    stage: validate
     script:
         - yarn ci-lint
+
+jest:
+    stage: validate
+    script:
+        - yarn jest

__tests__/index.android.js

-import 'react-native';
-import React from 'react';
-// Note: test renderer must be required after react-native.
-import renderer from 'react-test-renderer';
-
-import Index from '../app/app';

package.json

@@ -10,8 +10,11 @@
   "jest": {
     "preset": "react-native",
     "collectCoverage": true,
+    "collectCoverageFrom": [
+      "app/**/*.js"
+    ],
     "coverageReporters": [
-      "text-summary"
+      "text", "text-summary"
     ],
     "modulePaths": [
       ".yarn/"