chore: fix unit tests for android api28 (#1566)

* chore: fix unit tests for android api28

Author: SvetoslavTsenov

Diff for: tests/app/App_Resources/Android/AndroidManifest.xml

@@ -23,6 +23,7 @@
 		android:allowBackup="true"
 		android:icon="@drawable/icon"
 		android:label="@string/app_name"
+		android:usesCleartextTraffic="true" 
 		android:theme="@style/AppTheme" >
 		<activity
 			android:name="com.tns.NativeScriptActivity"

Diff for: tests/karma.conf.js

@@ -14,10 +14,10 @@ module.exports = function(config) {
     // list of files / patterns to load in the browser
     files: [
       'app/tests/test-main.js',
-      'app/**/*.js'
+      'app/**/*.js',
+      'src/tests/**/*.js'
     ],
 
-
     // list of files to exclude
     exclude: [
     ],