chore: added unit tests

Author: MathiasVDA

jest.config.js

@@ -14,6 +14,7 @@ module.exports = {
   coverageDirectory: 'coverage',
   coverageReporters: ['text', 'lcov', 'html'],
   moduleNameMapper: {
-    '\\.(css|less|scss|sass)$': 'identity-obj-proxy'
+    '\\.(css|less|scss|sass)$': 'identity-obj-proxy',
+    '^(\\.{1,2}/.*)\\.js$': '$1'
   }
 };