MAGETWO-66627: [GitHub] Default Post Code is applied for all Order's addresses if zip is not required

Author: slamking

app/code/Magento/Checkout/view/base/web/js/model/default-post-code-resolver.js

@@ -14,10 +14,10 @@ define([], function () {
         /**
          * Resolve default post code
          *
-         * @returns {String|undefined}
+         * @returns {String|null}
          */
         resolve: function () {
-            return useDefaultPostCode ?  window.checkoutConfig.defaultPostcode : undefined;
+            return useDefaultPostCode ?  window.checkoutConfig.defaultPostcode : null;
         },
 
         /**

app/code/Magento/Ui/view/base/web/js/form/element/region.js

@@ -35,10 +35,7 @@ define([
                 return;
             }
             option = options[value];
-            // jscs:disable requireCamelCaseOrUpperCaseIdentifiers
-            defaultPostCodeResolver.setUseDefaultPostCode(typeof option.is_zipcode_optional !== 'undefined' &&
-                option.is_zipcode_optional === true ? false : true);
-            // jscs:enable requireCamelCaseOrUpperCaseIdentifiers
+            defaultPostCodeResolver.setUseDefaultPostCode(!option['is_zipcode_optional']);
             if (this.skipValidation) {
                 this.validation['required-entry'] = false;
                 this.required(false);

dev/tests/js/jasmine/tests/app/code/Magento/Checkout/base/web/js/model/default-post-code-resolver.test.js

@@ -19,7 +19,7 @@ define([
         });
 
         it('resolve', function () {
-            expect(defaultPostCodeResolver.resolve()).toBeUndefined();
+            expect(defaultPostCodeResolver.resolve()).toBeNull();
         });
         it('resolve with using default code', function () {
             defaultPostCodeResolver.setUseDefaultPostCode(true);