Only retry errors if 429, 500 or 503 response codes during Partial Accept (#1005)

* Only retry errors if 429, 500 or 503 response codes during Partial Accept

* Update test

Author: hectorhdzg

Library/Sender.ts

@@ -233,7 +233,8 @@ class Sender {
                                     let filteredEnvelopes: Contracts.EnvelopeTelemetry[] = [];
                                     if (breezeResponse.errors) {
                                         breezeResponse.errors.forEach(error => {
-                                            if (this._isRetriable(error.statusCode)) {
+                                            // Only retry errors if 429, 500 or 503 response codes
+                                            if (error.statusCode == 429 || error.statusCode == 500 || error.statusCode == 503) {
                                                 filteredEnvelopes.push(envelopes[error.index]);
                                             }
                                         });

Tests/Library/Sender.tests.ts

@@ -167,10 +167,10 @@ describe("Library/Sender", () => {
                 itemsReceived: 4,
                 errors: [{
                     index: 0,
-                    statusCode: 408,
+                    statusCode: 429,
                     message: ""
                 }, {
-                    index: 2,
+                    index: 1,
                     statusCode: 123,
                     message: ""
                 }]