Assert that x-goog-generation is present

Author: nicktindall

test/framework/src/main/java/org/elasticsearch/repositories/blobstore/AbstractBlobContainerRetriesTestCase.java

@@ -189,6 +189,7 @@ public void testReadRangeBlobWithRetries() throws Exception {
                 final int effectiveRangeEnd = Math.min(bytes.length - 1, rangeEnd);
                 final int length = (effectiveRangeEnd - rangeStart) + 1;
                 exchange.getResponseHeaders().add("Content-Type", bytesContentType());
+                addSuccessfulDownloadHeaders(exchange);
                 exchange.sendResponseHeaders(HttpStatus.SC_OK, length);
                 exchange.getResponseBody().write(bytes, rangeStart, length);
                 exchange.close();