Use round-trip test for gzip instead of absolute value

sdk/nodejs/index.ts

@@ -17,9 +17,10 @@ import * as crypto from "crypto";
 import * as fs from "fs";
 import * as os from "os";
 import * as Path from "path";
-import { sprintf } from "sprintf-js";
-import { v4 } from "uuid";
-import { gzipSync } from "zlib";
+import {sprintf} from "sprintf-js";
+import {v4} from "uuid";
+import {gzipSync} from "zlib";
+import * as zlib from "zlib";
 
 const titleCase = require("title-case");
 
@@ -77,10 +78,9 @@ export function base64encode(unencoded: string): string {
  * @param unencoded the string to compress and encode
  */
 export function base64gzip(unencoded: string): string {
-    // TODO(jen20): The zlib default options differ from those in Go, such that the output is different
-    // from Terraform (as per the tests, though this may also differ by which version of Go Terraform has
-    // been compiled with. To make the tests pass, figure out which options are different.
-    const compressed = gzipSync(unencoded);
+    const compressed = gzipSync(unencoded, {
+        level: zlib.constants.Z_DEFAULT_COMPRESSION,
+    });
     return compressed.toString("base64");
 }
 

sdk/nodejs/tests/tests.ts

@@ -13,9 +13,10 @@
 // limitations under the License.
 
 import * as bcryptjs from "bcryptjs";
-import { assert } from "chai";
+import {assert} from "chai";
 import * as os from "os";
 import * as sut from "../index";
+import {gunzipSync} from "zlib";
 
 const validator = require("validator");
 
@@ -56,7 +57,9 @@ describe("base64encode", () => {
 
 describe("base64gzip", () => {
     it("works", () => {
-        assert.equal(sut.base64gzip("test"), "H4sIAAAAAAAA/ypJLS4BAAAA//8BAAD//wx+f9gEAAAA");
+        const zipped = sut.base64gzip("test");
+
+        assert.equal(gunzipSync(Buffer.from(zipped, 'base64')).toString('utf-8'), 'test');
     });
 });