Fix Util.constructHostname bug with us-west-2

Author: jdorn

lib/util.js

@@ -511,10 +511,12 @@ exports.userAgent = userAgent;
  * @returns {string} host name
  */
 exports.constructHostname = function (region, account) {
+  if (region === "us-west-2") {
+    region = null;
+  }
+
   let host;
-  if (region === 'us-west-2') {
-    region = '';
-  } else if (region != null) {
+  if (region != null) {
     if (account.indexOf('.') > 0) {
       account = account.substring(0, account.indexOf('.'));
     }

test/unit/util_test.js

@@ -727,6 +727,43 @@ describe('Util', function () {
     }
   });
 
+  describe("Util.constructHostname", () => {
+    it("works with undefined region", () => {
+      assert.strictEqual(
+        Util.constructHostname(undefined, "abc123"),
+        "abc123.snowflakecomputing.com"
+      );
+    });
+
+    it("adds region to the account", () => {
+      assert.strictEqual(
+        Util.constructHostname("us-west-1", "abc123"),
+        "abc123.us-west-1.snowflakecomputing.com"
+      );
+    });
+
+    it("Skips region when it is us-west-2", () => {
+      assert.strictEqual(
+        Util.constructHostname("us-west-2", "abc123"),
+        "abc123.snowflakecomputing.com"
+      );
+    });
+
+    it("Ignores the account region when a different region is specified", () => {
+      assert.strictEqual(
+        Util.constructHostname("us-east-2", "abc123.us-east-1"),
+        "abc123.us-east-2.snowflakecomputing.com"
+      );
+    });
+
+    it("Uses account region when there is no other region specified", () => {
+      assert.strictEqual(
+        Util.constructHostname(undefined, "abc123.us-east-1"),
+        "abc123.us-east-1.snowflakecomputing.com"
+      );
+    });
+  });
+
   describe('Okta Authentication Retry Condition', () => {
     const testCases =
     [