Fix unit tests

runtime/ms-rest-azure/.vscode/launch.json

@@ -5,7 +5,7 @@
           "type": "node",
           "request": "launch",
           "name": "Mocha All",
-          "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+          "program": "${workspaceFolder}/../../node_modules/mocha/bin/_mocha",
           "args": [
               "--timeout",
               "999999",
@@ -19,7 +19,7 @@
           "type": "node",
           "request": "launch",
           "name": "Mocha Current File",
-          "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+          "program": "${workspaceFolder}/../../node_modules/mocha/bin/_mocha",
           "args": [
               "--timeout",
               "999999",

runtime/ms-rest-azure/test/msiAppServiceTokenCredentialTests.js

@@ -31,7 +31,7 @@ describe('MSI App Service Authentication', function () {
     if (!error) {
       interceptor.reply(200, response);
     } else {
-      interceptor.replyWithError(error);
+      interceptor.reply(400, error);
     }
   }