[App Config] Add the prefix if not present for feature flags (Azure#15136)

* Add the prefix if it doesn't start with a featureFlag prefix

* serializeFeatureFlagParam for a feature flag with key="abcd" - test

* put the typeof check before

* delay from recorder

* changelog

Author: HarshaNalluru

sdk/appconfiguration/app-configuration/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Release History
 
+## 1.2.0-beta.2 (Unreleased)
+
+- With [#15136](https://github.com/Azure/azure-sdk-for-js/pull/15136), if the key of a feature flag(setting with `contentType="application/vnd.microsoft.appconfig.ff+json;charset=utf-8"`) doesn't start with `".appconfig.featureflag/"` (featureFlagPrefix), SDK adds the prefix before sending the request.
+
 ## 1.2.0-beta.1 (2021-04-06)
 
 ### New Features

sdk/appconfiguration/app-configuration/src/featureFlag.ts

@@ -242,6 +242,9 @@ export function deserializeFeatureFlag(setting: ConfigurationSetting): FeatureFl
  * @internal
  */
 export function serializeFeatureFlagParam(setting: FeatureFlagParam): ConfigurationSettingParam {
+  if (typeof setting.key === "string" && !setting.key.startsWith(featureFlagPrefix)) {
+    setting.key = featureFlagPrefix + setting.key;
+  }
   const value: JsonFeatureFlag & { id: string } = {
     id: setting.key.replace(featureFlagPrefix, ""),
     description: setting.description,

sdk/appconfiguration/app-configuration/test/public/featureFlag.spec.ts

@@ -16,21 +16,38 @@ import {
 } from "../../src";
 import { Recorder } from "@azure/test-utils-recorder";
 import { Context } from "mocha";
+import { serializeFeatureFlagParam } from "../../src/featureFlag";
 
 describe("AppConfigurationClient - FeatureFlag", () => {
-  let client: AppConfigurationClient;
-  let recorder: Recorder;
+  describe("FeatureFlag configuration setting", () => {
+    let client: AppConfigurationClient;
+    let recorder: Recorder;
 
-  beforeEach(function(this: Context) {
-    recorder = startRecorder(this);
-    client = createAppConfigurationClientForTests() || this.skip();
-  });
+    beforeEach(async function(this: Context) {
+      recorder = startRecorder(this);
+      client = createAppConfigurationClientForTests() || this.skip();
+      baseSetting = {
+        conditions: {
+          clientFilters
+        },
+        enabled: false,
+        isReadOnly: false,
+        key: `${featureFlagPrefix + recorder.getUniqueName("name-1")}`,
+        contentType: featureFlagContentType,
+        description: "I'm a description",
+        label: "label-1"
+      };
+      addResponse = await client.addConfigurationSetting(baseSetting);
+    });
 
-  afterEach(async function(this: Context) {
-    await recorder.stop();
-  });
+    afterEach(async function(this: Context) {
+      await client.deleteConfigurationSetting({
+        key: baseSetting.key,
+        label: baseSetting.label
+      });
+      await recorder.stop();
+    });
 
-  describe("FeatureFlag configuration setting", () => {
     const clientFilters: (
       | Record<string, unknown>
       | FeatureFlagTargetingClientFilter
@@ -64,28 +81,6 @@ describe("AppConfigurationClient - FeatureFlag", () => {
     let baseSetting: FeatureFlag;
     let addResponse: AddConfigurationSettingResponse;
 
-    beforeEach(async () => {
-      baseSetting = {
-        conditions: {
-          clientFilters
-        },
-        enabled: false,
-        isReadOnly: false,
-        key: `${featureFlagPrefix + recorder.getUniqueName("name-1")}`,
-        contentType: featureFlagContentType,
-        description: "I'm a description",
-        label: "label-1"
-      };
-      addResponse = await client.addConfigurationSetting(baseSetting);
-    });
-
-    afterEach(async () => {
-      await client.deleteConfigurationSetting({
-        key: baseSetting.key,
-        label: baseSetting.label
-      });
-    });
-
     function assertFeatureFlagProps(
       actual: Omit<AddConfigurationSettingResponse, "_response">,
       expected: FeatureFlag
@@ -192,4 +187,21 @@ describe("AppConfigurationClient - FeatureFlag", () => {
       await client.deleteConfigurationSetting({ key: secondSetting.key });
     });
   });
+
+  describe("FeatureFlag utils", () => {
+    [featureFlagPrefix + "abcd", "abcd"].forEach((key) => {
+      it(`serializeFeatureFlagParam for a feature flag with key=${key}`, () => {
+        assert.equal(
+          serializeFeatureFlagParam({
+            key,
+            value: `xyz`,
+            conditions: { clientFilters: [] },
+            enabled: false
+          }).key,
+          featureFlagPrefix + "abcd",
+          "Unexpected key in the setting"
+        );
+      });
+    });
+  });
 });

sdk/appconfiguration/app-configuration/test/public/index.spec.ts

@@ -12,8 +12,7 @@ import {
   startRecorder
 } from "./utils/testHelpers";
 import { AppConfigurationClient, ConfigurationSetting, ConfigurationSettingParam } from "../../src";
-import { delay } from "@azure/core-http";
-import { Recorder } from "@azure/test-utils-recorder";
+import { Recorder, delay } from "@azure/test-utils-recorder";
 import { Context } from "mocha";
 
 describe("AppConfigurationClient", () => {
@@ -421,7 +420,6 @@ describe("AppConfigurationClient", () => {
       });
 
       await delay(1000);
-
       await client.setConfigurationSetting({
         key,
         value: "value2"