[Recorder] Make TEST_MODE environment variable value case-insensitive (Azure#22118)

Author: timovv

sdk/test-utils/recorder/CHANGELOG.md

@@ -12,6 +12,7 @@
 ### Bugs Fixed
 
 - Fixed redirects not being passed to the test proxy in the browser. [#21713](https://github.com/Azure/azure-sdk-for-js/pull/21713)
+- The value of the `TEST_MODE` environment variable is no longer case-sensitive. [#22118](https://github.com/Azure/azure-sdk-for-js/pull/22118)
 
 ### Other Changes
 

sdk/test-utils/recorder/src/utils/utils.ts

@@ -317,7 +317,7 @@ export function getTestMode(): TestMode {
   if (isPlaybackMode()) {
     return "playback";
   }
-  return env.TEST_MODE as "record" | "live";
+  return env.TEST_MODE?.toLowerCase() as "record" | "live";
 }
 
 /** Make a lazy value that can be deferred and only computed once. */
@@ -327,11 +327,11 @@ export const once = <T>(make: () => T): (() => T) => {
 };
 
 export function isRecordMode() {
-  return env.TEST_MODE === "record";
+  return env.TEST_MODE?.toLowerCase() === "record";
 }
 
 export function isLiveMode() {
-  return env.TEST_MODE === "live";
+  return env.TEST_MODE?.toLowerCase() === "live";
 }
 
 export function isPlaybackMode() {

sdk/test-utils/recorder/test/testProxyClient.spec.ts

@@ -11,7 +11,13 @@ import { expect } from "chai";
 import { env, Recorder } from "../src";
 import { createRecordingRequest } from "../src/utils/createRecordingRequest";
 import { paths } from "../src/utils/paths";
-import { getTestMode, isLiveMode, RecorderError, RecordingStateManager } from "../src/utils/utils";
+import {
+  getTestMode,
+  isLiveMode,
+  isRecordMode,
+  RecorderError,
+  RecordingStateManager,
+} from "../src/utils/utils";
 
 const testRedirectedRequest = (
   client: Recorder,
@@ -296,6 +302,27 @@ describe("TestProxyClient functions", () => {
       expect(returnedRequest.url).to.equal(initialRequest.url);
     });
   });
+
+  describe("getTestMode", () => {
+    it("treats the TEST_MODE environment variable case-insensitively", () => {
+      [
+        "record",
+        "RECORD",
+        "Record",
+        "playback",
+        "PLAYBACK",
+        "Playback",
+        "live",
+        "LIVE",
+        "Live",
+      ].forEach((testMode) => {
+        env.TEST_MODE = testMode;
+        expect(getTestMode()).to.equal(testMode.toLowerCase());
+        expect(isRecordMode()).to.equal(testMode.toLowerCase() === "record");
+        expect(isLiveMode()).to.equal(testMode.toLowerCase() === "live");
+      });
+    });
+  });
 });
 
 describe("State Manager", function () {