[Identity] Fixing certificate test inconsistencies, including min-max live tests. (Azure#19810)

* skipping if the certificacte file cant be found

* error details

* what if we use a fake http client to prevent requests to resolve too fast

* ok also skipping if the file isnt found

* lint fix

Author: sadasant

sdk/identity/identity/test/public/node/clientCertificateCredential.spec.ts

@@ -4,13 +4,15 @@
 /* eslint-disable @typescript-eslint/no-non-null-asserted-optional-chain */
 
 import * as path from "path";
+import fs from "fs";
 import { assert } from "chai";
 import { AbortController } from "@azure/abort-controller";
 import { env, isPlaybackMode, delay, isLiveMode } from "@azure-tools/test-recorder";
 import { MsalTestCleanup, msalNodeTestSetup, testTracing } from "../../msalTestUtils";
 import { ClientCertificateCredential } from "../../../src";
 import { Context } from "mocha";
 import { readFileSync } from "fs";
+import { PipelineRequest, PipelineResponse } from "@azure/core-rest-pipeline";
 
 const ASSET_PATH = "assets";
 
@@ -82,10 +84,27 @@ describe("ClientCertificateCredential", function () {
     assert.ok(token?.expiresOnTimestamp! > Date.now());
   });
 
-  it("allows cancelling the authentication", async function () {
-    const credential = new ClientCertificateCredential(env.AZURE_TENANT_ID, env.AZURE_CLIENT_ID, {
-      certificatePath,
-    });
+  it("allows cancelling the authentication", async function (this: Context) {
+    if (!fs.existsSync(certificatePath)) {
+      // In min-max tests, the certificate file can't be found.
+      console.log("Failed to locate the certificate file. Skipping.");
+      this.skip();
+    }
+    const credential = new ClientCertificateCredential(
+      env.AZURE_TENANT_ID,
+      env.AZURE_CLIENT_ID,
+      {
+        certificatePath,
+      },
+      {
+        httpClient: {
+          async sendRequest(_request: PipelineRequest): Promise<PipelineResponse> {
+            await delay(100);
+            throw new Error("Fake HTTP client.");
+          },
+        },
+      }
+    );
 
     const controller = new AbortController();
     const getTokenPromise = credential.getToken(scope, {