Unit Test Setup (#25051)

- setting up first unit test using chai/sinon
- adding ESLint config for VSCode

### Packages impacted by this PR

### Issues associated with this PR

### Describe the problem that is addressed by this PR

### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?

### Are there test cases added in this PR? _(If not, why?)_

### Provide a list of related PRs _(if any)_

### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [] Added impacted package name to the issue description
- [] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [] Added a changelog (if necessary)

sdk/communication/communication-call-automation/.eslintrc.json

@@ -1,8 +1,13 @@
 {
-  "plugins": ["@azure/azure-sdk"],
-  "extends": ["plugin:@azure/azure-sdk/azure-sdk-base"],
+  "plugins": [
+    "@azure/azure-sdk"
+  ],
+  "extends": [
+    "plugin:@azure/azure-sdk/azure-sdk-base",
+    "typescript"
+  ],
   "rules": {
     // Removing `src` would be a breaking change so leaving it for the package owners to address
     "@azure/azure-sdk/ts-package-json-files-required": "warn"
   }
-}
+}

sdk/communication/communication-call-automation/test/public/callAutomationClient.spec.ts

@@ -1,2 +1,50 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT license.
+
+import { CommunicationIdentifier } from "@azure/communication-common";
+import { fail } from "assert";
+import { assert } from "chai";
+import Sinon, { SinonStubbedInstance } from "sinon";
+import { CallAutomationClient } from "../../src/callAutomationClient";
+import { CallConnection } from "../../src/callConnection";
+import { CallConnectionProperties } from "../../src/models/models";
+import { CreateCallResult } from "../../src/models/responses";
+import { CALL_CALLBACK_URL, CALL_TARGET_ID } from "./utils/connectionUtils";
+
+describe("Call Automation Client Unit Tests", () => {
+  var targets: CommunicationIdentifier[];
+  var client: SinonStubbedInstance<CallAutomationClient> & CallAutomationClient;
+
+  beforeEach(() => {
+    // set up
+    targets = [{
+      communicationUserId: CALL_TARGET_ID
+    }];
+    // stub CallAutomationClient
+    client = Sinon.createStubInstance(CallAutomationClient) as SinonStubbedInstance<CallAutomationClient> & CallAutomationClient;
+  });
+
+  it("CreateCall", async () => {
+
+    // mocks
+    const createCallResultMock: CreateCallResult = {
+      callConnectionProperties: {} as CallConnectionProperties,
+      callConnection: {} as CallConnection
+    };
+    client.createCall.returns(new Promise((resolve) => {
+      resolve(createCallResultMock);
+    }));
+
+    var promiseResult = client.createCall(targets, CALL_CALLBACK_URL);
+
+    // asserts
+    promiseResult.then((result: CreateCallResult) => {
+      assert.isNotNull(result);
+      assert.isTrue(client.createCall.calledWith(targets, CALL_CALLBACK_URL));
+      assert.equal(result, createCallResultMock);
+    }).catch((reject) => {
+      fail(reject); // should not reach here
+    });
+  });
+
+})

sdk/communication/communication-call-automation/test/public/utils/connectionUtils.ts

@@ -5,6 +5,20 @@ import { isNode } from "@azure/core-util";
 
 export const baseUri = "https://contoso.api.fake";
 
+export const MOCK_ENDPOINT = "https://REDACTED.communication.azure.com/";
+export const MOCK_CONNECTION_STRING = `endpoint=${MOCK_ENDPOINT};accesskey=eyJhbG`;
+export const CALL_CONNECTION_ID = "callConnectionId";
+export const CALL_SERVER_CALL_ID = "serverCallId";
+export const CALL_CALLER_ID = "callerId";
+export const CALL_CALLER_DISPLAY_NAME = "callerDisplayName";
+export const CALL_TARGET_ID = "targetId";
+export const CALL_CONNECTION_STATE = "connected";
+export const CALL_SUBJECT = "subject";
+export const CALL_CALLBACK_URL = "https://REDACTED.com/events";
+export const CALL_INCOMING_CALL_CONTEXT = "eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.REDACTED";
+export const CALL_OPERATION_CONTEXT = "operationContext";
+export const MEDIA_SUBSCRIPTION_ID = "mediaSubscriptionId";
+
 declare function btoa(stringToEncode: string): string;
 
 export const generateToken = (): string => {