Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/@sinonjs/commons/lib/deprecated.test.js

@@ -0,0 +1,101 @@
+/* eslint-disable no-console */
+"use strict";
+
+var assert = require("@sinonjs/referee-sinon").assert;
+var sinon = require("@sinonjs/referee-sinon").sinon;
+
+var deprecated = require("./deprecated");
+
+var msg = "test";
+
+describe("deprecated", function () {
+    describe("defaultMsg", function () {
+        it("should return a string", function () {
+            assert.equals(
+                deprecated.defaultMsg("sinon", "someFunc"),
+                "sinon.someFunc is deprecated and will be removed from the public API in a future version of sinon."
+            );
+        });
+    });
+
+    describe("printWarning", function () {
+        beforeEach(function () {
+            sinon.replace(process, "emitWarning", sinon.fake());
+        });
+
+        afterEach(sinon.restore);
+
+        describe("when `process.emitWarning` is defined", function () {
+            it("should call process.emitWarning with a msg", function () {
+                deprecated.printWarning(msg);
+                assert.calledOnceWith(process.emitWarning, msg);
+            });
+        });
+
+        describe("when `process.emitWarning` is undefined", function () {
+            beforeEach(function () {
+                sinon.replace(console, "info", sinon.fake());
+                sinon.replace(console, "log", sinon.fake());
+                process.emitWarning = undefined;
+            });
+
+            afterEach(sinon.restore);
+
+            describe("when `console.info` is defined", function () {
+                it("should call `console.info` with a message", function () {
+                    deprecated.printWarning(msg);
+                    assert.calledOnceWith(console.info, msg);
+                });
+            });
+
+            describe("when `console.info` is undefined", function () {
+                it("should call `console.log` with a message", function () {
+                    console.info = undefined;
+                    deprecated.printWarning(msg);
+                    assert.calledOnceWith(console.log, msg);
+                });
+            });
+        });
+    });
+
+    describe("wrap", function () {
+        // eslint-disable-next-line mocha/no-setup-in-describe
+        var method = sinon.fake();
+        var wrapped;
+
+        beforeEach(function () {
+            wrapped = deprecated.wrap(method, msg);
+        });
+
+        it("should return a wrapper function", function () {
+            assert.match(wrapped, sinon.match.func);
+        });
+
+        it("should assign the prototype of the passed method", function () {
+            assert.equals(method.prototype, wrapped.prototype);
+        });
+
+        context("when the passed method has falsy prototype", function () {
+            it("should not be assigned to the wrapped method", function () {
+                method.prototype = null;
+                wrapped = deprecated.wrap(method, msg);
+                assert.match(wrapped.prototype, sinon.match.object);
+            });
+        });
+
+        context("when invoking the wrapped function", function () {
+            before(function () {
+                sinon.replace(deprecated, "printWarning", sinon.fake());
+                wrapped({});
+            });
+
+            it("should call `printWarning` before invoking", function () {
+                assert.calledOnceWith(deprecated.printWarning, msg);
+            });
+
+            it("should invoke the passed method with the given arguments", function () {
+                assert.calledOnceWith(method, {});
+            });
+        });
+    });
+});