fix: Fix TypeScript build errors in ToolsTab tests

The previous test implementation caused build failures due to Jest
hoisting issues with mock variables. This commit fixes the build by
removing mocking in favor of using real schema validation.

- Remove jest.mock() of schemaUtils module that caused initialization errors
- Add beforeEach to clear schema cache between tests
- Use cacheToolOutputSchemas() to set up test scenarios
- Let real validation logic run for more accurate tests
- All tests pass and build succeeds

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

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

client/src/components/__tests__/ToolsTab.test.tsx

@@ -1,36 +1,15 @@
 import { render, screen, fireEvent, act } from "@testing-library/react";
-import { describe, it, expect, jest } from "@jest/globals";
 import "@testing-library/jest-dom";
+import { describe, it, jest, beforeEach } from "@jest/globals";
 import ToolsTab from "../ToolsTab";
 import { Tool } from "@modelcontextprotocol/sdk/types.js";
 import { Tabs } from "@/components/ui/tabs";
-import * as schemaUtils from "@/utils/schemaUtils";
-
-// Mock the schemaUtils module
-// Note: hasOutputSchema checks if a tool's output schema validator has been compiled and cached
-// by cacheToolOutputSchemas. In these tests, we mock it to avoid needing to call
-// cacheToolOutputSchemas for every test that uses tools with output schemas.
-// This keeps the tests focused on the component's behavior rather than schema compilation.
-jest.mock("@/utils/schemaUtils", () => ({
-  ...jest.requireActual("@/utils/schemaUtils"),
-  hasOutputSchema: jest.fn(),
-  validateToolOutput: jest.fn(),
-}));
+import { cacheToolOutputSchemas } from "@/utils/schemaUtils";
 
 describe("ToolsTab", () => {
   beforeEach(() => {
-    jest.clearAllMocks();
-    // Reset to default behavior
-    (schemaUtils.hasOutputSchema as jest.Mock).mockImplementation(
-      (toolName) => {
-        // Only tools with outputSchema property should return true
-        return false;
-      },
-    );
-    (schemaUtils.validateToolOutput as jest.Mock).mockReturnValue({
-      isValid: true,
-      error: null,
-    });
+    // Clear the output schema cache before each test
+    cacheToolOutputSchemas([]);
   });
 
   const mockTools: Tool[] = [
@@ -250,8 +229,8 @@ describe("ToolsTab", () => {
     };
 
     it("should display structured content when present", () => {
-      // Mock hasOutputSchema to return true for this tool
-      (schemaUtils.hasOutputSchema as jest.Mock).mockReturnValue(true);
+      // Cache the tool's output schema so hasOutputSchema returns true
+      cacheToolOutputSchemas([toolWithOutputSchema]);
 
       const structuredResult = {
         content: [],
@@ -272,13 +251,7 @@ describe("ToolsTab", () => {
     });
 
     it("should show validation error for invalid structured content", () => {
-      // Mock hasOutputSchema to return true for this tool
-      (schemaUtils.hasOutputSchema as jest.Mock).mockReturnValue(true);
-      // Mock the validation to fail
-      (schemaUtils.validateToolOutput as jest.Mock).mockReturnValue({
-        isValid: false,
-        error: "temperature must be number",
-      });
+      cacheToolOutputSchemas([toolWithOutputSchema]);
 
       const invalidResult = {
         content: [],
@@ -296,8 +269,7 @@ describe("ToolsTab", () => {
     });
 
     it("should show error when tool with output schema doesn't return structured content", () => {
-      // Mock hasOutputSchema to return true for this tool
-      (schemaUtils.hasOutputSchema as jest.Mock).mockReturnValue(true);
+      cacheToolOutputSchemas([toolWithOutputSchema]);
 
       const resultWithoutStructured = {
         content: [{ type: "text", text: "some result" }],
@@ -317,8 +289,7 @@ describe("ToolsTab", () => {
     });
 
     it("should show unstructured content title when both structured and unstructured exist", () => {
-      // Mock hasOutputSchema to return true for this tool
-      (schemaUtils.hasOutputSchema as jest.Mock).mockReturnValue(true);
+      cacheToolOutputSchemas([toolWithOutputSchema]);
 
       const resultWithBoth = {
         content: [{ type: "text", text: '{"temperature": 25}' }],
@@ -350,8 +321,7 @@ describe("ToolsTab", () => {
     });
 
     it("should show compatibility check when tool has output schema", () => {
-      // Mock hasOutputSchema to return true for this tool
-      (schemaUtils.hasOutputSchema as jest.Mock).mockReturnValue(true);
+      cacheToolOutputSchemas([toolWithOutputSchema]);
 
       const compatibleResult = {
         content: [{ type: "text", text: '{"temperature": 25}' }],