Enhance Jest configuration and testing infrastructure

- Updated Jest configuration to support ESM and improve test coverage
- Added comprehensive test files for helpers, index, context, and HASS integration
- Configured coverage reporting and added new test scripts
- Updated Jest resolver to handle module resolution for chalk and related packages
- Introduced new test setup files for mocking and environment configuration

__tests__/helpers.test.ts

@@ -0,0 +1,45 @@
+import { jest, describe, it, expect } from '@jest/globals';
+import { formatToolCall } from '../src/helpers.js';
+
+describe('helpers', () => {
+    describe('formatToolCall', () => {
+        it('should format an object into the correct structure', () => {
+            const testObj = { name: 'test', value: 123 };
+            const result = formatToolCall(testObj);
+
+            expect(result).toEqual({
+                content: [{
+                    type: 'text',
+                    text: JSON.stringify(testObj, null, 2),
+                    isError: false
+                }]
+            });
+        });
+
+        it('should handle error cases correctly', () => {
+            const testObj = { error: 'test error' };
+            const result = formatToolCall(testObj, true);
+
+            expect(result).toEqual({
+                content: [{
+                    type: 'text',
+                    text: JSON.stringify(testObj, null, 2),
+                    isError: true
+                }]
+            });
+        });
+
+        it('should handle empty objects', () => {
+            const testObj = {};
+            const result = formatToolCall(testObj);
+
+            expect(result).toEqual({
+                content: [{
+                    type: 'text',
+                    text: '{}',
+                    isError: false
+                }]
+            });
+        });
+    });
+});