test: migrate test suite from Jest to Bun test framework

- Convert test files to use Bun's test framework and mocking utilities
- Update import statements and test syntax
- Add comprehensive test utilities and mock implementations
- Create test migration guide documentation
- Implement helper functions for consistent test setup and teardown
- Add type definitions for improved type safety in tests

__tests__/tools/entity-state.test.ts

@@ -0,0 +1,191 @@
+import { describe, expect, test, beforeEach, afterEach, mock } from "bun:test";
+import {
+    type MockLiteMCPInstance,
+    type Tool,
+    type TestResponse,
+    TEST_CONFIG,
+    createMockLiteMCPInstance,
+    setupTestEnvironment,
+    cleanupMocks,
+    createMockResponse,
+    getMockCallArgs
+} from '../utils/test-utils';
+
+describe('Entity State Tools', () => {
+    let liteMcpInstance: MockLiteMCPInstance;
+    let addToolCalls: Tool[];
+    let mocks: ReturnType<typeof setupTestEnvironment>;
+
+    const mockEntityState = {
+        entity_id: 'light.living_room',
+        state: 'on',
+        attributes: {
+            brightness: 255,
+            color_temp: 400,
+            friendly_name: 'Living Room Light'
+        },
+        last_changed: '2024-03-20T12:00:00Z',
+        last_updated: '2024-03-20T12:00:00Z',
+        context: {
+            id: 'test_context_id',
+            parent_id: null,
+            user_id: null
+        }
+    };
+
+    beforeEach(async () => {
+        // Setup test environment
+        mocks = setupTestEnvironment();
+        liteMcpInstance = createMockLiteMCPInstance();
+
+        // Import the module which will execute the main function
+        await import('../../src/index.js');
+
+        // Get the mock instance and tool calls
+        addToolCalls = liteMcpInstance.addTool.mock.calls.map(call => call.args[0]);
+    });
+
+    afterEach(() => {
+        cleanupMocks({ liteMcpInstance, ...mocks });
+    });
+
+    describe('entity_state tool', () => {
+        test('should successfully get entity state', async () => {
+            // Setup response
+            mocks.mockFetch = mock(() => Promise.resolve(createMockResponse(mockEntityState)));
+            globalThis.fetch = mocks.mockFetch;
+
+            const entityStateTool = addToolCalls.find(tool => tool.name === 'entity_state');
+            expect(entityStateTool).toBeDefined();
+
+            if (!entityStateTool) {
+                throw new Error('entity_state tool not found');
+            }
+
+            const result = await entityStateTool.execute({
+                entity_id: 'light.living_room'
+            }) as TestResponse;
+
+            expect(result.success).toBe(true);
+            expect(result.state).toBe('on');
+            expect(result.attributes).toEqual(mockEntityState.attributes);
+
+            // Verify the fetch call
+            type FetchArgs = [url: string, init: RequestInit];
+            const args = getMockCallArgs<FetchArgs>(mocks.mockFetch);
+            expect(args).toBeDefined();
+
+            if (!args) {
+                throw new Error('No fetch calls recorded');
+            }
+
+            const [urlStr, options] = args;
+            expect(urlStr).toBe(`${TEST_CONFIG.HASS_HOST}/api/states/light.living_room`);
+            expect(options).toEqual({
+                headers: {
+                    Authorization: `Bearer ${TEST_CONFIG.HASS_TOKEN}`,
+                    'Content-Type': 'application/json'
+                }
+            });
+        });
+
+        test('should handle entity not found', async () => {
+            // Setup error response
+            mocks.mockFetch = mock(() => Promise.reject(new Error('Entity not found')));
+            globalThis.fetch = mocks.mockFetch;
+
+            const entityStateTool = addToolCalls.find(tool => tool.name === 'entity_state');
+            expect(entityStateTool).toBeDefined();
+
+            if (!entityStateTool) {
+                throw new Error('entity_state tool not found');
+            }
+
+            const result = await entityStateTool.execute({
+                entity_id: 'light.non_existent'
+            }) as TestResponse;
+
+            expect(result.success).toBe(false);
+            expect(result.message).toBe('Failed to get entity state: Entity not found');
+        });
+
+        test('should require entity_id', async () => {
+            const entityStateTool = addToolCalls.find(tool => tool.name === 'entity_state');
+            expect(entityStateTool).toBeDefined();
+
+            if (!entityStateTool) {
+                throw new Error('entity_state tool not found');
+            }
+
+            const result = await entityStateTool.execute({}) as TestResponse;
+
+            expect(result.success).toBe(false);
+            expect(result.message).toBe('Entity ID is required');
+        });
+
+        test('should handle invalid entity_id format', async () => {
+            const entityStateTool = addToolCalls.find(tool => tool.name === 'entity_state');
+            expect(entityStateTool).toBeDefined();
+
+            if (!entityStateTool) {
+                throw new Error('entity_state tool not found');
+            }
+
+            const result = await entityStateTool.execute({
+                entity_id: 'invalid_entity_id'
+            }) as TestResponse;
+
+            expect(result.success).toBe(false);
+            expect(result.message).toBe('Invalid entity ID format: invalid_entity_id');
+        });
+
+        test('should successfully get multiple entity states', async () => {
+            // Setup response
+            const mockStates = [
+                { ...mockEntityState },
+                {
+                    ...mockEntityState,
+                    entity_id: 'light.kitchen',
+                    attributes: { ...mockEntityState.attributes, friendly_name: 'Kitchen Light' }
+                }
+            ];
+            mocks.mockFetch = mock(() => Promise.resolve(createMockResponse(mockStates)));
+            globalThis.fetch = mocks.mockFetch;
+
+            const entityStateTool = addToolCalls.find(tool => tool.name === 'entity_state');
+            expect(entityStateTool).toBeDefined();
+
+            if (!entityStateTool) {
+                throw new Error('entity_state tool not found');
+            }
+
+            const result = await entityStateTool.execute({
+                entity_id: ['light.living_room', 'light.kitchen']
+            }) as TestResponse;
+
+            expect(result.success).toBe(true);
+            expect(Array.isArray(result.states)).toBe(true);
+            expect(result.states).toHaveLength(2);
+            expect(result.states[0].entity_id).toBe('light.living_room');
+            expect(result.states[1].entity_id).toBe('light.kitchen');
+
+            // Verify the fetch call
+            type FetchArgs = [url: string, init: RequestInit];
+            const args = getMockCallArgs<FetchArgs>(mocks.mockFetch);
+            expect(args).toBeDefined();
+
+            if (!args) {
+                throw new Error('No fetch calls recorded');
+            }
+
+            const [urlStr, options] = args;
+            expect(urlStr).toBe(`${TEST_CONFIG.HASS_HOST}/api/states`);
+            expect(options).toEqual({
+                headers: {
+                    Authorization: `Bearer ${TEST_CONFIG.HASS_TOKEN}`,
+                    'Content-Type': 'application/json'
+                }
+            });
+        });
+    });
+});