Frontend API structure.

frontend/app/hooks/useTask.test.ts

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+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
+import { renderHook, act, waitFor } from '@testing-library/react'
+import { useTask } from './useTask'
+import { Task, TaskStatus, UpdateTaskRequest } from '~/types/task'
+import { apiClient } from '~/services/api'
+
+// Mock the API client
+vi.mock('~/services/api', () => ({
+  apiClient: {
+    getTask: vi.fn(),
+    updateTask: vi.fn(),
+    deleteTask: vi.fn(),
+  },
+}))
+
+const mockApiClient = apiClient as {
+  getTask: ReturnType<typeof vi.fn>
+  updateTask: ReturnType<typeof vi.fn>
+  deleteTask: ReturnType<typeof vi.fn>
+}
+
+// Sample task data
+const mockTask: Task = {
+  id: '550e8400-e29b-41d4-a716-446655440000',
+  title: 'Test Task',
+  description: 'Test Description',
+  status: TaskStatus.Todo,
+  created_at: '2023-01-01T00:00:00Z',
+  updated_at: '2023-01-01T00:00:00Z',
+  completed_at: null,
+}
+
+describe('useTask', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('should initialize with default state', () => {
+    const { result } = renderHook(() => useTask())
+
+    expect(result.current.task).toBeNull()
+    expect(result.current.loading).toBe(false)
+    expect(result.current.error).toBeNull()
+  })
+
+  describe('getTask', () => {
+    it('should fetch task successfully', async () => {
+      mockApiClient.getTask.mockResolvedValueOnce(mockTask)
+
+      const { result } = renderHook(() => useTask())
+
+      act(() => {
+        result.current.getTask(mockTask.id)
+      })
+
+      expect(result.current.loading).toBe(true)
+
+      await waitFor(() => {
+        expect(result.current.loading).toBe(false)
+      })
+
+      expect(result.current.task).toEqual(mockTask)
+      expect(result.current.error).toBeNull()
+      expect(mockApiClient.getTask).toHaveBeenCalledWith(mockTask.id)
+    })
+
+    it('should handle fetch errors', async () => {
+      const errorMessage = 'Task not found'
+      mockApiClient.getTask.mockRejectedValueOnce({ message: errorMessage })
+
+      const { result } = renderHook(() => useTask())
+
+      act(() => {
+        result.current.getTask(mockTask.id)
+      })
+
+      await waitFor(() => {
+        expect(result.current.loading).toBe(false)
+      })
+
+      expect(result.current.task).toBeNull()
+      expect(result.current.error).toBe(errorMessage)
+    })
+  })
+
+  describe('updateTask', () => {
+    it('should update task with optimistic update', async () => {
+      const updateData: UpdateTaskRequest = {
+        title: 'Updated Task',
+        status: TaskStatus.Done,
+      }
+      const updatedTask = { ...mockTask, ...updateData }
+
+      mockApiClient.getTask.mockResolvedValueOnce(mockTask)
+      mockApiClient.updateTask.mockResolvedValueOnce(updatedTask)
+
+      const { result } = renderHook(() => useTask())
+
+      // Set initial task
+      await act(async () => {
+        await result.current.getTask(mockTask.id)
+      })
+
+      let updateResult: Task | null = null
+
+      await act(async () => {
+        updateResult = await result.current.updateTask(mockTask.id, updateData)
+      })
+
+      expect(updateResult).toEqual(updatedTask)
+      expect(mockApiClient.updateTask).toHaveBeenCalledWith(
+        mockTask.id,
+        updateData
+      )
+    })
+
+    it('should handle update errors and revert optimistic update', async () => {
+      const updateData: UpdateTaskRequest = { status: TaskStatus.Done }
+      const errorMessage = 'Update failed'
+
+      // Setup initial task
+      mockApiClient.getTask.mockResolvedValueOnce(mockTask)
+
+      const { result } = renderHook(() => useTask())
+
+      // Set initial task state
+      await act(async () => {
+        await result.current.getTask(mockTask.id)
+      })
+
+      expect(result.current.task).toEqual(mockTask)
+
+      // Mock update failure and revert call
+      mockApiClient.updateTask.mockRejectedValueOnce({ message: errorMessage })
+      mockApiClient.getTask.mockResolvedValueOnce(mockTask)
+
+      let updateResult: Task | null = null
+
+      await act(async () => {
+        updateResult = await result.current.updateTask(mockTask.id, updateData)
+      })
+
+      expect(updateResult).toBeNull()
+      expect(result.current.error).toBe(errorMessage)
+      expect(result.current.loading).toBe(false)
+    })
+  })
+
+  describe('deleteTask', () => {
+    it('should delete task successfully', async () => {
+      mockApiClient.deleteTask.mockResolvedValueOnce(undefined)
+
+      const { result } = renderHook(() => useTask())
+
+      // Set initial task
+      await act(async () => {
+        mockApiClient.getTask.mockResolvedValueOnce(mockTask)
+        await result.current.getTask(mockTask.id)
+      })
+
+      await act(async () => {
+        await result.current.deleteTask(mockTask.id)
+      })
+
+      expect(result.current.task).toBeNull()
+      expect(result.current.error).toBeNull()
+      expect(mockApiClient.deleteTask).toHaveBeenCalledWith(mockTask.id)
+    })
+
+    it('should handle delete errors', async () => {
+      const errorMessage = 'Delete failed'
+      mockApiClient.deleteTask.mockRejectedValueOnce({ message: errorMessage })
+
+      const { result } = renderHook(() => useTask())
+
+      await act(async () => {
+        await result.current.deleteTask(mockTask.id)
+      })
+
+      expect(result.current.error).toBe(errorMessage)
+      expect(result.current.loading).toBe(false)
+    })
+  })
+
+  describe('clearError', () => {
+    it('should clear error state', async () => {
+      mockApiClient.getTask.mockRejectedValueOnce({ message: 'Test error' })
+
+      const { result } = renderHook(() => useTask())
+
+      // Trigger an error
+      await act(async () => {
+        await result.current.getTask(mockTask.id)
+      })
+
+      expect(result.current.error).toBeTruthy()
+
+      // Clear the error
+      act(() => {
+        result.current.clearError()
+      })
+
+      expect(result.current.error).toBeNull()
+    })
+  })
+})