feat: Add Jest configuration and tests for project and user handlers

tasker-server/tests/getTasks.test.ts

@@ -0,0 +1,131 @@
+const mockQuery = jest.fn();
+const mockFetchUserWithUserId = jest.fn();
+const mockFetchComments = jest.fn();
+const mockFetchAttachments = jest.fn();
+
+import { handler } from "../src/handlers/getTasks";
+
+jest.mock("@aws-sdk/lib-dynamodb", () => ({
+  DynamoDBDocument: {
+    from: jest.fn(() => ({
+      query: mockQuery,
+    })),
+  },
+}));
+
+jest.mock("@/lib/util", () => ({
+  fetchUserWithUserId: mockFetchUserWithUserId,
+  fetchComments: mockFetchComments,
+  fetchAttachments: mockFetchAttachments,
+}));
+
+describe("getTasks handler", () => {
+  afterAll(() => {
+    jest.restoreAllMocks();
+  });
+
+  it("should retrieve tasks with details and return a 200 response", async () => {
+    const mockTasks = [
+      {
+        taskId: "task_1",
+        title: "Task 1",
+        authorUserId: "user_1",
+        assignedUserId: "user_2",
+      },
+      {
+        taskId: "task_2",
+        title: "Task 2",
+      },
+    ];
+
+    const mockAuthor = { userId: "user_1", username: "AuthorUser" };
+    const mockAssignee = { userId: "user_2", username: "AssigneeUser" };
+    const mockComments = [{ commentId: "comment_1", content: "Nice work!" }];
+    const mockAttachments = [
+      { attachmentId: "attachment_1", name: "file.pdf" },
+    ];
+
+    mockQuery.mockResolvedValue({ Items: mockTasks });
+
+    mockFetchUserWithUserId.mockResolvedValueOnce(mockAuthor);
+    mockFetchUserWithUserId.mockResolvedValueOnce(mockAssignee);
+    mockFetchComments.mockResolvedValue(mockComments);
+    mockFetchAttachments.mockResolvedValue(mockAttachments);
+
+    const event = {
+      queryStringParameters: { projectId: "project_123" },
+    };
+
+    const response = await handler(event);
+
+    expect(mockQuery).toHaveBeenCalledWith({
+      TableName: "mock-task-table",
+      KeyConditionExpression: "category = :category AND projectId = :projectId",
+      IndexName: "GSI-project-id",
+      ExpressionAttributeValues: {
+        ":category": "tasks",
+        ":projectId": "project_123",
+      },
+    });
+
+    expect(response).toEqual({
+      statusCode: 200,
+      headers: {
+        "Content-Type": "application/json",
+        "Access-Control-Allow-Origin": "*",
+      },
+      body: JSON.stringify([
+        {
+          taskId: "task_1",
+          title: "Task 1",
+          authorUserId: "user_1",
+          assignedUserId: "user_2",
+          author: mockAuthor,
+          assignee: mockAssignee,
+          comments: mockComments,
+          attachments: mockAttachments,
+        },
+        {
+          taskId: "task_2",
+          title: "Task 2",
+          author: null,
+          assignee: null,
+          comments: mockComments,
+          attachments: mockAttachments,
+        },
+      ]),
+    });
+  });
+
+  it("should return a 500 response if there is an error", async () => {
+    const mockError = new Error("DynamoDB query error");
+    mockQuery.mockRejectedValue(mockError);
+
+    const event = {
+      queryStringParameters: { projectId: "project_123" },
+    };
+
+    const response = await handler(event);
+
+    expect(mockQuery).toHaveBeenCalledWith({
+      TableName: "mock-task-table",
+      KeyConditionExpression: "category = :category AND projectId = :projectId",
+      IndexName: "GSI-project-id",
+      ExpressionAttributeValues: {
+        ":category": "tasks",
+        ":projectId": "project_123",
+      },
+    });
+
+    expect(response).toEqual({
+      statusCode: 500,
+      headers: {
+        "Content-Type": "application/json",
+        "Access-Control-Allow-Origin": "*",
+      },
+      body: JSON.stringify({
+        message: `Error retrieving tasks: ${mockError.message}`,
+      }),
+    });
+  });
+});