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

tasker-server/tests/createUser.test.ts

@@ -0,0 +1,104 @@
+const mockPut = jest.fn();
+
+import { handler } from "../src/handlers/createUser";
+import { v4 as uuidv4 } from "uuid";
+import { fetchRandomTeamId } from "@/lib/util";
+
+jest.mock("@aws-sdk/lib-dynamodb", () => ({
+  DynamoDBDocument: {
+    from: jest.fn(() => ({
+      put: mockPut,
+    })),
+  },
+}));
+
+jest.mock("uuid", () => ({
+  v4: jest.fn(),
+}));
+
+jest.mock("@/lib/util", () => ({
+  fetchRandomTeamId: jest.fn(),
+}));
+
+describe("createUser handler", () => {
+  beforeAll(() => {
+    jest.spyOn(console, "info").mockImplementation(jest.fn());
+  });
+
+  afterAll(() => {
+    jest.restoreAllMocks();
+  });
+
+  it("should create a new user and log a success message", async () => {
+    const mockUUID = "mock-uuid";
+    const mockTeamId = "team-123";
+    (uuidv4 as jest.Mock).mockReturnValue(mockUUID);
+    (fetchRandomTeamId as jest.Mock).mockResolvedValue(mockTeamId);
+
+    const event = {
+      request: {
+        userAttributes: {
+          preferred_username: "testUser",
+          sub: "cognito-123",
+        },
+      },
+      userName: "fallbackUser",
+    };
+
+    mockPut.mockResolvedValue({});
+
+    const response = await handler(event);
+
+    expect(fetchRandomTeamId).toHaveBeenCalled();
+    expect(mockPut).toHaveBeenCalledWith({
+      TableName: "mock-user-table",
+      Item: {
+        category: "users",
+        cognitoId: "cognito-123",
+        userId: `user_${mockUUID}`,
+        username: "testUser",
+        profilePictureUrl: "p0.jpeg",
+        teamId: mockTeamId,
+      },
+    });
+
+    expect(response).toEqual(event);
+  });
+
+  it("should throw an error if DynamoDB operation fails", async () => {
+    const mockUUID = "mock-uuid";
+    const mockTeamId = "team-123";
+    (uuidv4 as jest.Mock).mockReturnValue(mockUUID);
+    (fetchRandomTeamId as jest.Mock).mockResolvedValue(mockTeamId);
+
+    const event = {
+      request: {
+        userAttributes: {
+          preferred_username: "testUser",
+          sub: "cognito-123",
+        },
+      },
+      userName: "fallbackUser",
+    };
+
+    const mockError = new Error("DynamoDB error");
+    mockPut.mockRejectedValue(mockError);
+
+    await expect(handler(event)).rejects.toThrow(
+      "Error creating user: DynamoDB error"
+    );
+
+    expect(fetchRandomTeamId).toHaveBeenCalled();
+    expect(mockPut).toHaveBeenCalledWith({
+      TableName: "mock-user-table",
+      Item: {
+        category: "users",
+        cognitoId: "cognito-123",
+        userId: `user_${mockUUID}`,
+        username: "testUser",
+        profilePictureUrl: "p0.jpeg",
+        teamId: mockTeamId,
+      },
+    });
+  });
+});