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

tasker-server/tests/getUser.test.ts

@@ -0,0 +1,115 @@
+const mockQuery = jest.fn();
+
+import { handler } from "../src/handlers/getUser";
+
+jest.mock("@aws-sdk/lib-dynamodb", () => ({
+  DynamoDBDocument: {
+    from: jest.fn(() => ({
+      query: mockQuery,
+    })),
+  },
+}));
+
+describe("getUser handler", () => {
+  afterAll(() => {
+    jest.restoreAllMocks();
+  });
+
+  it("should retrieve a user and return a 200 response", async () => {
+    const mockUser = {
+      cognitoId: "cognito_123",
+      userId: "user_1",
+      username: "TestUser",
+      category: "users",
+    };
+
+    mockQuery.mockResolvedValue({
+      Items: [mockUser],
+    });
+
+    const event = {
+      pathParameters: { cognitoId: "cognito_123" },
+    };
+
+    const response = await handler(event);
+
+    expect(mockQuery).toHaveBeenCalledWith({
+      TableName: "mock-user-table",
+      KeyConditionExpression: "category = :category AND cognitoId = :cognitoId",
+      ExpressionAttributeValues: {
+        ":category": "users",
+        ":cognitoId": "cognito_123",
+      },
+    });
+
+    expect(response).toEqual({
+      statusCode: 200,
+      headers: {
+        "Content-Type": "application/json",
+        "Access-Control-Allow-Origin": "*",
+      },
+      body: JSON.stringify(mockUser),
+    });
+  });
+
+  it("should return an empty object if no user is found", async () => {
+    mockQuery.mockResolvedValue({
+      Items: [],
+    });
+
+    const event = {
+      pathParameters: { cognitoId: "cognito_456" },
+    };
+
+    const response = await handler(event);
+
+    expect(mockQuery).toHaveBeenCalledWith({
+      TableName: "mock-user-table",
+      KeyConditionExpression: "category = :category AND cognitoId = :cognitoId",
+      ExpressionAttributeValues: {
+        ":category": "users",
+        ":cognitoId": "cognito_456",
+      },
+    });
+
+    expect(response).toEqual({
+      statusCode: 200,
+      headers: {
+        "Content-Type": "application/json",
+        "Access-Control-Allow-Origin": "*",
+      },
+      body: JSON.stringify({}),
+    });
+  });
+
+  it("should return a 500 response if there is an error", async () => {
+    const mockError = new Error("DynamoDB query error");
+    mockQuery.mockRejectedValue(mockError);
+
+    const event = {
+      pathParameters: { cognitoId: "cognito_123" },
+    };
+
+    const response = await handler(event);
+
+    expect(mockQuery).toHaveBeenCalledWith({
+      TableName: "mock-user-table",
+      KeyConditionExpression: "category = :category AND cognitoId = :cognitoId",
+      ExpressionAttributeValues: {
+        ":category": "users",
+        ":cognitoId": "cognito_123",
+      },
+    });
+
+    expect(response).toEqual({
+      statusCode: 500,
+      headers: {
+        "Content-Type": "application/json",
+        "Access-Control-Allow-Origin": "*",
+      },
+      body: JSON.stringify({
+        message: `Error retrieving user: ${mockError.message}`,
+      }),
+    });
+  });
+});