GitAuto: [FEATURE] Implement Seller API

Src/Controllers/SellerController.cs

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+using Microsoft.AspNetCore.Mvc;
+using Src.Models;
+using Src.Repositories;
+
+namespace Src.Controllers
+{
+    [ApiController]
+    [Route("api/[controller]")]
+    public class SellerController : ControllerBase
+    {
+        private readonly SellerRepository _sellerRepository;
+
+        public SellerController(SellerRepository sellerRepository)
+        {
+            _sellerRepository = sellerRepository;
+        }
+
+        [HttpGet("{id}")]
+        public ActionResult<Seller> GetSeller(int id)
+        {
+            var seller = _sellerRepository.GetSellerById(id);
+            if (seller == null)
+            {
+                return NotFound();
+            }
+            return Ok(seller);
+        }
+
+        [HttpPost]
+        public ActionResult CreateSeller(Seller seller)
+        {
+            _sellerRepository.AddSeller(seller);
+            return CreatedAtAction(nameof(GetSeller), new { id = seller.Id }, seller);
+        }
+    }
+}

Src/Models/Seller.cs

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+namespace Src.Models
+{
+    public class Seller
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public string ContactInfo { get; set; }
+
+        // Additional properties can be added here
+    }
+}

Src/Repositories/SellerRepository.cs

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+using System.Collections.Generic;
+using Src.Models;
+
+namespace Src.Repositories
+{
+    public class SellerRepository
+    {
+        private readonly List<Seller> _sellers = new List<Seller>();
+
+        public Seller GetSellerById(int id)
+        {
+            return _sellers.Find(s => s.Id == id);
+        }
+
+        public void AddSeller(Seller seller)
+        {
+            _sellers.Add(seller);
+        }
+
+        public void UpdateSeller(Seller seller)
+        {
+            var existingSeller = GetSellerById(seller.Id);
+            if (existingSeller != null)
+            {
+                existingSeller.Name = seller.Name;
+                existingSeller.ContactInfo = seller.ContactInfo;
+            }
+        }
+    }
+}

Tests/SellerAPI.Tests/SellerControllerTests.cs

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+using Microsoft.AspNetCore.Mvc;
+using Src.Controllers;
+using Src.Models;
+using Src.Repositories;
+using Xunit;
+
+namespace Tests.SellerAPI.Tests
+{
+    public class SellerControllerTests
+    {
+        private readonly SellerController _controller;
+        private readonly SellerRepository _repository;
+
+        public SellerControllerTests()
+        {
+            _repository = new SellerRepository();
+            _controller = new SellerController(_repository);
+        }
+
+        [Fact]
+        public void GetSeller_ReturnsNotFound_WhenSellerDoesNotExist()
+        {
+            var result = _controller.GetSeller(1);
+            Assert.IsType<NotFoundResult>(result.Result);
+        }
+
+        [Fact]
+        public void CreateSeller_ReturnsCreatedAtActionResult()
+        {
+            var seller = new Seller { Id = 1, Name = "Test Seller", ContactInfo = "[email protected]" };
+            var result = _controller.CreateSeller(seller);
+            Assert.IsType<CreatedAtActionResult>(result);
+        }
+
+        [Fact]
+        public void GetSeller_ReturnsSeller_WhenSellerExists()
+        {
+            var seller = new Seller { Id = 1, Name = "Test Seller", ContactInfo = "[email protected]" };
+            _repository.AddSeller(seller);
+            var result = _controller.GetSeller(1);
+            Assert.IsType<OkObjectResult>(result.Result);
+        }
+    }
+}