Add initial implementation of product management API

EndavaTask.Tests/EntityDtoMappingsTests.cs

@@ -0,0 +1,85 @@
+using EndavaTask.Contracts;
+using EndavaTask.Dtos;
+using EndavaTask.Mappings;
+using EndavaTask.Models;
+using Xunit;
+
+namespace EndavaTask.Tests;
+
+public class EntityDtoMappingsTests
+{
+    [Fact]
+    public void Product_ToDto_And_ToEntity_Roundtrip_Works()
+    {
+        var entity = new Product
+        {
+            Id = Guid.NewGuid(),
+            Name = "Keyboard",
+            Price = 90m,
+            CategoryId = Guid.NewGuid()
+        };
+
+        var dto = entity.ToDto();
+        var mappedBack = dto.ToEntity();
+
+        Assert.Equal(entity.Id, dto.Id);
+        Assert.Equal(entity.Name, dto.Name);
+        Assert.Equal(entity.Price, dto.Price);
+        Assert.Equal(entity.CategoryId, dto.CategoryId);
+
+        Assert.Equal(entity.Id, mappedBack.Id);
+        Assert.Equal(entity.Name, mappedBack.Name);
+        Assert.Equal(entity.Price, mappedBack.Price);
+        Assert.Equal(entity.CategoryId, mappedBack.CategoryId);
+    }
+
+    [Fact]
+    public void Category_ToDto_And_ToEntity_Roundtrip_Works()
+    {
+        var entity = new Category
+        {
+            Id = Guid.NewGuid(),
+            Name = "Home",
+            Description = "Home essentials"
+        };
+
+        var dto = entity.ToDto();
+        var mappedBack = dto.ToEntity();
+
+        Assert.Equal(entity.Id, dto.Id);
+        Assert.Equal(entity.Name, dto.Name);
+        Assert.Equal(entity.Description, dto.Description);
+
+        Assert.Equal(entity.Id, mappedBack.Id);
+        Assert.Equal(entity.Name, mappedBack.Name);
+        Assert.Equal(entity.Description, mappedBack.Description);
+    }
+
+    [Fact]
+    public void PagedProducts_ToDto_MapsMetadataAndItems()
+    {
+        var paged = new PagedResult<Product>
+        {
+            Items =
+            [
+                new Product { Id = Guid.NewGuid(), Name = "Laptop", Price = 1200m, CategoryId = Guid.NewGuid() },
+                new Product { Id = Guid.NewGuid(), Name = "Monitor", Price = 300m, CategoryId = Guid.NewGuid() }
+            ],
+            PageNumber = 2,
+            PageSize = 2,
+            TotalCount = 5,
+            TotalPages = 3
+        };
+
+        var dtoPaged = paged.ToDto();
+
+        Assert.Equal(2, dtoPaged.Items.Count);
+        Assert.Equal(2, dtoPaged.PageNumber);
+        Assert.Equal(2, dtoPaged.PageSize);
+        Assert.Equal(5, dtoPaged.TotalCount);
+        Assert.Equal(3, dtoPaged.TotalPages);
+
+        var first = Assert.IsType<ProductDto>(dtoPaged.Items.First());
+        Assert.Equal("Laptop", first.Name);
+    }
+}