add tests

tests/Dynatello.Tests/HandlerTests/DeleteRequestHandlerTests.cs

@@ -0,0 +1,52 @@
+using Amazon.DynamoDBv2;
+using Amazon.DynamoDBv2.Model;
+using AutoFixture;
+using Dynatello.Builders;
+using Dynatello.Handlers;
+using NSubstitute;
+
+namespace Dynatello.Tests.HandlerTests;
+public class DeleteRequestHandlerTests
+{
+
+
+    [Fact]
+    public async Task Send_SuccessMock_ShouldReturnItem()
+    {
+        var amazonDynamoDB = Substitute.For<IAmazonDynamoDB>();
+        var expected = Cat.Fixture.Create<Cat>();
+
+        amazonDynamoDB
+          .DeleteItemAsync(Arg.Any<DeleteItemRequest>())
+          .Returns(new DeleteItemResponse
+          {
+              HttpStatusCode = System.Net.HttpStatusCode.OK,
+              Attributes = Cat.GetById.Marshall(expected)
+          });
+
+        var actual = await Cat.GetById
+          .OnTable("TABLE")
+          .ToDeleteRequestHandler(x => x.ToDeleteRequestBuilder(), x => x.AmazonDynamoDB = amazonDynamoDB)
+          .Send(expected.Id, default);
+
+        Assert.Equal(expected, actual);
+    }
+
+    [Fact]
+    public async Task Send_MissingValue_ShouldReturnNull()
+    {
+        var amazonDynamoDB = Substitute.For<IAmazonDynamoDB>();
+        var expected = Cat.Fixture.Create<Cat>();
+
+        amazonDynamoDB
+          .DeleteItemAsync(Arg.Any<DeleteItemRequest>())
+          .Returns(new DeleteItemResponse { });
+
+        var actual = await Cat.GetById
+          .OnTable("TABLE")
+          .ToDeleteRequestHandler(x => x.ToDeleteRequestBuilder(), x => x.AmazonDynamoDB = amazonDynamoDB)
+          .Send(expected.Id, default);
+
+        Assert.Null(actual);
+    }
+}