Add integration test project with MediatR procedure tests

Added ReC.Tests project with integration tests for stored procedure commands and queries via MediatR, covering endpoints, actions, results, and profiles. Introduced a test base for DI/configuration, helper for private property access, and updated the solution to include the new test suite. Tests use NUnit and cover both positive and negative scenarios.

tests/ReC.Tests/Application/Endpoints/EndpointProcedureTests.cs

@@ -0,0 +1,61 @@
+using System.Threading.Tasks;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using NUnit.Framework;
+using ReC.Application.Common.Procedures.DeleteProcedure;
+using ReC.Application.Common.Procedures.InsertProcedure;
+using ReC.Application.Common.Procedures.UpdateProcedure;
+using ReC.Application.Endpoints.Commands;
+using ReC.Tests.Application;
+
+namespace ReC.Tests.Application.Endpoints;
+
+[TestFixture]
+public class EndpointProcedureTests : RecApplicationTestBase
+{
+    private (ISender Sender, IServiceScope Scope) CreateScopedSender()
+    {
+        var scope = ServiceProvider.CreateScope();
+        var sender = scope.ServiceProvider.GetRequiredService<ISender>();
+        return (sender, scope);
+    }
+
+    [Test]
+    public async Task InsertEndpointProcedure_runs_via_mediator()
+    {
+        var procedure = new InsertEndpointProcedure { Active = true, Description = "desc", Uri = "http://example" };
+        var objectProc = procedure.ToObjectProcedure("ReC.Tests");
+
+        var (sender, scope) = CreateScopedSender();
+        using var _ = scope;
+        var result = await sender.Send(objectProc);
+
+        Assert.That(result, Is.GreaterThan(0));
+    }
+
+    [Test]
+    public async Task UpdateEndpointProcedure_runs_via_mediator()
+    {
+        var procedure = new UpdateEndpointProcedure { Active = false, Description = "updated", Uri = "http://updated" };
+        var objectProc = procedure.ToObjectProcedure(12, "ReC.Tests");
+
+        var (sender, scope) = CreateScopedSender();
+        using var _ = scope;
+        var result = await sender.Send(objectProc);
+
+        Assert.That(result, Is.EqualTo(0));
+    }
+
+    [Test]
+    public async Task DeleteEndpointProcedure_runs_via_mediator()
+    {
+        var procedure = new DeleteEndpointProcedure { Start = 1, End = 2, Force = true };
+        var objectProc = procedure.ToObjectProcedure();
+
+        var (sender, scope) = CreateScopedSender();
+        using var _ = scope;
+        var result = await sender.Send(objectProc);
+
+        Assert.That(result, Is.EqualTo(0));
+    }
+}