test: add xUnit test project for Svrnty.CQRS core library

Add tests/Svrnty.CQRS.Tests with 61 tests covering:
- CommandMeta and QueryMeta metadata creation and naming conventions
- CommandDiscovery and QueryDiscovery lookup, existence, and enumeration
- DI service registration for commands (with/without result) and queries
- Full pipeline integration (register -> discover -> resolve)
- CqrsBuilder fluent API configuration
- CqrsConfiguration generic storage and mapping callbacks
- Handler execution via DI-resolved instances

Co-Authored-By: Svrnty Inc. <eng@svrnty.com>

Svrnty.CQRS.sln

@@ -43,6 +43,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Events.Abstract
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Events.RabbitMQ", "Svrnty.CQRS.Events.RabbitMQ\Svrnty.CQRS.Events.RabbitMQ.csproj", "{3C7412EF-13C2-41F3-9D4C-D2BEC4843C8C}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{0AB3BF05-4346-4AA6-1389-037BE0695223}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Svrnty.CQRS.Tests", "tests\Svrnty.CQRS.Tests\Svrnty.CQRS.Tests.csproj", "{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -257,10 +261,25 @@ Global
 		{3C7412EF-13C2-41F3-9D4C-D2BEC4843C8C}.Release|x64.Build.0 = Release|Any CPU
 		{3C7412EF-13C2-41F3-9D4C-D2BEC4843C8C}.Release|x86.ActiveCfg = Release|Any CPU
 		{3C7412EF-13C2-41F3-9D4C-D2BEC4843C8C}.Release|x86.Build.0 = Release|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Debug|x64.Build.0 = Debug|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Debug|x86.Build.0 = Debug|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Release|x64.ActiveCfg = Release|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Release|x64.Build.0 = Release|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Release|x86.ActiveCfg = Release|Any CPU
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{BCB3DD95-DFDB-452C-A0AD-AA657AE0C049} = {0AB3BF05-4346-4AA6-1389-037BE0695223}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {D6D431EA-C04F-462B-8033-60F510FEB49E}
 	EndGlobalSection

tests/Svrnty.CQRS.Tests/CommandDiscoveryTests.cs

@@ -0,0 +1,124 @@
+using Svrnty.CQRS.Abstractions.Discovery;
+using Svrnty.CQRS.Discovery;
+
+namespace Svrnty.CQRS.Tests;
+
+public class CommandDiscoveryTests
+{
+    private static CommandDiscovery CreateDiscovery(params ICommandMeta[] metas)
+    {
+        return new CommandDiscovery(metas);
+    }
+
+    [Fact]
+    public void GetCommands_ReturnsAllRegistered()
+    {
+        var meta1 = new CommandMeta(typeof(CreatePersonCommand), typeof(object), typeof(CreatePersonResult));
+        var meta2 = new CommandMeta(typeof(DeletePersonCommand), typeof(object));
+        var discovery = CreateDiscovery(meta1, meta2);
+
+        var commands = discovery.GetCommands().ToList();
+
+        Assert.Equal(2, commands.Count);
+    }
+
+    [Fact]
+    public void GetCommands_ReturnsEmpty_WhenNoneRegistered()
+    {
+        var discovery = CreateDiscovery();
+
+        var commands = discovery.GetCommands().ToList();
+
+        Assert.Empty(commands);
+    }
+
+    [Fact]
+    public void FindCommand_ByName_ReturnsCorrectMeta()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object), typeof(CreatePersonResult));
+        var discovery = CreateDiscovery(meta);
+
+        var found = discovery.FindCommand("CreatePerson");
+
+        Assert.NotNull(found);
+        Assert.Equal(typeof(CreatePersonCommand), found.CommandType);
+    }
+
+    [Fact]
+    public void FindCommand_ByName_ReturnsNull_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        var found = discovery.FindCommand("NonExistent");
+
+        Assert.Null(found);
+    }
+
+    [Fact]
+    public void FindCommand_ByType_ReturnsCorrectMeta()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object), typeof(CreatePersonResult));
+        var discovery = CreateDiscovery(meta);
+
+        var found = discovery.FindCommand(typeof(CreatePersonCommand));
+
+        Assert.NotNull(found);
+        Assert.Equal("CreatePerson", found.Name);
+    }
+
+    [Fact]
+    public void FindCommand_ByType_ReturnsNull_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        var found = discovery.FindCommand(typeof(CreatePersonCommand));
+
+        Assert.Null(found);
+    }
+
+    [Fact]
+    public void CommandExists_ByName_ReturnsTrue_WhenFound()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object));
+        var discovery = CreateDiscovery(meta);
+
+        Assert.True(discovery.CommandExists("CreatePerson"));
+    }
+
+    [Fact]
+    public void CommandExists_ByName_ReturnsFalse_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        Assert.False(discovery.CommandExists("CreatePerson"));
+    }
+
+    [Fact]
+    public void CommandExists_ByType_ReturnsTrue_WhenFound()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object));
+        var discovery = CreateDiscovery(meta);
+
+        Assert.True(discovery.CommandExists(typeof(CreatePersonCommand)));
+    }
+
+    [Fact]
+    public void CommandExists_ByType_ReturnsFalse_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        Assert.False(discovery.CommandExists(typeof(CreatePersonCommand)));
+    }
+
+    [Fact]
+    public void FindCommand_WithCustomName_FindsByAttributeName()
+    {
+        var meta = new CommandMeta(typeof(CreateWidgetCommand), typeof(object));
+        var discovery = CreateDiscovery(meta);
+
+        var found = discovery.FindCommand("customCreate");
+
+        Assert.NotNull(found);
+        Assert.Equal(typeof(CreateWidgetCommand), found.CommandType);
+    }
+}

tests/Svrnty.CQRS.Tests/CommandMetaTests.cs

@@ -0,0 +1,64 @@
+using Svrnty.CQRS.Abstractions.Discovery;
+
+namespace Svrnty.CQRS.Tests;
+
+public class CommandMetaTests
+{
+    [Fact]
+    public void Name_StripsCommandSuffix()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object));
+        Assert.Equal("CreatePerson", meta.Name);
+    }
+
+    [Fact]
+    public void Name_UsesCommandNameAttribute_WhenPresent()
+    {
+        var meta = new CommandMeta(typeof(CreateWidgetCommand), typeof(object));
+        Assert.Equal("customCreate", meta.Name);
+    }
+
+    [Fact]
+    public void LowerCamelCaseName_ConvertsFirstCharToLower()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object));
+        Assert.Equal("createPerson", meta.LowerCamelCaseName);
+    }
+
+    [Fact]
+    public void LowerCamelCaseName_PreservesAlreadyLowerCase()
+    {
+        var meta = new CommandMeta(typeof(CreateWidgetCommand), typeof(object));
+        // customCreate -> already lower first char
+        Assert.Equal("customCreate", meta.LowerCamelCaseName);
+    }
+
+    [Fact]
+    public void CommandType_IsSetCorrectly()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object));
+        Assert.Equal(typeof(CreatePersonCommand), meta.CommandType);
+    }
+
+    [Fact]
+    public void ServiceType_IsSetCorrectly()
+    {
+        var serviceType = typeof(object);
+        var meta = new CommandMeta(typeof(CreatePersonCommand), serviceType);
+        Assert.Equal(serviceType, meta.ServiceType);
+    }
+
+    [Fact]
+    public void CommandResultType_IsSetCorrectly_WithThreeArgConstructor()
+    {
+        var meta = new CommandMeta(typeof(CreatePersonCommand), typeof(object), typeof(CreatePersonResult));
+        Assert.Equal(typeof(CreatePersonResult), meta.CommandResultType);
+    }
+
+    [Fact]
+    public void CommandResultType_IsNull_WithTwoArgConstructor()
+    {
+        var meta = new CommandMeta(typeof(DeletePersonCommand), typeof(object));
+        Assert.Null(meta.CommandResultType);
+    }
+}

tests/Svrnty.CQRS.Tests/CqrsConfigurationTests.cs

@@ -0,0 +1,106 @@
+using Svrnty.CQRS.Configuration;
+
+namespace Svrnty.CQRS.Tests;
+
+public class CqrsConfigurationTests
+{
+    private class TestConfig
+    {
+        public string Value { get; set; } = string.Empty;
+    }
+
+    private class OtherConfig
+    {
+        public int Number { get; set; }
+    }
+
+    [Fact]
+    public void SetConfiguration_CanBeRetrieved()
+    {
+        var config = new CqrsConfiguration();
+        var testConfig = new TestConfig { Value = "hello" };
+
+        config.SetConfiguration(testConfig);
+
+        var retrieved = config.GetConfiguration<TestConfig>();
+        Assert.NotNull(retrieved);
+        Assert.Equal("hello", retrieved.Value);
+    }
+
+    [Fact]
+    public void GetConfiguration_ReturnsNull_WhenNotSet()
+    {
+        var config = new CqrsConfiguration();
+
+        var retrieved = config.GetConfiguration<TestConfig>();
+
+        Assert.Null(retrieved);
+    }
+
+    [Fact]
+    public void HasConfiguration_ReturnsTrue_WhenSet()
+    {
+        var config = new CqrsConfiguration();
+        config.SetConfiguration(new TestConfig());
+
+        Assert.True(config.HasConfiguration<TestConfig>());
+    }
+
+    [Fact]
+    public void HasConfiguration_ReturnsFalse_WhenNotSet()
+    {
+        var config = new CqrsConfiguration();
+
+        Assert.False(config.HasConfiguration<TestConfig>());
+    }
+
+    [Fact]
+    public void SetConfiguration_OverwritesPrevious()
+    {
+        var config = new CqrsConfiguration();
+        config.SetConfiguration(new TestConfig { Value = "first" });
+        config.SetConfiguration(new TestConfig { Value = "second" });
+
+        var retrieved = config.GetConfiguration<TestConfig>();
+        Assert.Equal("second", retrieved!.Value);
+    }
+
+    [Fact]
+    public void MultipleConfigTypes_AreIndependent()
+    {
+        var config = new CqrsConfiguration();
+        config.SetConfiguration(new TestConfig { Value = "test" });
+        config.SetConfiguration(new OtherConfig { Number = 42 });
+
+        Assert.Equal("test", config.GetConfiguration<TestConfig>()!.Value);
+        Assert.Equal(42, config.GetConfiguration<OtherConfig>()!.Number);
+    }
+
+    [Fact]
+    public void ExecuteMappingCallbacks_InvokesAllCallbacks()
+    {
+        var config = new CqrsConfiguration();
+        var callCount = 0;
+
+        config.AddMappingCallback(_ => callCount++);
+        config.AddMappingCallback(_ => callCount++);
+
+        config.ExecuteMappingCallbacks(new object());
+
+        Assert.Equal(2, callCount);
+    }
+
+    [Fact]
+    public void ExecuteMappingCallbacks_PassesAppObject()
+    {
+        var config = new CqrsConfiguration();
+        object? receivedApp = null;
+
+        config.AddMappingCallback(app => receivedApp = app);
+
+        var expected = new object();
+        config.ExecuteMappingCallbacks(expected);
+
+        Assert.Same(expected, receivedApp);
+    }
+}

tests/Svrnty.CQRS.Tests/Fakes.cs

@@ -0,0 +1,81 @@
+using Svrnty.CQRS.Abstractions;
+using Svrnty.CQRS.Abstractions.Attributes;
+
+namespace Svrnty.CQRS.Tests;
+
+// Commands
+public class CreatePersonCommand
+{
+    public string FirstName { get; set; } = string.Empty;
+    public string LastName { get; set; } = string.Empty;
+}
+
+public class DeletePersonCommand
+{
+    public int Id { get; set; }
+}
+
+[CommandName("customCreate")]
+public class CreateWidgetCommand
+{
+    public string Name { get; set; } = string.Empty;
+}
+
+// Command results
+public class CreatePersonResult
+{
+    public int Id { get; set; }
+}
+
+// Queries
+public class PersonQuery
+{
+    public string? NameFilter { get; set; }
+}
+
+[QueryName("customPersonLookup")]
+public class PersonLookupQuery
+{
+    public int Id { get; set; }
+}
+
+// Handlers
+public class CreatePersonCommandHandler : ICommandHandler<CreatePersonCommand, CreatePersonResult>
+{
+    public Task<CreatePersonResult> HandleAsync(CreatePersonCommand command, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(new CreatePersonResult { Id = 1 });
+    }
+}
+
+public class DeletePersonCommandHandler : ICommandHandler<DeletePersonCommand>
+{
+    public Task HandleAsync(DeletePersonCommand command, CancellationToken cancellationToken = default)
+    {
+        return Task.CompletedTask;
+    }
+}
+
+public class CreateWidgetCommandHandler : ICommandHandler<CreateWidgetCommand>
+{
+    public Task HandleAsync(CreateWidgetCommand command, CancellationToken cancellationToken = default)
+    {
+        return Task.CompletedTask;
+    }
+}
+
+public class PersonQueryHandler : IQueryHandler<PersonQuery, IEnumerable<string>>
+{
+    public Task<IEnumerable<string>> HandleAsync(PersonQuery query, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult<IEnumerable<string>>(["Alice", "Bob"]);
+    }
+}
+
+public class PersonLookupQueryHandler : IQueryHandler<PersonLookupQuery, string>
+{
+    public Task<string> HandleAsync(PersonLookupQuery query, CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult("Alice");
+    }
+}

tests/Svrnty.CQRS.Tests/GlobalUsings.cs

@@ -0,0 +1 @@
+global using Xunit;

tests/Svrnty.CQRS.Tests/HandlerTests.cs

@@ -0,0 +1,64 @@
+using Microsoft.Extensions.DependencyInjection;
+using Svrnty.CQRS.Abstractions;
+
+namespace Svrnty.CQRS.Tests;
+
+public class HandlerTests
+{
+    [Fact]
+    public async Task CommandHandler_WithResult_ExecutesCorrectly()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<CreatePersonCommand, CreatePersonResult, CreatePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetRequiredService<ICommandHandler<CreatePersonCommand, CreatePersonResult>>();
+
+        var result = await handler.HandleAsync(new CreatePersonCommand
+        {
+            FirstName = "John",
+            LastName = "Doe"
+        });
+
+        Assert.Equal(1, result.Id);
+    }
+
+    [Fact]
+    public async Task CommandHandler_WithoutResult_ExecutesWithoutException()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<DeletePersonCommand, DeletePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetRequiredService<ICommandHandler<DeletePersonCommand>>();
+
+        await handler.HandleAsync(new DeletePersonCommand { Id = 1 });
+    }
+
+    [Fact]
+    public async Task QueryHandler_ExecutesCorrectly()
+    {
+        var services = new ServiceCollection();
+        services.AddQuery<PersonQuery, IEnumerable<string>, PersonQueryHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetRequiredService<IQueryHandler<PersonQuery, IEnumerable<string>>>();
+
+        var result = await handler.HandleAsync(new PersonQuery());
+
+        Assert.Equal(["Alice", "Bob"], result);
+    }
+
+    [Fact]
+    public async Task CommandHandler_SupportsCancellationToken()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<DeletePersonCommand, DeletePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetRequiredService<ICommandHandler<DeletePersonCommand>>();
+
+        using var cts = new CancellationTokenSource();
+        await handler.HandleAsync(new DeletePersonCommand { Id = 1 }, cts.Token);
+    }
+}

tests/Svrnty.CQRS.Tests/QueryDiscoveryTests.cs

@@ -0,0 +1,124 @@
+using Svrnty.CQRS.Abstractions.Discovery;
+using Svrnty.CQRS.Discovery;
+
+namespace Svrnty.CQRS.Tests;
+
+public class QueryDiscoveryTests
+{
+    private static QueryDiscovery CreateDiscovery(params IQueryMeta[] metas)
+    {
+        return new QueryDiscovery(metas);
+    }
+
+    [Fact]
+    public void GetQueries_ReturnsAllRegistered()
+    {
+        var meta1 = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        var meta2 = new QueryMeta(typeof(PersonLookupQuery), typeof(object), typeof(string));
+        var discovery = CreateDiscovery(meta1, meta2);
+
+        var queries = discovery.GetQueries().ToList();
+
+        Assert.Equal(2, queries.Count);
+    }
+
+    [Fact]
+    public void GetQueries_ReturnsEmpty_WhenNoneRegistered()
+    {
+        var discovery = CreateDiscovery();
+
+        var queries = discovery.GetQueries().ToList();
+
+        Assert.Empty(queries);
+    }
+
+    [Fact]
+    public void FindQuery_ByName_ReturnsCorrectMeta()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        var discovery = CreateDiscovery(meta);
+
+        var found = discovery.FindQuery("Person");
+
+        Assert.NotNull(found);
+        Assert.Equal(typeof(PersonQuery), found.QueryType);
+    }
+
+    [Fact]
+    public void FindQuery_ByName_ReturnsNull_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        var found = discovery.FindQuery("NonExistent");
+
+        Assert.Null(found);
+    }
+
+    [Fact]
+    public void FindQuery_ByType_ReturnsCorrectMeta()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        var discovery = CreateDiscovery(meta);
+
+        var found = discovery.FindQuery(typeof(PersonQuery));
+
+        Assert.NotNull(found);
+        Assert.Equal("Person", found.Name);
+    }
+
+    [Fact]
+    public void FindQuery_ByType_ReturnsNull_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        var found = discovery.FindQuery(typeof(PersonQuery));
+
+        Assert.Null(found);
+    }
+
+    [Fact]
+    public void QueryExists_ByName_ReturnsTrue_WhenFound()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        var discovery = CreateDiscovery(meta);
+
+        Assert.True(discovery.QueryExists("Person"));
+    }
+
+    [Fact]
+    public void QueryExists_ByName_ReturnsFalse_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        Assert.False(discovery.QueryExists("Person"));
+    }
+
+    [Fact]
+    public void QueryExists_ByType_ReturnsTrue_WhenFound()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        var discovery = CreateDiscovery(meta);
+
+        Assert.True(discovery.QueryExists(typeof(PersonQuery)));
+    }
+
+    [Fact]
+    public void QueryExists_ByType_ReturnsFalse_WhenNotFound()
+    {
+        var discovery = CreateDiscovery();
+
+        Assert.False(discovery.QueryExists(typeof(PersonQuery)));
+    }
+
+    [Fact]
+    public void FindQuery_WithCustomName_FindsByAttributeName()
+    {
+        var meta = new QueryMeta(typeof(PersonLookupQuery), typeof(object), typeof(string));
+        var discovery = CreateDiscovery(meta);
+
+        var found = discovery.FindQuery("customPersonLookup");
+
+        Assert.NotNull(found);
+        Assert.Equal(typeof(PersonLookupQuery), found.QueryType);
+    }
+}

tests/Svrnty.CQRS.Tests/QueryMetaTests.cs

@@ -0,0 +1,57 @@
+using Svrnty.CQRS.Abstractions.Discovery;
+
+namespace Svrnty.CQRS.Tests;
+
+public class QueryMetaTests
+{
+    [Fact]
+    public void Name_StripsQuerySuffix()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        Assert.Equal("Person", meta.Name);
+    }
+
+    [Fact]
+    public void Name_UsesQueryNameAttribute_WhenPresent()
+    {
+        var meta = new QueryMeta(typeof(PersonLookupQuery), typeof(object), typeof(string));
+        Assert.Equal("customPersonLookup", meta.Name);
+    }
+
+    [Fact]
+    public void LowerCamelCaseName_ConvertsFirstCharToLower()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        Assert.Equal("person", meta.LowerCamelCaseName);
+    }
+
+    [Fact]
+    public void Category_DefaultsToBasicQuery()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        Assert.Equal("BasicQuery", meta.Category);
+    }
+
+    [Fact]
+    public void QueryType_IsSetCorrectly()
+    {
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), typeof(IEnumerable<string>));
+        Assert.Equal(typeof(PersonQuery), meta.QueryType);
+    }
+
+    [Fact]
+    public void ServiceType_IsSetCorrectly()
+    {
+        var serviceType = typeof(object);
+        var meta = new QueryMeta(typeof(PersonQuery), serviceType, typeof(IEnumerable<string>));
+        Assert.Equal(serviceType, meta.ServiceType);
+    }
+
+    [Fact]
+    public void QueryResultType_IsSetCorrectly()
+    {
+        var resultType = typeof(IEnumerable<string>);
+        var meta = new QueryMeta(typeof(PersonQuery), typeof(object), resultType);
+        Assert.Equal(resultType, meta.QueryResultType);
+    }
+}

tests/Svrnty.CQRS.Tests/ServiceRegistrationTests.cs

@@ -0,0 +1,180 @@
+using Microsoft.Extensions.DependencyInjection;
+using Svrnty.CQRS.Abstractions;
+using Svrnty.CQRS.Abstractions.Discovery;
+using Svrnty.CQRS.Discovery;
+
+namespace Svrnty.CQRS.Tests;
+
+public class ServiceRegistrationTests
+{
+    [Fact]
+    public void AddCommand_WithResult_RegistersHandlerInDI()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<CreatePersonCommand, CreatePersonResult, CreatePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetService<ICommandHandler<CreatePersonCommand, CreatePersonResult>>();
+
+        Assert.NotNull(handler);
+        Assert.IsType<CreatePersonCommandHandler>(handler);
+    }
+
+    [Fact]
+    public void AddCommand_WithResult_RegistersCommandMeta()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<CreatePersonCommand, CreatePersonResult, CreatePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var metas = provider.GetServices<ICommandMeta>().ToList();
+
+        Assert.Single(metas);
+        Assert.Equal(typeof(CreatePersonCommand), metas[0].CommandType);
+        Assert.Equal(typeof(CreatePersonResult), metas[0].CommandResultType);
+    }
+
+    [Fact]
+    public void AddCommand_WithoutResult_RegistersHandlerInDI()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<DeletePersonCommand, DeletePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetService<ICommandHandler<DeletePersonCommand>>();
+
+        Assert.NotNull(handler);
+        Assert.IsType<DeletePersonCommandHandler>(handler);
+    }
+
+    [Fact]
+    public void AddCommand_WithoutResult_RegistersCommandMeta()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<DeletePersonCommand, DeletePersonCommandHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var metas = provider.GetServices<ICommandMeta>().ToList();
+
+        Assert.Single(metas);
+        Assert.Equal(typeof(DeletePersonCommand), metas[0].CommandType);
+        Assert.Null(metas[0].CommandResultType);
+    }
+
+    [Fact]
+    public void AddQuery_RegistersHandlerInDI()
+    {
+        var services = new ServiceCollection();
+        services.AddQuery<PersonQuery, IEnumerable<string>, PersonQueryHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var handler = provider.GetService<IQueryHandler<PersonQuery, IEnumerable<string>>>();
+
+        Assert.NotNull(handler);
+        Assert.IsType<PersonQueryHandler>(handler);
+    }
+
+    [Fact]
+    public void AddQuery_RegistersQueryMeta()
+    {
+        var services = new ServiceCollection();
+        services.AddQuery<PersonQuery, IEnumerable<string>, PersonQueryHandler>();
+
+        var provider = services.BuildServiceProvider();
+        var metas = provider.GetServices<IQueryMeta>().ToList();
+
+        Assert.Single(metas);
+        Assert.Equal(typeof(PersonQuery), metas[0].QueryType);
+        Assert.Equal(typeof(IEnumerable<string>), metas[0].QueryResultType);
+    }
+
+    [Fact]
+    public void AddDefaultCommandDiscovery_RegistersCommandDiscovery()
+    {
+        var services = new ServiceCollection();
+        services.AddDefaultCommandDiscovery();
+
+        var provider = services.BuildServiceProvider();
+        var discovery = provider.GetService<ICommandDiscovery>();
+
+        Assert.NotNull(discovery);
+        Assert.IsType<CommandDiscovery>(discovery);
+    }
+
+    [Fact]
+    public void AddDefaultQueryDiscovery_RegistersQueryDiscovery()
+    {
+        var services = new ServiceCollection();
+        services.AddDefaultQueryDiscovery();
+
+        var provider = services.BuildServiceProvider();
+        var discovery = provider.GetService<IQueryDiscovery>();
+
+        Assert.NotNull(discovery);
+        Assert.IsType<QueryDiscovery>(discovery);
+    }
+
+    [Fact]
+    public void FullPipeline_DiscoveryFindsRegisteredCommands()
+    {
+        var services = new ServiceCollection();
+        services.AddCommand<CreatePersonCommand, CreatePersonResult, CreatePersonCommandHandler>();
+        services.AddCommand<DeletePersonCommand, DeletePersonCommandHandler>();
+        services.AddDefaultCommandDiscovery();
+
+        var provider = services.BuildServiceProvider();
+        var discovery = provider.GetRequiredService<ICommandDiscovery>();
+
+        Assert.Equal(2, discovery.GetCommands().Count());
+        Assert.True(discovery.CommandExists("CreatePerson"));
+        Assert.True(discovery.CommandExists("DeletePerson"));
+    }
+
+    [Fact]
+    public void FullPipeline_DiscoveryFindsRegisteredQueries()
+    {
+        var services = new ServiceCollection();
+        services.AddQuery<PersonQuery, IEnumerable<string>, PersonQueryHandler>();
+        services.AddQuery<PersonLookupQuery, string, PersonLookupQueryHandler>();
+        services.AddDefaultQueryDiscovery();
+
+        var provider = services.BuildServiceProvider();
+        var discovery = provider.GetRequiredService<IQueryDiscovery>();
+
+        Assert.Equal(2, discovery.GetQueries().Count());
+        Assert.True(discovery.QueryExists("Person"));
+        Assert.True(discovery.QueryExists("customPersonLookup"));
+    }
+
+    [Fact]
+    public void AddSvrntyCqrs_RegistersDiscoveryServices()
+    {
+        var services = new ServiceCollection();
+        services.AddSvrntyCqrs();
+
+        var provider = services.BuildServiceProvider();
+
+        Assert.NotNull(provider.GetService<ICommandDiscovery>());
+        Assert.NotNull(provider.GetService<IQueryDiscovery>());
+    }
+
+    [Fact]
+    public void AddSvrntyCqrs_WithFluentBuilder_RegistersCommandsAndQueries()
+    {
+        var services = new ServiceCollection();
+        services.AddSvrntyCqrs(builder =>
+        {
+            builder
+                .AddCommand<CreatePersonCommand, CreatePersonResult, CreatePersonCommandHandler>()
+                .AddCommand<DeletePersonCommand, DeletePersonCommandHandler>()
+                .AddQuery<PersonQuery, IEnumerable<string>, PersonQueryHandler>();
+        });
+
+        var provider = services.BuildServiceProvider();
+        var cmdDiscovery = provider.GetRequiredService<ICommandDiscovery>();
+        var qryDiscovery = provider.GetRequiredService<IQueryDiscovery>();
+
+        Assert.Equal(2, cmdDiscovery.GetCommands().Count());
+        Assert.Single(qryDiscovery.GetQueries());
+    }
+}

tests/Svrnty.CQRS.Tests/Svrnty.CQRS.Tests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>14</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.*" />
+    <PackageReference Include="xunit" Version="2.*" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.*">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.0-*" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Svrnty.CQRS\Svrnty.CQRS.csproj" />
+    <ProjectReference Include="..\..\Svrnty.CQRS.Abstractions\Svrnty.CQRS.Abstractions.csproj" />
+  </ItemGroup>
+
+</Project>