dotnet-cqrs/tests/Svrnty.CQRS.Tests/CommandDiscoveryTests.cs

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);
    }
}