Musify/backend/Tests/Musify.Application.Tests/Users/UnfollowUserCommandHandlerTests.cs

using Microsoft.EntityFrameworkCore;
using Musify.Application.Tests.TestSupport;
using Musify.Application.Users;
using Musify.Domain.Entities;
using Xunit;

namespace Musify.Application.Tests.Users
{
    public sealed class UnfollowUserCommandHandlerTests : HandlerTestBase
    {
        private UnfollowUserCommandHandler CreateHandler() => new(Database, NoOpLogger<UnfollowUserCommandHandler>());

        [Fact]
        public async Task Handle_ExistingFollow_RemovesIt()
        {
            var follower = TestEntities.User(1, "follower");
            var followed = TestEntities.User(2, "followed");
            await SeedAsync(follower, followed, new UserFollow { FollowerId = follower.Id, FollowedId = followed.Id });

            var result = await CreateHandler().Handle(new UnfollowUserCommand(follower.Id, followed.Id), TestContext.Current.CancellationToken);

            Assert.False(result.IsError);
            Assert.Empty(await Database.UserFollows.ToListAsync(TestContext.Current.CancellationToken));
        }

        [Fact]
        public async Task Handle_NotFollowing_IsIdempotent()
        {
            var follower = TestEntities.User(1, "follower");
            var followed = TestEntities.User(2, "followed");
            await SeedAsync(follower, followed);

            var result = await CreateHandler().Handle(new UnfollowUserCommand(follower.Id, followed.Id), TestContext.Current.CancellationToken);

            Assert.False(result.IsError);
        }
    }
}