proposal-system/api/tests/ProposalSystem.Tests/Helpers/DbContextFactory.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;
using ProposalSystem.Infrastructure.Data;

namespace ProposalSystem.Tests.Helpers;

/// <summary>
/// Creates isolated in-memory DbContext instances for unit tests.
/// Each call produces a uniquely-named database so tests don't leak state.
/// Transaction warnings are suppressed since InMemory provider does not support them.
/// </summary>
public static class DbContextFactory
{
    public static ProposalDbContext Create()
    {
        var options = new DbContextOptionsBuilder<ProposalDbContext>()
            .UseInMemoryDatabase(databaseName: $"TestDb_{Guid.NewGuid()}")
            .ConfigureWarnings(w => w.Ignore(InMemoryEventId.TransactionIgnoredWarning))
            .Options;

        var context = new ProposalDbContext(options);
        context.Database.EnsureCreated();
        return context;
    }
}