dotnet add package Testcontainers.CosmosDb

public class CandidateRepositoryTests : IAsyncLifetime
{
    private readonly CosmosDbContainer _container = new CosmosDbBuilder().Build();

    public async Task InitializeAsync() => await _container.StartAsync();
    public async Task DisposeAsync() => await _container.DisposeAsync();

    [Fact]
    public async Task Create_ValidCandidate_Persists()
    {
        var client = new CosmosClient(_container.GetConnectionString());
        var repo = new CandidateRepository(client, Options.Create(settings));
        var candidate = CreateTestCandidate();
        await repo.CreateAsync(candidate);
        var result = await repo.GetByIdAsync(candidate.Id);
        result.Should().BeEquivalentTo(candidate);
    }
}