abp/test/Volo.Abp.Tests/AbpApplication_Tests.cs

using Microsoft.Extensions.DependencyInjection;
using Shouldly;
using Volo.Abp;
using Volo.Abp.Modularity;
using Xunit;

public class AbpApplication_Tests
{
    [Fact]
    public void Should_Initialize_SingleModule_Application()
    {
        //Arrange

        var services = new ServiceCollection();

        using (var application = AbpApplication.Create<IndependentEmptyModule>(services))
        {
            //Act

            application.Initialize(services.BuildServiceProvider());

            //Assert

            var module = application.ServiceProvider.GetRequiredService<IndependentEmptyModule>();
            module.ConfigureServicesIsCalled.ShouldBeTrue();
            module.OnApplicationInitializeIsCalled.ShouldBeTrue();
        }
    }
}