abp/modules/docs/test/Volo.Docs.Application.Tests/Volo/Docs/DocsApplicationTestModule.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using NSubstitute;
using Volo.Abp.Modularity;

namespace Volo.Docs
{
    [DependsOn(
        typeof(DocsApplicationModule),
        typeof(DocsDomainTestModule)
        )]
    public class DocsApplicationTestModule : AbpModule
    {
        public override void ConfigureServices(ServiceConfigurationContext context)
        {
            var hostEnvironment = Substitute.For<IHostEnvironment>();
            hostEnvironment.EnvironmentName.Returns(Environments.Production);
            context.Services.AddSingleton(hostEnvironment);
        }
    }
}