DD.WellWorkover.Cloud/AsbCloudWebApi.Tests/TestHelpter.cs

using AsbCloudDb.Model;
using Microsoft.EntityFrameworkCore;
using Moq;
using System.Collections.Generic;
using System.Linq;

namespace AsbCloudWebApi.Tests
{
    internal static class TestHelpter
    {
        // Попробовать когда-нибудь https://github.com/MichalJankowskii/Moq.EntityFrameworkCore

        public static AsbCloudDbContext MakeRealTestContext()
        {
            var options = new DbContextOptionsBuilder<AsbCloudDbContext>()
                //.UseInMemoryDatabase(System.Guid.NewGuid().ToString())
                //.ConfigureWarnings(configBuilder => 
                //    configBuilder.Ignore(InMemoryEventId.TransactionIgnoredWarning))
                .UseNpgsql("Host=localhost;Database=tests;Username=postgres;Password=q;Persist Security Info=True;Include Error Detail=True")
                .Options;
            var context = new AsbCloudDbContext(options);
            //context.Database.EnsureDeleted();
            context.Database.EnsureCreated();
            return context;
        }

        public static Mock<IAsbCloudDbContext> AddDbSetMock<T>(this Mock<IAsbCloudDbContext> contextMock, IEnumerable<T> dbSetData)
            where T : class
        {
            var dbSetMock = MakeDbSetMock(dbSetData);
            contextMock.Setup(o => o.Set<T>())
                .Returns(() => dbSetMock.Object);

            return contextMock;
        }

        public static Mock<DbSet<T>> MakeDbSetMock<T>()
            where T : class
        {
            var dbSetData = new List<T>();
            return MakeDbSetMock(dbSetData);
        }

        public static Mock<DbSet<T>> MakeDbSetMock<T>(IEnumerable<T> dbSetData)
            where T : class
        {
            var dbSetDataQueriable = dbSetData
                .ToList()
                .AsQueryable();

            Mock<DbSet<T>> dbSetMock = new();
            dbSetMock.As<IQueryable<T>>().Setup(o => o.Provider).Returns(() => dbSetDataQueriable.Provider);
            dbSetMock.As<IQueryable<T>>().Setup(o => o.Expression).Returns(() => dbSetDataQueriable.Expression);
            dbSetMock.As<IQueryable<T>>().Setup(o => o.ElementType).Returns(() => dbSetDataQueriable.ElementType);
            dbSetMock.As<IQueryable<T>>().Setup(o => o.GetEnumerator()).Returns(() => dbSetDataQueriable.GetEnumerator());

            return dbSetMock;
        }
    }
}