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VisaApiTests/Tests/Infrastructure/Database/Repositories/Generic/GenericRepositoryTests.cs

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+using ApplicationLayer.GeneralExceptions;
+using Domains.Users;
+using FluentAssertions;
+using Infrastructure.Database;
+using Infrastructure.Database.Generic;
+using Xunit;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories.Generic;
+
+[Collection(Collections.ContextUsingTestCollection)]
+public class GenericRepositoryTests
+{
+    /// <summary> Returns <see cref="GenericRepository{T}"/> </summary>
+    /// <param name="context"> Database context </param>
+    /// <returns>Repository</returns>
+    private static GenericRepository<User> GetRepository(DatabaseContext context) => new TestGenericRepository(context, context);
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetAllAsync"/> method that should return empty collection if nothing added </summary>
+    [Fact]
+    public void GetAllForEmptyShouldReturnEmpty()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+
+        var result = repository.GetAllAsync(CancellationToken.None).Result;
+
+        result.Should().BeEmpty();
+    }
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetAllAsync"/> method that should return collection with added entities </summary>
+    [Fact]
+    public void GetAllForNotEmptyShouldReturnEntities()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+        User[] users =
+        [
+            new() { Email = "nasrudin@mail.ru", Password = "12345", Role = Role.Admin },
+            new() { Email = "bruh@mail.ru", Password = "123", Role = Role.Applicant }
+        ];
+        foreach (var user in users)
+        {
+            repository.AddAsync(user, CancellationToken.None).Wait();
+        }
+
+        context.SaveChanges();
+
+        var result = repository.GetAllAsync(CancellationToken.None).Result;
+
+        result.Should().Contain(users).And.HaveSameCount(users);
+    }
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetByIdAsync"/> method that should return existing entity </summary>
+    [Fact]
+    public void GetByIdForExistingShouldReturnEntity()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+        var user = new User { Email = "nasrudin@mail.ru", Password = "12345", Role = Role.Admin };
+        repository.AddAsync(user, CancellationToken.None).Wait();
+
+        context.SaveChanges();
+
+        var result = repository.GetByIdAsync(user.Id, CancellationToken.None).Result;
+
+        result.Should().Be(user);
+    }
+
+    /// <summary> Test for <see cref="GenericRepository{T}.GetByIdAsync"/> method that should throw exception for not found entity </summary>
+    [Fact]
+    public void GetByIdForNotExistingShouldThrow()
+    {
+        using var context = InMemoryContextProvider.GetDbContext();
+        var repository = GetRepository(context);
+
+        context.SaveChanges();
+
+        EntityNotFoundByIdException<User>? result = null;
+        try
+        {
+            repository.GetByIdAsync(Guid.NewGuid(), CancellationToken.None).Wait();
+        }
+        catch (AggregateException e)
+        {
+            result = e.InnerException as EntityNotFoundByIdException<User>;
+        }
+
+        result.Should().NotBeNull();
+    }
+}

VisaApiTests/Tests/Infrastructure/Database/Repositories/Generic/TestGenericRepository.cs

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+using Domains.Users;
+using Infrastructure.Database.Generic;
+
+namespace VisaApi.Tests.Infrastructure.Database.Repositories.Generic;
+
+public class TestGenericRepository(IGenericReader reader, IGenericWriter writer) : GenericRepository<User>(reader, writer);