public async Task ChangeEmailWithNullEmail()
{
ApplicationDbContext dbContext = new ApplicationDbContext(new DbContextOptionsBuilder <ApplicationDbContext>()
.UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options);
var service = new EmployeesService(new EfDeletableEntityRepository <Employee>(dbContext));
var date = DateTime.UtcNow;
await service.AddAsync(
"Ivan Ivanov",
"*****@*****.**",
"08888888888",
date,
"1");
var employee = await dbContext.Employees.FirstOrDefaultAsync();
await service.ChangeEmailAsync(employee.Id, null);
var result = await dbContext.Employees.FirstOrDefaultAsync();
Assert.Equal(employee.Email, result.Email);
dbContext.Database.EnsureDeleted();
}