public async Task CanSaveOrUpdate()
{
var entity = new Contractor
{
Name = "John Doe"
};
var res = await _repo.SaveOrUpdateAsync(entity).ConfigureAwait(false);
res.IsTransient().Should().BeFalse();
entity.Name = "John Doe Jr";
res = await _repo.SaveOrUpdateAsync(entity).ConfigureAwait(false);
res.Name.Should().Be("John Doe Jr");
}