/Framework/src/Ncqrs.Tests/BasicGuidGeneratorSpecs.cs

using System;

using FluentAssertions;

using System.Collections.Generic;

using Xunit;



namespace Ncqrs.Tests

{

    public class BasicGuidGeneratorSpecs

    {

        [Fact]

        public void When_getting_a_new_identifier_it_should_not_be_empty()

        {

            var generator = new BasicGuidGenerator();



            var newIdentifier = generator.GenerateNewId();



            newIdentifier.Should().NotBe(Guid.Empty);

        }



        [Fact]

        public void When_getting_a_new_identifier_twice_they_should_not_be_the_same()

        {

            var generator = new BasicGuidGenerator();



            var firstIdentifier = generator.GenerateNewId();

            var secondIdentifier = generator.GenerateNewId();



            firstIdentifier.Should().NotBe(secondIdentifier);

        }



        [Fact]

        public void When_getting_a_new_identifier_multiple_times_they_should_all_be_unique()

        {

            var generator = new BasicGuidGenerator();

            var identifiers = new HashSet<Guid>();



            for (int i = 0; i < 500; i++)

            {

                var newId = generator.GenerateNewId();



                identifiers.Should().NotContain(newId);



                identifiers.Add(newId);

            }

        }

    }

}