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using Org.Apache.REEF.IMRU.Examples.NaturalSum;
using Org.Apache.REEF.IMRU.InProcess;
using Org.Apache.REEF.Tang.Implementations.Tang;
using Xunit;

namespace Org.Apache.REEF.IMRU.Tests
{
    /// <summary>
    /// Tests of the natural sum job.
    /// </summary>
    public class NaturalSumTest
    {
        private const int NumberOfMappers = 7;

        /// <summary>
        /// Tests the natural sum job using the in-process IMRU implementation.
        /// </summary>
        [Fact]
        public void TestNaturalSumInProcess()
        {
            var naturalSumJob =
                TangFactory.GetTang()
                    .NewInjector(
                        InProcessIMRUConfiguration.ConfigurationModule
                            .Set(InProcessIMRUConfiguration.NumberOfMappers, NumberOfMappers.ToString())
                            .Build())
                    .GetInstance<NaturalSum>();
            var result = naturalSumJob.Run(NumberOfMappers, string.Empty, TangFactory.GetTang().NewConfigurationBuilder().Build());
            var expected = NumberOfMappers * (NumberOfMappers + 1) / 2; // expected = 1 + 2 + ... + NumberOfMappers
            Assert.True(expected == result, string.Format("The result of the run should be {0} but was {1}.", expected, result));
        }
    }
}