LINQ3.cs

[TestFixture]
public class SumNumbersTests
{
  [Test]
  public void ShouldAddAllValuesUsingForeach()
  {
    var sum = new SumNumbers();
    Assert.AreEqual(63, sum.SumUsingForeach());
  }

  [Test]
  public void ShouldAddAllValuesUsingLinqExpression()
  {
    var sum = new SumNumbers();
    Assert.AreEqual(63, sum.SumUsingLinq());
  }

  [Test]
  public void LinqExpressionAndForeachSumShouldBeEqual()
  {
    var sum = new SumNumbers();
    Assert.AreEqual(sum.SumUsingForeach(), sum.SumUsingLinq());
  }
}