public void Constructor_RandIsSet()
        {
            IRandomExtensions rand = Mock.Of<IRandomExtensions>();
            var target = new RandomInt64DataSource(rand);

            Assert.AreEqual(rand, target.Random, "The Random Property was not set properly.");
        }
        public void Next()
        {
            Mock<IRandomExtensions> randMock = new Mock<IRandomExtensions>();
            var target = new RandomInt64DataSource(randMock.Object);
            target.Next(null);

            randMock.Verify(a => a.GetInt64(System.Int64.MinValue, System.Int64.MaxValue), @"
            The GetInt64 method on the IRandomExtensions object was not called.
            ");
        }