public void FunctionalLifeSpanTest_ShouldProduceDesiredResults()
{
// Arrange.
var firstTerm = 3d;
var commonRatio = 2d;
// Act.
var target = new GeometricSequence(firstTerm, commonRatio);
// Assert.
target.CalculatedTermCount.Should().Be(1);
target[0].Should().Be(firstTerm);
target[1].Should().Be(6);
target[2].Should().Be(12);
target[3].Should().Be(24);
target[4].Should().Be(48);
target.CalculatedTermCount.Should().Be(5);
target[5].Should().Be(96);
target[6].Should().Be(192);
target[7].Should().Be(384);
target[8].Should().Be(768);
target[9].Should().Be(1536);
target.CalculatedTermCount.Should().Be(10);
target.Reset();
target.CalculatedTermCount.Should().Be(1);
target[0].Should().Be(firstTerm);
target[1].Should().Be(6);
target[2].Should().Be(12);
}
public void Constructor_ShouldRaiseArgumentOutOfRangeException_ForZeroCommonRatioArgument()
{
// Arrange.
var firstTerm = 3d;
var commonRatio = 0d;
// Act.
var action = new Action(() =>
{
var target = new GeometricSequence(firstTerm, commonRatio);
});
// Assert.
action.Should().Throw <ArgumentOutOfRangeException>();
}
public void GeometricSequence()
{
var g1 = new GeometricSequence
{
InitialTerm = 2,
CommonRatio = 3
};
Assert.AreEqual(486, g1.NTerm(5));
var g2 = new GeometricSequence
{
InitialTerm = 2,
CommonRatio = 0.5
};
Assert.AreEqual(4, g2.InfiniteSum());
}
