public void TestGoalSeek([Values(1700, 1400, 1300)] decimal target)
{
// Given
var tree = GetTree();
var goalSeek = new GoalSeek <GoalSeekContext>(() => new GoalSeekContext(0, target), tree, ModifyContext, GetTarget, GetStartValue);
// When
var result = goalSeek.GetGoalSeekValue(target);
var executionTine = goalSeek.GetExecutionTine();
var iterations = goalSeek.GetIterations();
// Then
var context = new GoalSeekContext(result, target);
tree.Run(context);
Assert.IsNotNull(context);
var grossUp = (long)(context.TargetDecimal - context.Tax + context.DecimalToManipulate);
Assert.AreEqual(target, grossUp);
Assert.IsNotNull(iterations);
Assert.IsNotNull(executionTine);
}
/// <summary>
/// Modify the variable in the context
/// </summary>
/// <param name="context">
/// The context.
/// </param>
/// <param name="input">
/// The input.
/// </param>
/// <returns>
/// The <see cref="GoalSeekContext"/>.
/// </returns>
private static GoalSeekContext ModifyContext(GoalSeekContext context, decimal input)
{
context.DecimalToManipulate = input;
return(context);
}
/// <summary>
/// The get start value.
/// </summary>
/// <param name="context">
/// The context.
/// </param>
/// <returns>
/// The <see cref="decimal"/>.
/// </returns>
private static decimal GetStartValue(GoalSeekContext context)
{
return(context.Tax);
}
/// <summary>
/// Get the target
/// </summary>
/// <param name="context">
/// The context from which to retrieve the target
/// </param>
/// <returns>
/// The <see cref="decimal"/>.
/// </returns>
private static decimal GetTarget(GoalSeekContext context)
{
return(context.TargetDecimal);
}