public void Evaluate_GivenNullNegative_Throws()
{
// GIVEN
var positiveDecision = new Mock <Decision <EmployeeInfo, BonusCalculation> >();
var decisionQuery = new DecisionQuery <EmployeeInfo, BonusCalculation>
{
Test = _ => true,
Positive = positiveDecision.Object,
Negative = null
};
var input = new EmployeeInfo();
// WHEN THEN
Assert.Throws <DecisionException>(() => decisionQuery.Evaluate(input), "'Positive' cannot be null");
}
public void Evaluate_GivenNegativeTest_EvaluatesNegative()
{
// GIVEN
var positiveDecision = new Mock <Decision <EmployeeInfo, BonusCalculation> >();
var negativeDecision = new Mock <Decision <EmployeeInfo, BonusCalculation> >();
var decisionQuery = new DecisionQuery <EmployeeInfo, BonusCalculation>
{
Test = _ => false,
Positive = positiveDecision.Object,
Negative = negativeDecision.Object
};
var input = new EmployeeInfo();
// WHEN
decisionQuery.Evaluate(input);
// THEN
positiveDecision.Verify(decision => decision.Evaluate(input), Times.Never);
negativeDecision.Verify(decision => decision.Evaluate(input), Times.Once);
}
public IEnumerable <Activity> Evaluate(Activity activity)
{
return(_entryPoint.Evaluate(activity));
}
static void MainDecisionTrees()
{
// The tree is constructed from a query
var tree =
new DecisionQuery
{
Title = "More than $40k",
// Test is specified using a lambda function
Test = (client) => client.Income > 40000,
// Sub-trees can be 'DecisionResult' or 'DecisionQuery'
Positive = new DecisionResult { Result = true },
Negative = new DecisionResult { Result = false }
};
// Test a client using this tree
// Create client using object initializer
var john = new Client {
Name = "John Doe", Income = 40000, YearsInJob = 1,
UsesCreditCard = true, CriminalRecord = false
};
tree.Evaluate(john);
}