public void Rule_WithWhenClause_WhenClauseIsCallable()
{
var customer = new Customer ();
var ruleEngineContext = new RuleEngineContext<Customer> ( customer );
Predicate<IRuleEngineContext> whenClause = e => string.IsNullOrWhiteSpace ( ( ( RuleEngineContext<Customer> )e ).Subject.FirstName );
var rule = new Rule ( "Name" ) { WhenClause = whenClause };
var isNullOrWhiteSpace = rule.WhenClause ( ruleEngineContext );
Assert.IsTrue ( isNullOrWhiteSpace );
}
public void When_WithAWhenFunction_AssignsWhenFunctionToRule()
{
var rule = new Rule ( "Rule1" );
var ruleBuilder = new RuleBuilder<RuleEngineContext<Customer>, Customer> ( rule );
ruleBuilder.When ( ( cust, ctxt ) => cust.Age < 20 );
var customer = new Customer { Age = 10 };
var context = new RuleEngineContext<Customer> ( customer );
var lessThan20 = rule.WhenClause ( context );
Assert.IsTrue ( lessThan20 );
}
public void When_GivenAWhenPredicate_AssignsWhenPredicateToRule()
{
var rule = new Rule ( "Rule1" );
var ruleBuilder = new RuleBuilder<RuleEngineContext<Customer>, Customer> ( rule );
ruleBuilder.When ( c => c.Age < 20 );
var customer = new Customer { Age = 10 };
var context = new RuleEngineContext<Customer> ( customer );
var lessThan20 = rule.WhenClause ( context );
Assert.IsTrue ( lessThan20 );
}