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 DoNotRunIfHasRuleViolation_ShouldRunClauseAdded()
{
var rule = new Rule ( "Rule1" );
var ruleBuilder = new RuleBuilder<RuleEngineContext<Customer>, Customer> ( rule );
ruleBuilder.DoNotRunIfHasRuleViolation ();
var ruleEngineContext = new RuleEngineContext ( new Customer () );
ruleEngineContext.RuleViolationReporter.Report ( new RuleViolation ( rule, null, null ) );
var shouldRunResult = rule.ShouldRunRule ( ruleEngineContext );
Assert.IsFalse ( shouldRunResult );
}
public void Then_ProvidingAThenClauseOverrideToTheBuilder_RuleShouldHaveAThenClauseOverride()
{
var rule = new Rule ( "Rule1" );
var ruleBuilder = new RuleBuilder<RuleEngineContext<Customer>, Customer> ( rule );
ruleBuilder.When ( ( cust, ctxt ) => true ).Then ( ( cust, ctxt ) => cust.Age++ );
var customer = new Customer { Age = 10 };
var context = new RuleEngineContext<Customer> ( customer );
foreach ( var clause in rule.ThenClauses )
{
clause ( context );
}
Assert.AreEqual ( 11, customer.Age );
}
public void Rule_WithThenClauses_ThenClausesAreCallable()
{
var customer = new Customer ();
var ruleEngineContext = new RuleEngineContext<Customer> ( customer );
var rule = new Rule ( "Name" );
Action<IRuleEngineContext> thenClause1 = e => ( ( Customer )e.Subject ).Age = 20;
rule.AddThenClause ( thenClause1 );
Action<IRuleEngineContext> thenClause2 = e => ( ( Customer )e.Subject ).Age++;
rule.AddThenClause ( thenClause2 );
foreach ( var clause in rule.ThenClauses )
{
clause ( ruleEngineContext );
}
Assert.AreEqual ( 21, customer.Age );
}
public void Rule_WithName_RuleIsNamed()
{
var rule = new Rule ( "Name" );
Assert.AreEqual ( "Name", rule.Name );
}
public void WithPrioroty_RulePriorityIsSet()
{
var rule = new Rule ( "Rule1" );
var ruleBuilder = new RuleBuilder<RuleEngineContext<Customer>, Customer> ( rule );
ruleBuilder.WithPriority ( 5 );
Assert.AreEqual ( 5, rule.Priority );
}
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 );
}
public void When_GivenAThenClauseWithoutAWhenClause_ThrowsInvalidRuleException()
{
var rule = new Rule ( "Rule1" );
var ruleBuilder = new RuleBuilder<RuleEngineContext<Customer>, Customer> ( rule );
ruleBuilder.Then ( c => c.Age++ );
}
