Building Enterprise Services with Drools Rule Engine
Pages: 1, 2, 3, 4, 5

We start by writing a basic JUnit test that contains two test methods: testSuccessfulApplication() simulates a successful loan application and testAllFeedbackMessages() simulates a failed loan application and displays all the feedback messages.

public class TestUnderwritingService extends TestCase {

    public void testSuccessfulApplication() throws Exception{
        Borrower bo = new Borrower();
        bo.setAge(40);
        bo.setGrossIncome(290000.0);

        // Call the CreditScore Service to fill the credit score
        CreditScoringService css = new CreditScoringService();
        css.setScore(700); // Value hard-coded for testing purpose
        css.getScore(bo);

        // Call the affordability model service
        AffordabilityModelService ams = new AffordabilityModelService();
        ams.runModel(bo);

        Property po = new Property();
        po.setPurpose(Flag.OWNER_OCCUPIED);
        po.setYearBuilt(2003);
        po.setZipCode("22102");

        // Call the PropertyValue service
        PropertyValuationService pvs = new PropertyValuationService();
        pvs.setPropertyValue(800000.0); // hard-coded for testing
        pvs.getPropertyValue(po);

        // Create a Loan Application
        LoanApplication la = new LoanApplication();
        la.setBorrower(bo);
        la.setProperty(po);
        la.setLoanAmount(390000.0);
        la.setLoanToValueRatio(la.getLoanAmount()/po.getValue()*100);

        // Calls the underwriting service
        UnderwritingService ue = new UnderwritingService();
        ue.evaluate(la);

        System.out.println("\nTesting successful application");
        System.out.println("=============================");
        System.out.println(la);
        System.out.println("Feedback message size=" +
                                la.getFeedbackMsgSize());
        System.out.println("Affordability Flag=" + 
                                la.getAffordabilityFlag());
        System.out.println("Underwriting Decision=" + 
                                la.getStatus());

        //assertEquals(la.getStatus(), LoanApplication.PASSED);
        assertEquals(la.getStatus(), Flag.PASSED);

    }

    public void testAllFeedbackMessages() throws Exception{
        Borrower bo = new Borrower();
        bo.setAge(17);
        bo.setGrossIncome(170000.0);

        // Call the CreditScore Service to fill the credit score
        CreditScoringService css = new CreditScoringService();
        css.setScore(500);
        css.getScore(bo);

        // Call the affordability model service
        AffordabilityModelService ams = new AffordabilityModelService();
        ams.runModel(bo);

        Property po = new Property();
        po.setPurpose(Flag.INVESTMENT);
        po.setYearBuilt(1961);
        po.setZipCode("22102");

        // Call the PropertyValue service
        PropertyValuationService pvs = new PropertyValuationService();
        pvs.setPropertyValue(800000.0);
        pvs.getPropertyValue(po);

        // Create a Loan Application
        LoanApplication la = new LoanApplication();
        la.setBorrower(bo);
        la.setProperty(po);
        la.setLoanAmount(700000.0);
        la.setLoanToValueRatio(la.getLoanAmount()/po.getValue()*100);

        //    Calls the underwriting service
        UnderwritingService ue = new UnderwritingService();
        ue.evaluate(la);

        System.out.println("\nTesting all feedback messages");
        System.out.println("=============================");
        System.out.println(la);
        System.out.println("Feedback message size=" + la.getFeedbackMsgSize());
        System.out.println("Affordability Flag=" + la.getAffordabilityFlag());
        System.out.println("Underwriting Decision=" + la.getStatus());

        assertEquals(la.getStatus(), Flag.FAILED);

    }
}

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