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TestNG is a testing framework that has some unique functionality, which makes it especially useful for unit testing that involves complex test setups such as integration or functional testing. Some of TestNG s features are JDK 5.0 annotations for the declaration of test assemblies, support for configuration parameters and flexible grouping of tests into test suites, support for a variety of plug-ins for IDEs and Ant, and the ability to execute tests in a specific order by following dependencies. We want to approach these features step by step, so you first write a simple logic unit test without any integration of a subsystem. A unit test in TestNG A logic unit test validates a single piece of functionality and checks whether all business rules are followed by a particular component or method. If you followed our discussion earlier in this chapter about smart domain models (section 16.1.4, Designing smart domain models ), you know that we prefer to encapsulate unit-testable business logic in the domain model implementation. A logic unit test executes a test of methods in the business layer and domain model:

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public class AuctionLogic { @org.testng.annotations.Test(groups = "logic") public void highestBidWins() { // A user is needed User user = new User(...); // Create an Item instance Item auction = new Item(...); // Place a bid BigDecimal bidAmount = new BigDecimal("100.00"); auction.placeBid(user, bidAmount, new BigDecimal(0), new BigDecimal(0) ); // Place another higher bid BigDecimal higherBidAmount = new BigDecimal("101.00"); auction.placeBid(user, higherBidAmount,

Access Data Sources Across Domains Allow META REFRESH Display Mixed Content Don t Prompt For Client Certificate Selection When No Certificates Or Only One Certificate Exists Drag And Drop Or Copy And Paste Files Installation Of Desktop Items Launching Programs And Files In An IFRAME Navigate Sub-Frames Across Different Domains Submit Nonencrypted Form Data User Data Persistence Active Scripting Allow Paste Operations Via Script Scripting Of Java Applets User Authentication Logon

Internet Explorer 6.0 and Windows XP Professional do not contain the Sun Microsystems Java Virtual Machine (JVM). The first time you connect to a Web site that requires JVM support, you must download JVM.

bidAmount, bidAmount ); // Assert state assert auction.getBids().size() == 2; } }

The Privacy tab of the Internet Options dialog box allows you to control how Internet Explorer handles cookies, which are small text files stored on your computer by Web sites. Web sites use cookies to store user preferences for personalized sites, and cookies often contain personal information used to identify the user to the Web site. Cookies can be either persistent (they remain after Internet Explorer is closed and can be reused) or temporary (they are deleted when Internet Explorer is closed). Also, there are first-party and third-party cookies. First-party cookies originate from the Web site that you are currently viewing. Third-party cookies originate from a site different from the one that you are currently viewing but are somehow related to the current Web site. For example, many sites use advertising from third-party sites that commonly use cookies to track your Web site usage for advertising purposes. Third-party cookies might compromise your privacy because advertisers can use them to track your Web site usage across multiple Web sites.

Configuring Internet Explorer Options 16-51

The class AuctionLogic is an arbitrary class with so-called test methods. A test method is any method marked with the @Test annotation. Optionally, you can assign group names to test methods so that you can assemble a test suite dynamically by combining groups later on. The test method highestBidWins() executes part of the logic for the Placing a bid use case. First, an instance of User is needed for placing bids that this, is the same user isn t a concern for this test. This test can fail several ways, indicating that a business rule has been violated. The first bid gets the auction started (the current maximum and minimum bids are both zero), so you don t expect any failure here. Placing a second bid is the step that must succeed without throwing a BusinessException, because the new bid amount is higher than the previous bid amount. Finally, you assert the state of the auction with the Java assert keyword and a comparison operation. You often want to test business logic for failure and expect an exception. Expecting failures in a test The auction system has a pretty serious bug. If you look at the implementation of Item.placeBid() in section 16.1.4, Designing smart domain models, you can see that you check whether the given new bid amount is higher than any existing bid amount. However, you never check it against the initial starting price of an auction. That means a user can place any bid, even if it s lower than the initial price. You test this by testing for failure. The following procedure expects an exception:

Table 16-9