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It s debatable whether unit tests can ever provide all the documentation required for an application. Moreover, writing tests to test application code and to serve as documentation unavoidably overloads unit tests with responsibilities. This overload may not always be apparent. However, we ve seen cases where unit tests could not be altered to become more efficient in the way they tested the software because developers feared they would not document the code anymore. We believe that unit tests that serve as documentation is a misleading approach to unit testing and that many developers take it too seriously. We can understand that developers welcome any approach that relieves them from having to write documentation. We also believe that this argument has helped to sell TDD books in the past (and probably still does today). But as far as we are concerned, this argument has no strong foundation. Good documentation is much more beneficial to the consumer of an application. And it requires developers to profoundly think about the approaches they are taking.
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JUnit is the de facto standard for unit testing of your Java applications. It is an automated testing framework that allows you to easily create tests for your Java classes. JUnit provides the most commonly used functionality for building robust unit tests. Another advantage of using JUnit is that most IDEs provide support for running JUnit tests. Also, JUnit is supported out of the box by build tools like Ant (http://ant.apache.org) and Maven (http://maven.apache.org). In this section, we will use JUnit to build a test for a unit of our tennis club application. First, we will need to develop the functionality to meet the requirements.
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Establishing the Requirements
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We need to calculate the membership fee per member based on a number of factors. These factors can change over time, but currently we use these rules to determine the rate: Members younger than 14 years old pay $25 for three months or $90 for a full year membership. Members between 14 years and less than 18 years old and members over 50 years old pay $35 for three months or $126 for a full year membership. Members over 18 years and less than 50 years old pay $50 for three months or $180 for a full year membership. A member s age is his or her age at the date of the invoice. All members get a 25% reduction on all the membership rates if they have a membership with the national tennis federation.
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CHAPTER 10 TESTING
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We could create an interface that is responsible for calculating the membership fee, like this: package com.apress.springbook.chapter10;
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public interface MembershipFeeCalculator { double calculateMembershipFee(Member member); } The MembershipFeeCalculator interface looks adequate for other classes in the sample application to use whenever they need to calculate the membership fee for a member. However, some issues make this interface less than acceptable. First of all, for now we only need to know the age of a member, the member s payment preference, and whether the member has a membership with the national tennis federation. For this data, there are getter methods on the Member class. However, it seems like the Member class is too generic for this calculation since it has many other getter methods. Hence, the MembershipFeeCalculator doesn t clearly communicate how membership fees are calculated. This may sound like a good abstraction, since callers should not care about how the membership fee is calculated, but if we take a closer look, we ll find that other classes can calculate a membership fee only for the current age of a member. The MembershipFeeCalculator can t calculate future membership fees. It also cannot calculate fees for prospective members, since they do not have a Member object.
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