CS3354– Assignment 4 solved

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The goal of this assignment is to help students understand the use of JUnit to test
Java code.
In this assignment you will create a set of unit tests, to test the behavior of the code
written for Assignment 1.
To keep things consistent, please use the solution to Assignment 1 provided by the
instructor. You can find the solution on TRACS, under Resources > Assignmentrelated material > Assignment 1 – solution.
Note: Updated version of Assignment 1 solution has been uploaded to make testing
easier. Use the updated version.
A unit test is an automated piece of code that invokes a unit of work in the system
and then checks a single assumption about the behavior of that unit of work. A unit
of work is a single logical functional use case in the system that can be invoked by
some public interface (in most cases). A unit of work can span a single method, a
whole class or multiple classes working together to achieve one single logical
purpose that can be verified.
Think of unit testing as a way to test the behavior of the code (or parts of the code)
written, without actually having to run the program. For example, in the case of
assignment 1, assume that the front-end (MainApp console user interface) part of
the program and the back-end part of the program (ShippingStore database
management) are written by two different developers. How would the developer of
the back-end be able to ensure that the code he/she has written works correctly
without having access to the front-end?
In this assignment, you are asked to create JUnit tests to test the class ShippingStore,
including all its methods, written for Assignment 1.
First you should consider testing the behavior of the class/methods under normal
operation scenarios.
For example, to test the method findPackageOrder(String trackingNumber) of the
class ShippingStore, you may need to create a test method, which creates a mock
PackageOrder object and adds it to the packageOrerList before the method
findPackageOrder can be called to search for it. To ensure that everything worked as
planned, you can then search for the package using its trackingNumber and see if
the correct package is found. Mock objects can be created either in the same test
method or before any test methods are run, using the @BeforeClass annotation.
Subsequently, you can consider creating test cases for unusual scenarios, e.g. when a
certain input or behavior is expected to cause an exception to be thrown, or when a
user input is not as expected.
At the end create a TestRunner class, which has a main method that runs the unit
tests that you have created, and prints out the test results.
Do not modify the code of the solution to Assignment 1 provided.
1. Implement the JUnit tests to test only the class,
including all its methods. Try to be creative by coming up with test cases that
can test as many different situations as possible. You don’t need to test the
classes and
2. Use a standard Java coding style to improve your program’s visual
appearance and make it more readable. I suggest the BlueJ coding style:
3. Use Javadoc to document your code.
This assignment will be done and submitted individually by each student.
Submit your test code in a single file ( The xxxxxx is your TX
State NetID.
Submit an electronic copy only, using the Assignments tool on the TRACS website
for this class. Do NOT include executable or .class files in your submission.