CS6300 Assignment 3-Basic Java coding and JUnit Solved
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This assignment assesses your basic knowledge of Java and JUnit, which you will need for future assignments and projects.
Instructions
To complete the assignment, you must complete the following tasks:
● Clone your individual GitHub repository in your local workspace. This is the same repository that you used for the previous assignment and will use for all future individual assignments:
https://github.gatech.edu/gt-omscs-se... username›.git
● Download the archive assignment 3.tar.gz
● Extract the archive in the root directory of the repository, which will create a directory called Assignment3 and several subdirectories. Hereafter, we will refer to the directory Assignment3 in your local repo as ‹dir›.
(If you do not know how to extract a “tar.gz” archive, you should be able to find plenty of resources on how to do that online–ask on Ed Discussion otherwise.)
○ Directory ‹dir›/src contains, in a suitable directory, the Java interface edu.gatech.seclass.MyStringInterface. It also contains an exception class edu.gatech.seclass.MyIndexOutOfBoundsException, which is used by the interface.
○ Directory ‹dir›/test contains, in a suitable directory, a template JUnit test class edu.gatech.seclass.MyStringTest.
○ File ‹dir›/lib/junit-platform-console-standalone-1.9.1.jar, a JUnit library to be used for the assignment
● Your first task is to develop a Java class called MyString that suitably implements the MyStringInterface interface that we provided. The semantics of the methods in the interface should be obvious from their name, the JavaDoc comments in the code, and the test examples in class MyStringTest–ask on Ed Discussion otherwise. Class MyString should be in the same package as the interface and should also be saved under ‹dir›/src/edu/gatech/seclass.
● Your second task is to develop a set of JUnit5 test cases for class MyString by completing the provided template test class MyStringTest, which contains 3 complete test cases and 13 to-be-completed test cases. For each test case in class MyStringTest whose body simply consists of the placeholder instruction “fail(“Not yet implemented”);”, you must do the following:
○ Provided for you:
■ Placeholder instruction ○ Required from you:
■ Write a meaningful test case for the method, as identified by the placeholder instruction.
■ Replace the text “‹Add test description here›” in the test comment with a concise description of the purpose of the test (e.g., “Count words in an empty string”) without modifying anything else in the comment and making sure that your comment consists of a single line (i.e., does not contain newlines) and does not contain quotes or other special characters.
■ Make sure that every test method has a suitable oracle (i.e., either an assertion or an expected exception) and that the tests are not trivial (i.e., are not a copy of the provided one and have a specific purpose). In other words, each test should (1) test a specific piece of the functionality, and
(2) check that such a piece of functionality behaves as expected.
■ It should be obvious, but please also make sure that all the test cases you created pass when run against your code.
■ In addition, at least two of the tests that you develop must result in an expected exception (e.g., NullPointerException). When testing for an expected exception, make sure to assert as follows:
assertThrows(‹exception_class_name›.class, () -› mystring.‹method_name›(..args))
○ Consider, for example, test case testCountWordsS2():
@Test
@Timeout(value = 5000, unit = TimeUnit.MILLISECONDS)
// Description: ‹Add test description here› public void testCountWordsS2() { fail(“Not yet implemented”);
}
In your submission, you should have a corresponding, complete test for method countWords in class MyString, together with a concise description of the purpose of the method, such as:
@Test
@Timeout(value = 5000, unit = TimeUnit.MILLISECONDS) // Description: Count words in an empty string public void testCountWordsS2() {
‹actual test, including the oracle›
}
Submission
To submit your solution, you should:
● Submit on Gradescope a file, called submission.txt that contains, in two separate lines (1) your GT username and (2) the commit ID for your submission. For example, the content of file submission.txt for George P. Burdell could look something like the following: submission.txt
gpburdell1
81b2f59
The grade you will see on Grad
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