Software Testing

POTD 1: JUnit - numZero

Due 19-May-2026, 11:59pm EST

Purpose:

Practice analyzing and designing tests for a program source code
Understand problems in test automation (controllability and observability) and try to minimize them
Hands-on experience with JUnit
Get ready to work on a learning portfolio

Require: Java 8 (or higher), JUnit (you are recommended to use the latest version, JUnit 5). If you have not set up your testing environment, please refer to the Schedule page for details on JUnit 5.

Additional resources: You may find class discussions on test automation, and characteristics of good tests helpful when designing and automating your tests.

Instruction:

You may work alone or with another student in this course.

Consider ArrayOperations.java.

Develop at least 5 JUnit tests to evaluate the ArrayOperations.numZero() method.
Note that there exists a fault,which is a static defect in the source code, in the method under test.
At least one of your tests must detect the fault in the method under test — that is, your test case causes the failure to propagate and your test oracle reveals the failure.
You may create a new JUnit test file or add your JUnit tests to the ArrayOperationsNumZeroTest.java template.

Reminder: You are writing tests to check against ArrayOperations.java. Thus, do not modify ArrayOperations.java; it is the program under test.

Grading rubric

[Total: 10 points]: Done (or provide evidence of your attempt, full or reasonable effort)

(5 points) — Providing evidence of your attempt, minimal effort

(-2.5 points) for 24 hours late (submitted after 19-May-2026 11:59pm EST, by 20-May-2026 11:59pm EST)
(-5 points) for 48 hours late (submitted after 20-May-2026 11:59pm EST, by 21-May-2026 11:59pm EST)

Submission

Upload your ArrayOperationsNumZeroTest.java to POTD 1 on Gradescope
Make sure you connect your partner to your group on Gradescope so that everyone receives credit
Each team submits only one copy

Making your submission available to instructor is your responsibility; if we cannot access or open your file, you will not get credit. Be sure to test access to your file before the due date.

CC-BY-NC-SA 4.0 license.
Last updated 2026-05-18 14:42