POTD 5: Data flow graph coverage for source code

Due 10-Mar-2026, 11am EST

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Purpose:

• Create graph representation for source code
• Apply structural data flow graph coverage to source code
• Get ready for assignment 4
• Prepare for quiz 3 and the final exam

You may make a copy of a worksheet and complete this activity, or simply type your answers in any text editor.

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

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Consider the following Java method

public static List<String> fizzBuzz(int n) 
{
   var answer = new ArrayList();
   for (int i = 1; i <= n; i++) 
   {
      if (i % 2 == 0 && i % 3 == 0)
         answer.add("FizzBuzz");
      else if (i % 2 == 0)
         answer.add("Fizz");
      else if (i % 3 == 0)
         answer.add("Buzz");
      else
         answer.add(Integer.toString(i));
   }
   return answer;
} 

1. Draw a Control Flow Graph for the fizzBuzz method Annotate all information (i.e., source code, defs and uses).
2. List all du-pairs, then derive du-paths (the du-paths then can be used as test requirements)

   DU-pairs	DU-paths

3. Apply All-Defs coverage to design tests

   Test requirements	Test paths	Test cases (input values and expected output)

4. Apply All-Uses coverage to design tests

   Test requirements	Test paths	Test cases (input values and expected output)

5. Apply All-DU-Paths coverage to design tests

   Test requirements	Test paths	Test cases (input values and expected output)

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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 10-Mar-2026 11am EST, by 11-Mar-2026 11am EST)
(-5 points) for 48 hours late (submitted after 11-Mar-2026 11am EST, by 12-Mar-2026 11am EST)

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Submission

• Take a selfie (or picture) of your team — get creative and have fun! — and submit it with your POTD.
• If you write your answer(s) or draw a graph on papers, take screenshot(s) of your answer(s)/graph. Submit them with your report.
• You may do one of the following:
  • take screenshot(s) of your POTD — if you write your answer(s) or draw a graph on papers, or
  • save your POTD as a .pdf file — No Word document.
• Upload your POTD to POTD 5 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 and course staff 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.

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Copyright © 2026 Upsorn Praphamontripong
Released under the CC-BY-NC-SA 4.0 license.
Last updated 2026-02-26 20:18