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Assignment 4: Static Code Analysis and Unit Testing
ECE 325 OBJECT-ORIENTED SOFWARE
DES (LEC A1 Fa18)
Assignment 4: Static Code Analysis and Unit
Testing
·Source code: CodingHorror.java; UnitTesting.zip.  A working copy of your solution must be submitted
to eClass before this date.
Import the project from the zip file to read the source codes.
Part 1: Static Code Analysis
Consider the CodingHorror program, although it compiles, it fails to do what the programmer wants.
The programmer intends to read a string from the user, substitute all “e” characters with “o”
characters, then check whether the substitution results in the string “pool”. This will never be the
case, no matter what input we provide, because of faults in the code.
Your task is to utilize the static analysis tool FindBugs, a popular open source static code checker for
Java, to find the FIVE bugs reported by the tool and contained within the code.
Hint: Sometimes one bug hides another bug; and the second bug is only revealed by removing the
first bug. That is, think iteration.
Note 1: Findbugs is likely to report a sixth error, Internationalization. It is something that goes beyond
the scope of previous Java classes so we will ignore this one.
Note 2: If you choose Firebugs version 3.0.0 or earlier (now the newest version is 3.0.1, as of Sept.
30, 2018), you can only get four bugs detected.
Compile theCodingHorror.javasource code into bytecodes file, and then start up the FindBugs
program to analyze it: New Project Classpath for analysis Add Analyze. The application will
then produce a list of bugs that are present within your code.
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id=3237746
1 of 5 2018-12-22, 9:20 p.m.
Your task is to provide a brief summary of each bug identified:
1.What is the bug;
2.Why it is happening;
3.Provide a solution to fix the bug.
Part 2: Unit Testing
In this part, you will explore Unit Testing (UT) by using the technique in conjunction with the Eclipse
IDE to develop a trivial application. This unit test will provide 4 test suites (Question 1 to 4), which will
be used to drive the development of the Calculator class.
Your task is to complete the 5 following checkpoints and submitting your final answers as a Java
project.
1. Implement functionality defined by Test Suite “Question 1”
Navigate to Test Suites Question1.java, and run it as JUnit Test. An output will come up and inform
you that there are errors! This is to be expected, don’t panic! Now you need to fix these errors.
Your task in this step is to fix the errors and implement only the required functionality (src Calculator.java
and re-run the Question 1 test suite.
CHECKPOINT 1: Test Suite “Question 1” runs without any problems, but other test suites fail.
2. Implement functionality defined by Test Suite “Question 2”
Navigate toTest Suites Question2.java, and run it as JUnit Test. Your task here is to fix the errors
and implement only the required functionality and re-run the Question 2 test suite.
CHECKPOINT 2: Test Suite “Question 2” runs without any problems, but higher test suites fail.
3. Implement functionality defined by Test Suite “Question 3”
Navigate toTest Suites Question3.java, and run it as JUnit Test. Fix the errors and implement only
the required functionality and re-run the Question 3 test suite.
CHECKPOINT 3: Test Suite “Question 3” runs without any problems, but higher test suites fail.
4. Create Test Cases within “SqureRootTests.java” Navigate to Test Suites Question4.java, and run it as JUnit Test. Question 4 will run with no
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id=3237746
2 of 5 2018-12-22, 9:20 p.m.
problems because there are no test cases defined inSquareRootTests.java. So open Test
Cases SquareRootTests.java. Fill in the following four test cases with proper asserts:
testRandomPositiveSquareRoot()
testRandomNegitiveSquareRoot()
testSquareRootofZero()
testSquareRootofOne()
CHECKPOINT 4: Test Suite “Question 4” fails on the 4 defined test cases
5. Implement functionality defined by Test Suite “Question 4”
Navigate to Test Suites Question4.java again, and run it as JUnit Test. Now errors are found. Fix
them and implement the required functionality and re-run the Question 4 test suite.
CHECKPOINT 5: Test Suite “Question 4” runs without any errors.
CodingHorror.java
UnitTesting.zip
Submission status
Attempt number This is attempt 1 ( 1 attempts allowed ).
Submission status Submitted for grading
Grading status Graded
Due date Thursday, 11 October 2018, 5:00 PM
Time remaining Assignment was submitted 1 day 1 hour early
Last modified Wednesday, 10 October 2018, 3:23 PM
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Assignment4.zip
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Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id=3237746
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Grade 20.00 / 20.00
Graded on Tuesday, 16 October 2018, 9:52 PM
Graded by Mona Nashaat Ali Elmowafy
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