Assignment: TwoMethods Submitted to WebCat

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Edward Gibbs
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1 Assignment: TwoMethods Submitted to WebCat For this assignment, you are asked to Implement one class with two unrelated methods and a unit test for those two methods On your personal machine only: Set up Eclipse to submit your Eclipse Projects to WebCat. Note: Although the Submit option is available in our CS labs in GS, you will need to add a plugin if using your home machine. Submit your Eclipse project to WebCat using the Submit option Implement a Unit test with two methods and a Unit test for both This project asks you to solve two problems related to the String type and the int primitive type. You are asked to write two methods in class TwoMethods and a test method for each in class TwoMethodsTest. Develop (code and test) one method at a time. In Eclipse, create new Java Project with the name TwoMethodsTest Create a class with File > New > Class After Name: type the name of the class you want to create. The first class you create will be called TwoMethodsTest. After you type that in, click Finish (at bottom). Copy and paste b(or type) the beginning of the required unit test that has the assertions, but not the methods being tested:

2 // This class has tests for two methods to provide practice for testing // methods that process Strings and some of the primitive types. // Programmer: Your Name import static org.junit.assert.*; import org.junit.test; public class TwoMethodsTest public void testisodd () { TwoMethods myfuns = new TwoMethods(); } // One test case to test the isodd method asserttrue(myfuns.isodd(3)); // TODO: Add more assertions to fully test isodd } // One more test method will be completed here later You are probably seeing errors because JUnit 4 is not on the build path. Click on a light bulb and choose the quick fix 'Add JUnit 4 to the build path'. Even though you are probably seeing compiletime errors (red lines), add more assertions until you feel you have covered all test cases such as odd numbers, negative integers and 0. Now make the unit test compile by adding class TwoMethods to your project with the isodd method (it is shown below with a non working method body--okay it may work about half of the time). Copy and paste this (or type it in):

3 /* * This class has two unrelated methods to provide practice for * implementing methods that are tested from a unit test. * Programmer: Your Name */ public class TwoMethods { // Return true if aninteger is an even integer // isodd(1) -> true // isodd(2) -> false public boolean isodd(int arg) { // TODO: Change this method body return false; } } // One more method will be completed here 1) Implement public boolean isodd(int arg) isodd returns true if the given argument arg is an odd integer. For example, isodd(-1) returns true isodd(9) -> true isodd(4) -> false Write the method body so isodd works Go back to the file ControlFunTest (click the tab above the edit window) Run ControlFunTest as a JUnit test by selecting Run > Run as > Junit Test

4 2) Implement public int largest(int a, int b, int c) Write a test method for largest in class TwoMethodsTest and write method largest in class TwoMethods. Use the given method heading. largest(1, 2, 3) -> 3 largest(9, 9, 9) -> 9 largest(-9, -5, -7) -> -5 After you have completely tested both methods, submit to the automated testing tool known as WebCat Submit your project to WebCat You will be graded on a scale of 0.0 through 10.0 automatically by WebCat. Here are the instructions for getting the Submit plugin for Eclipse and Submitting your first Webcat project. Read your to get for your Web-Cat account ID (almost always what comes and the randomly generated password Login to WebCat at this url: Change your password to a good password no one else can guess. Only do the following on your personal machine. This is already done in the CS Lab

$Copy three highlighted folders (beginning with net.sf.webcat) into the Eclipse plugin. For Window, the Eclipse plugin folder should be C:\Program Files\eclipse\ or c:\program Files\eclipse-SDK-3.$

5 If you haven't already, download WebCat's submit plugin to make it easy to submit projects: webcat-eclipse-submitter zip Unzip this archive file. Copy three highlighted folders (beginning with net.sf.webcat) into the Eclipse plugin. For Window, the Eclipse plugin folder should be C:\Program Files\eclipse\ or c:\program Files\eclipse-SDK-3.6- win32\eclipse\ For the Mac, you should copy these three folders into your folder ending with /Applications/eclipse/ plugins

6 In any system, restart Eclipse, select Window > Preferences > Electronic Submission Submit your Project to WebCat using the Plugin From Eclipse, select Window > Preferences > Electronic Submission Using your own Default username and your own address, fill in the four fields using this url for the Assignment definition URL (Recommended: Copy and paste this into the first field):

https://web-cat.cs.vt.edu/web-cat/webobjects/web-cat.

7 Click OK

8 Submit your project to WebCat Right click on your project name Select the Submit button (near the bottom of the list of options). WebCat will return the list of published projects under C Sc 227

9 Click on TwoMethodsTest Make sure UserName has you WebCat user name (not your CS login name) Enter your WebCat password Click Next and Finish Click view your graded results and wait until the report is posted back to you Wait until WebCat posts results back to the Eclipse browser--could take seconds If you get 100%, Congratulations! But please read the next page anyway -- almost done Interpreting Results Scroll down and click on the plus to the left of Estimate of Problem Coverage (50%)

11 Even though the student's unit test passed all of its tests, this project has 4 occurrences of assertions failing middletwo when run against Rick's reference tests. The hints say the test that failed, but not why. You also see that there was a String index out of bounds exception that should give the clue that the method is trying to return the substring that may be off by one index. This student should fix the code and resubmit. But if you have 100% and see 10.0 points, you are done.

Programming Project: ArrayFun

Programming Project: ArrayFun Collaboration: Solo with help from classroom/online resources, Lane, and/or Rick. Anyone can also share thoughts about any specification and possible algorithm, but no sharing