JUnit Testing

$1.$ Develop four JUnit tests to evaluate ArrayOperations.numZero$()$ method. Please add your JUnit tests to ArrayOperationsNumZeroTest.java. Is there a fault in this method? Can your tests reveal the failure?

$2.$ Please try designing one more test to test that the NullPointerException is thrown as expected.

$3.$ Please try modifying$/$re$-$organizing your tests by adding test fixtures @Before and @After. It is ok to create additional test files if some tests do not share the same pre or post$-$conditions.

$4.$ Calc.java provides a simple calculation method add $($int$,$ int$).$ Please add a new method to calculate multiply $($int$,$ int$).$

$5.$ Design four JUnit tests using the traditional way for the new method multiply $($int$,$ int$).$

$6.$ Following the data$-$driven JUnit example in DataDrivenCalcTest.java, please modify your four tests into data$-$driven JUnit tests.

Program #$1$ ArrayOperations

package inclass;

public class ArrayOperations

$\{$

$//$ Adapted from "Introduction to Software Testing",

$//$ by Ammann and Offutt

public static int numZero$($int$[]$ x$)$

$\{$

$//$ Effects: if x $==$ null throw NullPointerException

$//$ else return the number of occurrences of $0$ in x

int count $=0$;

for $($int i$=1$; i$0$; i$--)$

$\{$

if $($x$[$i$]==$ y$)$

return i;

$\}$

return $-1$;

$\}$

$//$ test: x $=[2,3,5]$; y $=2$;

$//$ expected $=0$

public static int countPositive $($int$[]$ x$)$

$\{$

if $($x $==$ null$)$

throw new NullPointerException$()$;

int count $=0$;

for $($int i$=0$; i$=0)$

count$++$;

$\}$

return count;

$\}$

$//$ test: x $=[-4,2,0,2]$

$//$ expected $=2$

public static int lastZero $($int$[]$ x$)$

$\{$

if $($x $==$ null$)$

throw new NullPointerException$()$;

for $($int i$=0$; i $0)$

count$++$;

$\}$

return count;

$\}$

$//$ test: x $=[-3,-2,0,1,4]$

$//$ expected $=3$

$\}$

Program #$2$ ArrayOperationsNumZeroTest

package inclass;

import static org.junit.Assert.$*$;

import org.junit.Test;

public class ArrayOperationsNumZeroTest

$\{$

@Test

public void testNumZeroEmptyArray$()$

$\{$

int x$[]=\{\}$; $//$ zero$-$sized array

int n $=$ ArrayOperations.numZero$($x$)$;

assertEquals$("0$ zeros", $0,$ n$)$;

$\}$

@Test

public void testNumZeroArrayWithNoZeros$()$

$\{$

int$[]$ x $=\{1,2,3\}$;

int n $=$ ArrayOperations.numZero$($x$)$;

assertEquals$("0$ zeros in an array with no zeros", $0,$ n$)$;

$\}$

$\}$

Program #$3$ Calc

$//$ Introduction to Software Testing

$//$ Authors: Paul Ammann & Jeff Offutt

$//$ Chapter $?$; page $??$

$//$ See CalcTest.java, DataDrivenCalcTest.java for JUnit tests

public class Calc

$\{$

static public int add $($int a$,$ int b$)$

$\{$

return a $+$ b;

$\}$

$\}$

Program #$4$ DataDrivenCalcTest

$//$ Introduction to Software Testing

$//$ Authors: Paul Ammann & Jeff Offutt

$//$ Chapter $?$; page $??$

$//$ JUnit for Calc.java

import org.junit.$*$;

import org.junit.runner.RunWith;

import org.junit.runners.Parameterized;

import org.junit.runners.Parameterized.Parameters;

import static org.junit.Assert.$*$;

import java.util.$*$;

@RunWith $($Parameterized$.$class$)$

public class DataDrivenCalcTest

$\{$

public int a$,$ b$,$ sum;

public DataDrivenCalcTest $($int a$,$ int b$,$ int sum$)$

$\{$

this.a $=$ a;

this.b $=$ b;

this.sum $=$ sum;

$\}$

@Parameters

public static Collection calcValues$()$

$\{$

return Arrays.asList $($new Object $[][]\{\{1,1,2\},\{2,3,5\}\})$;

$\}$

@Test

public void additionTest$()$

$\{$

assertTrue $("$Addition Test", sum $==$ Calc.add $($a$,$b$))$;

$\}$

$\}$

Please give solution and detailed explanation for each program. Thank you.