Question

PLEASE HURRY

Software Testing

Don't make any changes to the provided code. Please write a test case for the below prompt using the provided java programs

Use the setString() function in MyCustomStringInterface to set the value to “Peter Piper picked a peck of pickled peppers.”. Then test to see if reverseNCharacters() function returns the reversed string when the characters are reversed in groups of 4 and padding is disabled (in this case, “etePiP r repkcipa decep fo kcip delkpep srep.”).

Next, test to see if reverseNCharacters() provides the correct output for the same input and grouping when padding is enabled (in this case, “etePiP r repkcipa decep fo kcip delkpep srepXXX.”).

MyCustomString.java

public class MyCustomString implements MyCustomStringInterface {
private String string;

@Override
public String getString() {
return string;
}

@Override
public void setString(String string) {
this.string = string;
}

@Override
public int countNumbers() {
StringBuffer tmpString = new StringBuffer();
int count=0;
boolean inNumber=false;
//avoid null pointer exception!
if(string==null || string.isEmpty())
return 0;
for (int i = 0; i < string.length(); i++) {
char ch = string.charAt(i);
if (Character.isDigit(ch)) {
if (!inNumber) {
count++;
inNumber = true;
}
}
else {
if (inNumber) {
inNumber = false;
}
}
}
return count;
}

@Override
public String reverseNCharacters(int n, boolean padded) {
if (string == null) {
throw new NullPointerException();
}
if (n <= 0) {
throw new IllegalArgumentException();
}
StringBuffer tmpString = new StringBuffer();
StringBuffer resultString = new StringBuffer();
StringBuffer currString = new StringBuffer(string);

int i;
for (i = 0; i + n < currString.length(); i+=n) {
tmpString = tmpString.append(new StringBuffer(currString.substring(i,i+n)).reverse());
}
if (padded)
{
for (int x = n - (currString.length() - i); x > 0; x--)
currString.append('X');
}
tmpString = tmpString.append(new StringBuffer(currString.substring(i)).reverse());

return tmpString.toString();
}

@Override
public void convertDigitsToNamesInSubstring(int startPosition, int endPosition) {
if (string == null) {
throw new NullPointerException();
}
if ((startPosition > endPosition)) {
throw new IllegalArgumentException();
}

if (endPosition > string.length() || (startPosition < 1)){
throw new MyIndexOutOfBoundsException();
}
StringBuffer tmpString = new StringBuffer();
String tmpDigit = new String();
boolean look_back = false;
for (int i = 0; i < string.length(); i++) {
char ch = string.charAt(i);
if ((i < startPosition - 1) || (i > endPosition - 1)) {
if(look_back) {
look_back = false;
}
tmpString.append(ch);
continue;
} else {
if (Character.isDigit(ch)) {
switch (ch) {
case '0':
tmpDigit = "Zero";
break;
case '1':
tmpDigit = "One";
break;
case '2':
tmpDigit = "Two";
break;
case '3':
tmpDigit = "Three";
break;
case '4':
tmpDigit = "Four";
break;
case '5':
tmpDigit = "Five";
break;
case '6':
tmpDigit = "Six";
break;
case '7':
tmpDigit = "Seven";
break;
case '8':
tmpDigit = "Eight";
break;
case '9':
tmpDigit = "Nine";
break;
}
if(look_back)
tmpString.append(tmpDigit.toLowerCase());
else
tmpString.append(tmpDigit);
look_back = true;
} else {
if(look_back){
look_back = false;}
tmpString.append(ch);

}
}
}
string = tmpString.toString();
}
}

MyCustomStringInterface.java

/**
* This is an interface for a simple class that represents a string, defined
* as a sequence of characters.
*
* This interface should NOT be altered in any way.
*/
public interface MyCustomStringInterface {

/**
* Returns the current string. If the string is null, it should return null.
*
* @return Current string
*/
String getString();

/**
* Sets the value of the current string.
*
* @param string The value to be set
*/
void setString(String string);

/**
* Returns the number of numbers in the current string, where a number is defined as an
* unbroken sequence of digits.
*
* If the current string is null, empty, or uninitialized, the method should return 0.
*
* Examples:
* - countNumbers would return 2 for string "My numbers are 11 and 9".
*
* @return Number of numbers in the current string
*/
int countNumbers();

/**
* Returns a string that consists of all characters in the original string with each segment of n characters
* reversed.
* If padded is true, the final segment of characters will have the character 'X' added to it enough time to make
* a full segment.
*

*

* Examples:
* - For n=2 and padded=true, the method would return the string with every pair of characters swapped in place, and
* if there were an odd number of characters, an X would be added to the last segment before it is reversed.
* - For n=3 and padded=false, the method would return the string with every segment of 3 characters reversed in place,
* and the final segment would be reversed even if less than 3 characters without any additional characters added.
*

* Values n and padded are passed as parameters. The starting character is considered to be in Position 1.
*
* @param n Determines size of the string segments to be reversed
* @param padded Determines whether an incomplete final segment will be padded with 'X'.
* @return String with the segments in their original order and the contents of the segments reversed.
* @throws NullPointerException If the current string is null or uninitialized.
* @throws IllegalArgumentException If "n" less than or equal to zero, and the current string is not null.
*/
String reverseNCharacters(int n, boolean padded);

/**
* Replace the individual digits in the current string, between startPosition and endPosition
* (included), with the corresponding English names of those digits, with the first letter of a number (unbroken
* string of digits) capitalized. The first character in the string is considered to be in Position 1.
*
* Examples:
* - String 460 would be converted to Foursixzero
* - String 416 would be converted to Fouronesix
*
* @param startPosition Position of the first character to consider
* @param endPosition Position of the last character to consider

* @throws NullPointerException If the current string is null or uninitialized.
* @throws IllegalArgumentException If "startPosition" > "endPosition"
* @throws MyIndexOutOfBoundsException If "startPosition" < 1 or "endPosition" is out of bounds (greater than the
* length of the string) and "startPosition" <= "endPosition"
*/
void convertDigitsToNamesInSubstring(int startPosition, int endPosition);
}

MyIndexOutOfBoundsException.java

public class MyIndexOutOfBoundsException extends RuntimeException {
   private static final long serialVersionUID = 8226094121089030034L;

   public MyIndexOutOfBoundsException(String message) {
       super(message);
   }

   public MyIndexOutOfBoundsException() {
       super();
   }
}

Answer 1

Hi, I have answered previous part of this question (testing countNumbers). I’m assuming that by test case, you meant JUnit testing. Here is needed code for MyCustomStringTest class which has methods testCountNumbers and testReverseNCharacters, which will test the countNumbers function and reverseNCharacters methods of MyCustomStringInterface respectively as mentioned in the question. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

//MyCustomStringTest.java

import static org.junit.Assert.*;

import org.junit.Test;

public class MyCustomStringTest {

    private MyCustomStringInterface myCustomStr;

    // JUnit test method for testing countNumbers method

    @Test

    public void testCountNumbers() {

        // initializing MyCustomString object

        myCustomStr = new MyCustomString();

        // using setString, updating the text

        myCustomStr.setString("H3y, l3t'5 put s0me d161ts in this 5tr1n6!11!!");

        // ensuring that the countNumbers return 9

        assertEquals(myCustomStr.countNumbers(), 9);

    }

    // JUnit test method for testing reverseNCharacters method

    @Test

    public void testReverseNCharacters() {

        // initializing MyCustomString object

        myCustomStr = new MyCustomString();

        // using setString, updating the text

        myCustomStr.setString("Peter Piper picked a peck of pickled peppers.");

        // ensuring that correct String is returned when the characters are

        // reversed in groups of 4 and padding is disabled

        assertEquals(myCustomStr.reverseNCharacters(4, false),

                 "etePiP r repkcipa decep fo kcip delkpep srep.");

        // ensuring that correct String is returned when the characters are

        // reversed in groups of 4 and padding is enabled

        assertEquals(myCustomStr.reverseNCharacters(4, true),

                 "etePiP r repkcipa decep fo kcip delkpep srepXXX.");

    }

}