Hello, do you think you can help me with this assignment?

/*

 * Small class to practice writing JUnit tests 

 * Author: Renata Rand McFadden

 * version 1

 */

public class MyFax {

 

// attributes

private String type;      // fax type 

private String serial;    // fax serial number

private long number;  // phone number to dial - 10 digits (note that does not allow leading 0s)

 

// default constructor

// Assigns "None" to type and serial and -1 to number

public MyFax()

{

type = serial = "None";

number = -1;

}

 

// constructor

// throws IllegalArgumentException if either parameter is null or an empty string

// otherwise assigns parameter value of t to type and s to serial

public MyFax(String t, String s)

{

if (s == null || s == "")

{

throw new NullPointerException("Parameter cannot be null or empty");

}

type = t;   // assign t value of parameter to attribute type

serial = s; // assign s value of parameter to attribute serial

}

 

// returns current value of number attribute

public long getNumber()

{

return number;

}

 

// returns current value of type attribute

public String getType()

{

return type;

}

 

// returns current value of serial attribute

public String getSerial()

{

return serial;

}

 

// throws IllegalArgumentException if number is not a positive value or not 10 digits

// otherwise assigns parameter value of num to number attribute

// Implementation does not allow leading 0s

public void setNumber(long num)

{

int length = String.valueOf(num).length();

if (num < 1 || length < 10 )

{

throw new IllegalArgumentException("Parameter must be positive value and 10 digits");

}

number = num;   // assign num value of parameter to attribute number

}

 

}

 

 

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