Write tests for the Fraction class definition discussed in lecture using the exp

Question

Write tests for the Fraction class definition discussed in lecture using the expected value actual value method of testing. For example if you created a method int mult (int a, int b),to test if it worked you would create a variable actual and a variable expected and compare them like so: int actual = mult (2, 3); int expected-6; boolean result - expected -- actual: System. out.println("TestMult:"+ result); Doing this allows for quicker evaluation of the tests, since you don't need to inspect the results any further than looking for any test that returned false.

Explanation / Answer

/*FractionTests.java*/

public class FractionTests

{

// Expected output:

// f1 = 2/3

// f2 = 4/5

// f1 ~ 0.6666666666666666

// f3 = 8/15

// f1 = 8/15

// f4 = 1/2

public static void main(String[] args)

{

Fraction f1 = new Fraction();

f1.setNumerator(2);

f1.setDenominator(3);

String actual=new String(f1.getNumerator()+"/"+f1.getDenominator());

String expected=new String("2/3");

System.out.println("f1 test:"+actual.equals(expected));

System.out.print("f1 = ");

System.out.print(f1.getNumerator());

System.out.print("/");

System.out.println(f1.getDenominator());

Fraction f2 = new Fraction();

f2.setNumerator(4);

f2.setDenominator(5);

actual=new String(f2.getNumerator()+"/"+f2.getDenominator());

expected=new String("4/5");

System.out.println("f2 test:"+actual.equals(expected));

System.out.print("f2 = ");

System.out.print(f2.getNumerator());

System.out.print("/");

System.out.println(f2.getDenominator());

double f1Approx = f1.toDouble();

double Expected= 0.6666666666666666;

double Actual= f1Approx;

System.out.println("f1 approx test:"+(Actual==Expected));

System.out.print("f1 ~ ");

System.out.println(f1Approx);

Fraction f3 = f1.times(f2);

// f3.numerator is 8

// f3.denominator is 15

// f1 is still 2/3 and f2 is still 4/5

actual=new String(f3.getNumerator()+"/"+f3.getDenominator());

expected=new String("8/15");

System.out.println("f3 fraction test:"+actual.equals(expected));

System.out.print("f3 = ");

System.out.print(f3.getNumerator());

System.out.print("/");

System.out.println(f3.getDenominator());

Fraction f4 = Fraction.multiplication(f1, f2);

// f4.numerator is 8

// f4.denominator is 15

// f1 is still 2/3 and f2 is still 4/5

actual=new String(f4.getNumerator()+"/"+f4.getDenominator());

expected=new String("8/15");

System.out.println("f4 multiplication test:"+actual.equals(expected));

System.out.print("f4 = ");

System.out.print(f4.getNumerator());

System.out.print("/");

System.out.println(f4.getDenominator());

f1.multiply(f2);

// f1.numerator is now 8

// f1.denominator is now 15

actual=new String(f1.getNumerator()+"/"+f1.getDenominator());

expected=new String("8/15");

System.out.println("f1 multiplication test:"+actual.equals(expected));

System.out.print("f1 = ");

System.out.print(f1.getNumerator());

System.out.print("/");

System.out.println(f1.getDenominator());

Fraction f5 = new Fraction();

f5.setNumerator(3);

f5.setDenominator(6);

f5.reduce();

// numerator is now 1, denominator is 2.

actual=new String(f5.getNumerator()+"/"+f5.getDenominator());

expected=new String("1/2");

System.out.println("f5 reduce test:"+actual.equals(expected));

System.out.print("f5 = ");

System.out.print(f5.getNumerator());

System.out.print("/");

System.out.println(f5.getDenominator());

if (f1.equals(f2))

{

System.out.println("f1 and f2 are equal.");

}

else

{

System.out.println("f1 and f2 are not equal.");

}

if (f1.equals(f3))

{

System.out.println("f1 and f3 are equal.");

}

else

{

System.out.println("f1 and f3 are not equal.");

}

if (f1.equals("Hello, World"))

{

System.out.println("f1 and "Hello, World" are equal.");

}

else

{

System.out.println("f1 and "Hello, World" are not equal.");

}

}

}

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