Question

How do i debug this/ import what needs to be imported?

import org.junit.Assert;
import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;
import java.lang.reflect.*;

public class GPACalculatorTest {

GPACalculator calc;

/** Fixture initialization (common initialization
* for all tests). **/
@Before public void setUp() {
calc = new GPACalculator();
}

/* Tests to make sure that the constructor is initializing the gpaTotal variable correctly.
* If you are seeing -1 as your actual value, you either aren't initializing it at all,
* or you changed the name of the variable */
@Test public void constructorTest1(){
double gpaTotal = -1;
try{
/* Note that you do not need to understand how this test works. This is some
* fancy stuff to get around the fact that these variables are private. You
* should not try to do this outside of testing, as it defeats the purpose of
* things being private */
Field gpaTotalField = GPACalculator.class.getDeclaredField("gpaTotal");
gpaTotalField.setAccessible(true);
gpaTotal = (double)gpaTotalField.get(calc);
} catch (Exception e){}
// Message for the test Expected, Actual , Acceptable margin of error
Assert.assertEquals("gpaTotal is initialized correctly by constructor", 0.0 , gpaTotal, 0.0);
}

/* Tests to make sure that the constructor is initializing the numCredits variable correctly.
* If you are seeing -1 as your actual value, you either aren't initializing it at all,
* or you changed the name of the variable */
@Test public void constructorTest2(){
int numCredits = -1;
try{
/* Note that you do not need to understand how this test works. This is some
* fancy stuff to get around the fact that these variables are private. You
* should not try to do this outside of testing, as it defeats the purpose of
* things being private */
Field numCreditsField = GPACalculator.class.getDeclaredField("numCredits");
numCreditsField.setAccessible(true);
numCredits = (int)numCreditsField.get(calc);
} catch (Exception e){}
// Note that int assertions don't need an acceptable margin of error
// Message for the test Expected, Actual
Assert.assertEquals("gpaTotal is initialized correctly by constructor", 0 , numCredits);
}

/* Checks to make sure that getGPA() returns the correct value after the GPACalculator has been created */
@Test public void getGPATest1(){
Assert.assertEquals("getGPA returns the correct value of the GPA after initialization", 0.0, calc.getGPA(), 0.0);
}

/* Checks to make sure that getCredits() returns the correct value after the GPACalculator has been created */
@Test public void getCreditsTest1(){
Assert.assertEquals("getCredits returns the correct value of the GPA after initialization", 0, calc.getCredits());
}

/* Checks to make sure that add() returns the correct GPA after it has been updated*/
@Test public void addTest1(){
double result = calc.addNewGradeToGPA(3.0, 4);
Assert.assertEquals("add returns the correct GPA after it has been updated the first time", 3.0, result, 0.0);
}
  
/* Checks to make sure that add() returns the correct GPA after it has been updated repeatedly*/
@Test public void addTest2(){
calc.addNewGradeToGPA(3.0, 4);
calc.addNewGradeToGPA(4.0, 4);
double result = calc.addNewGradeToGPA(1.0, 4);
double expected = (3.0*4+4.0*4+1.0*4)/(4+4+4);
Assert.assertEquals("add returns the correct GPA after being updated multiple times", expected, result, 0.0001);
}

/* Checks to make sure that add() returns the correct GPA after it has been updated more complexly*/
@Test public void addTest3(){
calc.addNewGradeToGPA(3.0, 4);
calc.addNewGradeToGPA(4.0, 2);
double result = calc.addNewGradeToGPA(1.0, 0);
double expected = (3.0*4+4.0*2+1.0*0)/(4+2+0);
Assert.assertEquals("add returns the correct GPA after it has been updated in more complex ways", expected, result, 0.0001);
}

/* Checks to make sure getGPA continues to return correct GPA values after updates */
@Test public void getGPATest2(){
calc.addNewGradeToGPA(3.0, 4);
calc.addNewGradeToGPA(4.0, 2);
calc.addNewGradeToGPA(1.0, 0);
double result = calc.getGPA();
double expected = (3.0*4+4.0*2+1.0*0)/(4+2+0);
Assert.assertEquals("getGPA returns the correct GPA after it has been updated", expected, result, 0.0001);
}

/* Checks to make sure getCredits continues to return correct values after updates */
@Test public void getCreditsTest2(){
calc.addNewGradeToGPA(3.0, 4);
calc.addNewGradeToGPA(4.0, 2);
calc.addNewGradeToGPA(1.0, 0);
int result = calc.getCredits();
int expected = 4+2+0;
Assert.assertEquals("getCredits returns the correct number of total credits taken", expected, result);
}

/* Checks to make sure reset() resets GPA correctly */
@Test public void resetTest1(){
calc.addNewGradeToGPA(3.0, 4);
calc.addNewGradeToGPA(4.0, 2);
calc.addNewGradeToGPA(1.0, 15);
calc.reset();
double result = calc.getGPA();
double expected = 0;
Assert.assertEquals("reset correctly resets the total gpa", expected, result, 0);
}

/* Checks to make sure reset() resets credits correctly */
@Test public void resetTest2(){
calc.addNewGradeToGPA(3.0, 4);
calc.addNewGradeToGPA(4.0, 2);
calc.addNewGradeToGPA(1.0, 15);
calc.reset();
int result = calc.getCredits();
int expected = 0;
Assert.assertEquals("reset correctly resets the total gpa", expected, result);
}
}
Errors:

----jGRASP exec: javac -g GPACalculatorTest.java
GPACalculatorTest.java:1: error: package org.junit does not exist
import org.junit.Assert;
^
GPACalculatorTest.java:2: error: package org.junit does not exist
import static org.junit.Assert.*;
^
GPACalculatorTest.java:3: error: package org.junit does not exist
import org.junit.Before;
^
GPACalculatorTest.java:4: error: package org.junit does not exist
import org.junit.Test;
^
GPACalculatorTest.java:14: error: cannot find symbol
@Before public void setUp() {
^
symbol: class Before
location: class GPACalculatorTest
GPACalculatorTest.java:22: error: cannot find symbol
@Test public void constructorTest1(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:40: error: cannot find symbol
@Test public void constructorTest2(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:57: error: cannot find symbol
@Test public void getGPATest1(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:62: error: cannot find symbol
@Test public void getCreditsTest1(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:67: error: cannot find symbol
@Test public void addTest1(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:73: error: cannot find symbol
@Test public void addTest2(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:82: error: cannot find symbol
@Test public void addTest3(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:91: error: cannot find symbol
@Test public void getGPATest2(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:101: error: cannot find symbol
@Test public void getCreditsTest2(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:111: error: cannot find symbol
@Test public void resetTest1(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:122: error: cannot find symbol
@Test public void resetTest2(){
^
symbol: class Test
location: class GPACalculatorTest
GPACalculatorTest.java:34: error: cannot find symbol
Assert.assertEquals("gpaTotal is initialized correctly by constructor", 0.0 , gpaTotal, 0.0);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:53: error: cannot find symbol
Assert.assertEquals("gpaTotal is initialized correctly by constructor", 0 , numCredits);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:58: error: cannot find symbol
Assert.assertEquals("getGPA returns the correct value of the GPA after initialization", 0.0, calc.getGPA(), 0.0);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:63: error: cannot find symbol
Assert.assertEquals("getCredits returns the correct value of the GPA after initialization", 0, calc.getCredits());
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:69: error: cannot find symbol
Assert.assertEquals("add returns the correct GPA after it has been updated the first time", 3.0, result, 0.0);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:78: error: cannot find symbol
Assert.assertEquals("add returns the correct GPA after being updated multiple times", expected, result, 0.0001);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:87: error: cannot find symbol
Assert.assertEquals("add returns the correct GPA after it has been updated in more complex ways", expected, result, 0.0001);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:97: error: cannot find symbol
Assert.assertEquals("getGPA returns the correct GPA after it has been updated", expected, result, 0.0001);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:107: error: cannot find symbol
Assert.assertEquals("getCredits returns the correct number of total credits taken", expected, result);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:118: error: cannot find symbol
Assert.assertEquals("reset correctly resets the total gpa", expected, result, 0);
^
symbol: variable Assert
location: class GPACalculatorTest
GPACalculatorTest.java:129: error: cannot find symbol
Assert.assertEquals("reset correctly resets the total gpa", expected, result);
^
symbol: variable Assert
location: class GPACalculatorTest
27 errors

----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.

Answer 1

Your code is correct, as you have correct static imports in test class. However this is a configuration issue.. please search on internet on how to configure junit in jgrasp..

I can not debug the complete issue here, but as a starting point, the junit dependency should be present in your class path. If you check the project properties, in the build path, the junit jar should be present and then only the junits can be run.. if this doesn't resolve the issue, please search on configuring junits in jgrasp, or alternatively, try creating a junit test class by going file ->new and then pasting your code into that.. Thanks!