Thread: AssertionFailedError: Expected <1> but was <0>

Hey guys, I've been having this trouble with the error from my code, debugging doesn't work, but debugs keeps telling me it's because of a ClassNotFoundException which I don't know where to handle it. Anyone know how to fix the error and handle the exception here?

My code:

import junit.framework.TestCase;
import java.util.*;


public class PushPopTest extends TestCase {

public void testExecute() throws Exception {


Stack<Integer> s = new Stack<Integer>();
SymbolTable st = new SymbolTable();
int count = 0;
Push pp = new Push("5");
pp.execute(count,s,st);
assertEquals(1,count); --> AssertionFailedError here ( Expected <1> but was <0>)
assertEquals(5, (int)s.peek());


Pop po = new Pop("x");
po.execute(count, s, st);
assertEquals(2, count);
assertTrue(s.empty());
assertEquals(5, st.getValue("x"));
}

}

import java.util.Stack;


public class Push implements Operation {

String val;

public Push(String value)
{
//this.com = command;
this.val = value;

}


@Override
public int execute(int programCounter, Stack<Integer> stack,
SymbolTable symbolTable) {

if (!(val == null) && !(val.equals("")))
{

if (val.matches("-?\\d+")) //if the value is an integer
{
stack.push(Integer.parseInt(val));
programCounter++;

}
else //if the value is not an integer
{
stack.push(symbolTable.getValue(val)); //use symboltable to check the value
programCounter++;

}

}
else
{
//throw new Exception();
}

return programCounter;
}

}

public class SymbolTable
{
/**
* Creates a SymbolTable.
*/
String na;
int val;
public SymbolTable()
{
//na = "";
//val = 0;
}

/**
* Sets the value of the given variable.
* @param name the name
* @param value the value
*/
public void setValue(String name, int value)
{
na = name;
val = value;
}

/**
* Returns the value of the given variable.
*
* @param name the name
* @return the value
* @throws RuntimeException if the variable is not defined
*/
public int getValue(String name)
{
if (!(na.equals(name)))
{
throw new RuntimeException();
}
return val;
}
}

http://www.javaprogrammingforums.com...ease-read.html <--- please read on how to correctly post your code.

Use "try catch" blocks to handle the exception.

The assertion failed error comes from here; Assert (JUnit API)

Originally Posted by http://junit.sourceforge.net/junit3.8.1/javadoc/junit/framework/Assert.html

assertEquals

public static void assertEquals(int expected,
int actual)
Asserts that two ints are equal.

You initialise count to 0, then you never change that value. You assert that it is expected to be 1. The method is behaving correctly.

Yes, I intialized count as 0, but I passed it into execute() from Push class as a programcounter, programcounter increments everytime stach push a value. But I don't know why count is not incremented after I push a value onto a stack...

Hi Junky, could you explain more about this? I am still confused. Thanks!

Thanks Junky! That explains it perfectly.
How should I increment count in the right way? Could you give me a hint? Much appreciate it!

class Foo {
    public static void main(String[] args) {
        int num = 10;
        num = doubleUp(num);
        System.out.println(num);
    }
 
    public static int doubleUp(int num) {
        return = num * 2;
    }
}

Can you see the difference between this one and what Junky posted?