2 Why We Need Model-Based Testing

Systems with Complex State 195
using System.Collections.Generic;
namespace BagImpl
{
public class BagImpl
{
Dictionary table = new Dictionary();
int count = 0;
}
}
public int Lookup(string element)
{
int c = 0;
table.TryGetValue(element, out c);
return c;
}
public void Add(string element)
{
if (table.ContainsKey(element))
table[element] += 1;
else
table[element] = 1;
count += 1;
}
public void Delete(string element)
{
if (table.ContainsKey(element))
{
table[element] -= 1;
count -= 1;
}
}
public int Count
{
get
{
return count;
}
}
Figure 12.1. Bag implementation.
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