public void DequeList_AllMethodsRandomized()
{
const int reps = 800;
Random r = new Random();
DequeList <int> list = new DequeList <int>();
DequeListTester <int> tester = new DequeListTester <int>();
Func <int> generator = () => { return(r.Next()); };
ActionPair[] testActions = MakeActionList <int>(generator, list, tester);
int noOfActions = 10;
for (int repNo = 0; repNo < reps; repNo++)
{
ActionPair[] trialRun = Enumerable.Range(0, noOfActions).SelectMany(i => testActions).ToArray();
ShuffleArray(trialRun);
for (int i = 0; i < noOfActions; i++)
{
bool res = false;
try
{
res = trialRun[i].TestAction();
}
catch (Exception ex)
{
Assert.Fail(String.Format("Exception caught while running test {0}. Count was {1}. Exception thrown was {2}", trialRun[i].Description, list.Count, ex.Message));
}
if (!res)
{
Assert.Fail(String.Format("The result of test {0} was failure. Count was {1}.", trialRun[i].Description, list.Count));
}
int mismatchIndex;
string message;
if (!TestEquality <int>(list, tester, Comparer <int> .Default, out mismatchIndex, out message))
{
Assert.Fail(String.Format("Equality was violated right after running the test {0}. Mismatch occurred at {1}. Message returned was {2}. Count is {3}.", trialRun[i].Description, mismatchIndex, message, list.Count));
}
}
list.Clear();
tester.Clear();
noOfActions += 2;
}
}
public void DequeList_AllMethodsIsolated()
{
Random r = new Random();
DequeList <int> list = new DequeList <int>();
DequeListTester <int> tester = new DequeListTester <int>();
int mismatchIndex;
string errorMessage;
int size = 1000;
for (int i = 0; i < size; i++)
{
int item = r.Next(0, 2 * size);
list.Add(item);
tester.Add(item);
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
for (mismatchIndex = size - 1; mismatchIndex >= 0; mismatchIndex--)
{
int item1 = list.PopRight();
int item2 = tester.PopRight();
Assert.AreEqual <int>(item1, item2, String.Format("Mismatch during PopRight of popped items at index {0}", mismatchIndex));
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
for (int i = 0; i < size; i++)
{
int item = r.Next(0, 2 * size);
list.PushRight(item);
tester.PushRight(item);
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
for (mismatchIndex = size - 1; mismatchIndex >= 0; mismatchIndex--)
{
int item1 = list.PopRight();
int item2 = tester.PopRight();
Assert.AreEqual <int>(item1, item2, String.Format("Mismatch during PopRight of popped items at index {0}", mismatchIndex));
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
for (int i = 0; i < size; i++)
{
int item = r.Next(0, 2 * size);
list.PushLeft(item);
tester.PushLeft(item);
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
for (mismatchIndex = size - 1; mismatchIndex >= 0; mismatchIndex--)
{
int item1 = list.PopLeft();
int item2 = tester.PopLeft();
Assert.AreEqual <int>(item1, item2, String.Format("Mismatch during PopLeft of popped items at index {0}", mismatchIndex));
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
for (int i = 0; i < size; i++)
{
int item = r.Next(0, 2 * size);
list.PushLeft(item);
tester.PushLeft(item);
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
while (list.Count > 0)
{
int x = r.Next(0, list.Count);
int item1 = list[x];
int item2 = tester[x];
list.RemoveAt(x);
tester.RemoveAt(x);
Assert.AreEqual <int>(item1, item2, String.Format("Mismatch during RemoveAt of popped items at index {0}", mismatchIndex));
Assert.IsTrue(TestEquality(list, tester, Comparer <int> .Default, out mismatchIndex, out errorMessage), errorMessage);
}
}
private ActionPair[] MakeActionList <T>(Func <T> generator, DequeList <T> list, DequeListTester <T> tester)
{
List <ActionPair> actionList = new List <ActionPair>();
Random r = new Random();
actionList.Add(new ActionPair("PushLeft", () =>
{
T x = generator();
list.PushLeft(x);
tester.PushLeft(x);
return(true);
}));
actionList.Add(new ActionPair("PushRight", () =>
{
T x = generator();
list.PushRight(x);
tester.PushRight(x);
return(true);
}));
actionList.Add(new ActionPair("PopLeft", () =>
{
T x1 = default(T), x2 = default(T);
bool e1 = false, e2 = false;
try { x1 = list.PopLeft(); }
catch { e1 = true; }
try { x2 = tester.PopLeft(); }
catch { e2 = true; }
if (!e1 && !e2)
{
return(x1.Equals(x2));
}
else if (e1 != e2)
{
return(false);
}
return(true);
}));
actionList.Add(new ActionPair("PopRight", () =>
{
T x1 = default(T), x2 = default(T);
bool e1 = false, e2 = false;
try { x1 = list.PopRight(); }
catch { e1 = true; }
try { x2 = tester.PopRight(); }
catch { e2 = true; }
if (!e1 && !e2)
{
return(x1.Equals(x2));
}
else if (e1 != e2)
{
return(false);
}
return(true);
}));
actionList.Add(new ActionPair("Contains", () =>
{
if (r.Next(0, 2) == 0) // check for an actually contained item
{
if (list.Count > 0)
{
int index = r.Next(0, list.Count);
T elem = list[index];
return(list.Contains(elem) && tester.Contains(elem));
}
else
{
return(true);
}
}
else
{
T elem = generator();
return(list.Contains(elem) == tester.Contains(elem));
}
}));
actionList.Add(new ActionPair("Remove", () =>
{
if (r.Next(0, 2) == 0) // check for an actually contained item
{
if (list.Count > 0)
{
int index = r.Next(0, list.Count);
T elem = list[index];
return(list.Remove(elem) == true && tester.Remove(elem));
}
else
{
return(!list.Remove(generator()));
}
}
else
{
T elem = generator();
return(list.Remove(elem) == tester.Remove(elem));
}
}));
actionList.Add(new ActionPair("IndexOf", () =>
{
if (r.Next(0, 2) == 0) // check for an actually contained item
{
if (list.Count > 0)
{
int index = r.Next(0, list.Count);
T elem = list[index];
return(list.IndexOf(elem) == index && tester.IndexOf(elem) == index);
}
else
{
return(true);
}
}
else
{
T elem = generator();
return(list.Contains(elem) == tester.Contains(elem));
}
}));
actionList.Add(new ActionPair("RemoveAt", () =>
{
if (list.Count > 0)
{
int index = r.Next(0, list.Count);
list.RemoveAt(index);
tester.RemoveAt(index);
}
return(true);
}));
actionList.Add(new ActionPair("Insert", () =>
{
int index = r.Next(0, list.Count);
T elem = generator();
try { list.Insert(index, elem); }
catch (Exception ex) { throw new Exception(String.Format("The index being inserted to was {0}. Element = {1}. Original exception message = {2}.", index, elem, ex.Message), ex); }
tester.Insert(index, elem);
return(true);
}));
actionList.Add(new ActionPair("CopyTo", () =>
{
T[] cpy1 = new T[list.Count];
T[] cpy2 = new T[tester.Count];
list.CopyTo(cpy1, 0);
tester.CopyTo(cpy2, 0);
int mismatchIndex;
string message;
return(TestEquality <T>(cpy1, cpy2, Comparer <T> .Default, out mismatchIndex, out message));
}));
return(actionList.ToArray());
}