public void ReusesPreviouslyCreatedSnapshotToImprovePerformance()
{
var target = new TestableSnapshottingCollection <object>(new List <object>());
var previouslyCreatedSnapshot = new List <object>();
target.Snapshot = previouslyCreatedSnapshot;
var returnedSnapshot = target.GetSnapshot();
Assert.Same(previouslyCreatedSnapshot, returnedSnapshot);
}
public void ResetsSnapshotSoThatItsRecreatedAtNextRead()
{
var target = new TestableSnapshottingCollection <object>(new List <object> {
null
});
target.GetSnapshot();
target.Remove(null);
Assert.Null(target.Snapshot);
}
public void LocksCollectionWhileCreatingSnapshotForThreadSafety()
{
bool isCollectionLocked = false;
var target = new TestableSnapshottingCollection <object>(new List <object>());
target.OnCreateSnapshot = c =>
{
isCollectionLocked = Monitor.IsEntered(c);
return(null);
};
var dummy = target.GetSnapshot();
Assert.True(isCollectionLocked);
}
public void InvokesCreateSnapshotMethodToLetConcreteChildrenDoItEfficiently()
{
IList <object> actualCollection = null;
var expectedCollection = new List <object>();
var target = new TestableSnapshottingCollection <object>(new List <object>());
target.OnCreateSnapshot = c =>
{
actualCollection = expectedCollection;
return(null);
};
var dummy = target.GetSnapshot();
Assert.Same(expectedCollection, actualCollection);
}
