/// <summary>
/// Verifies that all elements in the specified collection are instances of the specified type. The assertion
/// fails if there exists one element in the collection for which the specified type is not found in its
/// inheritance hierarchy.
/// </summary>
public static void AllItemsAreInstancesOfType(ICollection collection, Type expectedType,
string message = null, params object[] parameters)
{
if (collection == null)
{
throw new NullTestArgumentException("collection");
}
if (expectedType == null)
{
throw new NullTestArgumentException("expectedType");
}
int index = 0;
foreach (object item in collection)
{
if (item == null)
{
throw new AssertFailedException("Element at index {0} is (null). Expected type: <{1}>.".Format(index, expectedType.FullName), message, parameters);
}
if (!Assert.CheckIsInstanceOfType(item, expectedType))
{
throw new AssertFailedException(
"Element at index {0} is not of expecteds type. Expected type: {1}. Actual type: {2}.".FormatValues(index, expectedType.FullName, item.GetType().FullName),
message, parameters);
}
index++;
}
}
