/// <summary>
/// Test CopyTo.
/// </summary>
/// <typeparam name="TKey">Key type of the dictionary.</typeparam>
/// <typeparam name="TValue">Value type of the dictionary.</typeparam>
/// <param name="dictionary">The dictionary to test.</param>
/// <param name="key">Key that is present in the dictionary.</param>
/// <param name="value">Value associated with the key in the dictionary.</param>
private static void TestDictionaryCopyTo <TKey, TValue>(PersistentDictionary <TKey, TValue> dictionary, TKey key, TValue value)
where TKey : IComparable <TKey>
{
var kvp = new KeyValuePair <TKey, TValue>(key, value);
var elements = new KeyValuePair <TKey, TValue> [1];
dictionary.CopyTo(elements, 0);
Assert.AreEqual(kvp, elements[0], "CopyTo failed");
var keys = new TKey[1];
dictionary.Keys.CopyTo(keys, 0);
Assert.AreEqual(key, keys[0], "Keys.CopyTo failed");
var values = new TValue[1];
dictionary.Values.CopyTo(values, 0);
Assert.AreEqual(value, values[0], "values.CopyTo failed");
}