public static void TestICollection_Negative()
{
ICollection dictionary = new NonBlocking.ConcurrentDictionary <int, int>();
Assert.False(dictionary.IsSynchronized, "TestICollection: FAILED. IsSynchronized returned true!");
Assert.Throws <NotSupportedException>(() => { var obj = dictionary.SyncRoot; });
// "TestICollection: FAILED. SyncRoot property didn't throw");
Assert.Throws <ArgumentNullException>(() => dictionary.CopyTo(null, 0));
// "TestICollection: FAILED. CopyTo didn't throw ANE when null Array is passed");
Assert.Throws <ArgumentOutOfRangeException>(() => dictionary.CopyTo(new object[] { }, -1));
// "TestICollection: FAILED. CopyTo didn't throw AORE when negative index passed");
//add one item to the dictionary
((NonBlocking.ConcurrentDictionary <int, int>)dictionary).TryAdd(1, 1);
Assert.Throws <ArgumentException>(() => dictionary.CopyTo(new object[] { }, 0));
// "TestICollection: FAILED. CopyTo didn't throw AE when the Array size is smaller than the dictionary count");
}