public void CopyToTests()
{
var testContext = _propertyTestData.GetContext();
var x = new ConfigurationDictionary <IChildElement>(null, testContext.ChildConfigurationDictionaryPropertyDef,
testContext.Configuration.ConfigurationRoot, new ConfigurationObjectSettings());
var a = testContext.GetChildElement("a");
var b = testContext.GetChildElement("b");
var c = testContext.GetChildElement("c");
x.AddCopy("a", a);
x.AddCopy("b", b);
x.AddCopy("c", c);
var array = new KeyValuePair <string, IChildElement> [3];
x.CopyTo(array, 0);
Assert.Equal(a, array[0].Value, ConfigurationObjectComparer.Instance);
Assert.Equal(b, array[1].Value, ConfigurationObjectComparer.Instance);
Assert.Equal(c, array[2].Value, ConfigurationObjectComparer.Instance);
Assert.Throws <ArgumentException>(() => x.CopyTo(array, 1));
Assert.Throws <ArgumentOutOfRangeException>(() => x.CopyTo(array, -1));
array = new KeyValuePair <string, IChildElement> [2];
Assert.Throws <ArgumentException>(() => x.CopyTo(array, 0));
x.Dispose();
Assert.Throws <ObjectDisposedException>(() => x.CopyTo(array, 0));
}