public void CopyTo()
{
IApiKeyService service = GetService();
string retrieved = service[_appId];
KeyValuePair <string, string>[] cache = new KeyValuePair <string, string> [1];
service.CopyTo(cache, 0);
Assert.NotNull(cache);
Assert.NotEmpty(cache);
Assert.Single(cache);
Assert.Equal(retrieved, cache[0].Value);
Assert.Equal(_appId, cache[0].Key);
}