public async Task Returns_null_if_no_provider_is_set()
{
var provider = new HotSwapAvatarProvider();
var image = await provider.GetAvatarAsync(_email, _name, 16);
Assert.Null(image);
}
public async Task Returns_the_same_image_as_the_wrapped_provider()
{
var provider = new HotSwapAvatarProvider();
var inner = Substitute.For <IAvatarProvider>();
provider.Provider = inner;
inner.GetAvatarAsync(_email, _name, _size).Returns(_img);
var result = await provider.GetAvatarAsync(_email, _name, _size);
Assert.AreSame(_img, result);
}