public async Task GetPhotosHandlesNullResponse()
{
_requestBuilderMock
.Setup(m => m.AddPath("photos"))
.Returns(_requestBuilderMock.Object);
_requestBuilderMock
.Setup(m => m.AddQueryParameter(It.IsAny <string>(), It.IsAny <string>()))
.Returns(_requestBuilderMock.Object);
_requestBuilderMock
.Setup(m => m.MakeRequest <PhotosResponse>())
.ReturnsAsync((PhotosResponse)null);
Assert.Empty(await _rover.GetPhotosAsync());
}