public async Task Index_UpdateOrganisationPostAddsOrganisationAndReturnsRedirect()
{
var organisationName = "org1";
var tradingName = "trading1";
var result = await _controller.UpdateOrganisation(new OrganisationViewModel { OrganisationName = organisationName, TradingName = tradingName });
await _partyRespository.Received().AddOrganisation(Arg.Is <Organisation>(o => o.OrganisationName == organisationName && o.TradingName == tradingName));
Assert.IsTrue(result is RedirectToActionResult);
}