public void ThrowsArgumentNullException_When_KeyIsInvalid(string key)
{
// arrange / act
const string data = "Data";
var action = new Func <Task>(async() => await _sut.SetItemAsStringAsync(key, data));
// assert
Assert.ThrowsAsync <ArgumentNullException>(action);
}
private async Task SetCulture(string culture)
{
await LocalStorageService.SetItemAsStringAsync("culture", culture);
NavigationManager.NavigateTo(NavigationManager.Uri, forceLoad: true);
}