public async Task ShouldFillServersList_WhenInitializeAsync()
{
//arrange
var servers = new ObservableCollection <Server>
{
new Server {
Country = "Ukraine", Distance = 1000, Number = 1
},
new Server {
Country = "Ukraine", Distance = 500, Number = 2
},
new Server {
Country = "Italy", Distance = 500, Number = 1
},
};
_serversServiceMock.Setup(x => x.GetServersAsync(It.IsAny <string>(), It.IsAny <string>())).Returns(Task.FromResult(servers));
var serversPageViewModel = new ServersPageViewModel(_navigationServiceMock.Object,
_serversServiceMock.Object, _settingsServiceMock.Object);
//act
await serversPageViewModel.InitializeAsync(null);
//assert
CollectionAssert.AreEqual(servers, serversPageViewModel.Servers);
}
public async Task ShouldNavigateToErrorPageAsync_WhenInitializeAsyncThroException()
{
//arrange
_serversServiceMock.Setup(x => x.GetServersAsync(It.IsAny <string>(), It.IsAny <string>())).Throws <Exception>();
var serversPageViewModel = new ServersPageViewModel(_navigationServiceMock.Object,
_serversServiceMock.Object, _settingsServiceMock.Object);
//act
await serversPageViewModel.InitializeAsync(null);
//assert
_navigationServiceMock.Verify(x => x.NavigateToErrorPageAsync(It.IsAny <NavigationData>()), Times.Once);
}
public async Task ShouldNavigateToPreviousPage_WhenOkCommand()
{
//arrange
var errorViewModel = new ErrorPageViewModel(_navigationServiceMock.Object);
var navigateFromPage = new ServersPageViewModel(_navigationServiceMock.Object, _serversServiceMock.Object,
_settingsServiceMock.Object);
await errorViewModel.InitializeAsync(new ErrorPageNavigationData
{
NavigatedFromPage = navigateFromPage
});
//act
errorViewModel.OkCommand.Execute(null);
//assert
_navigationServiceMock.Verify(x => x.NavigateToPageAsync(navigateFromPage, It.IsAny <NavigationData>()), Times.Once);
}