public void CanGoBack_IsTrueIfTwoPagesNavigated()
{
NavigationStackWithHome navigationStack = new NavigationStackWithHome();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
navigationStack.NavigateTo(new PageInfo("Page 2", null));
Assert.Equal(true, navigationStack.CanGoBack);
}
public void CanGoBack_IsFalseIfTwoPageNavigatedThenBack()
{
NavigationStackWithHome navigationStack = new NavigationStackWithHome();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
navigationStack.NavigateTo(new PageInfo("Page 2", null));
navigationStack.GoBack();
Assert.Equal(false, navigationStack.CanGoBack);
}
public void GoBack_ThrowsException_SinglePageInBackStack()
{
NavigationStackWithHome navigationStack = new NavigationStackWithHome();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
var e = Assert.Throws<InvalidOperationException>(() => navigationStack.GoBack());
Assert.Equal("You cannot navigate backwards as the back stack is empty.", e.Message);
}
public void PropertyChanged_CanGoBack_IsCalledWhenSecondPageNavigated()
{
NavigationStackWithHome navigationStack = new NavigationStackWithHome();
navigationStack.NavigateTo(new PageInfo("Page 1", null));
int changedCount = 0;
navigationStack.PropertyChanged += delegate (object sender, PropertyChangedEventArgs e) { if (e.PropertyName == "CanGoBack") changedCount++; };
navigationStack.NavigateTo(new PageInfo("Page 2", null));
Assert.Equal(1, changedCount);
}