Fix destory older pages when navigation from NavigationPage

Source/Xamarin/Prism.Forms.Tests/Mocks/ViewModels/ContentPageMockViewModel.cs

@@ -18,4 +18,8 @@ public bool CanNavigate(NavigationParameters parameters)
             return true;
         }
     }
+
+    public class SecondContentPageMockViewModel : ViewModelBase
+    {
+    }
 }

Source/Xamarin/Prism.Forms.Tests/Mocks/ViewModels/NavigationPageMockViewModel.cs

@@ -6,4 +6,9 @@ public class NavigationPageMockViewModel : ViewModelBase
     {
 
     }
+
+    public class NavigationPageEmptyMockViewModel : ViewModelBase
+    {
+
+    }
 }

Source/Xamarin/Prism.Forms.Tests/Mocks/ViewModels/PageMockViewModel.cs

@@ -1,6 +1,6 @@
 namespace Prism.Forms.Tests.Mocks.ViewModels
 {
-    public class PageMockViewModel
+    public class PageMockViewModel : ViewModelBase
     {
 
     }

Source/Xamarin/Prism.Forms.Tests/Mocks/Views/ContentPageMock.cs

@@ -66,4 +66,15 @@ public void Destroy()
             PageNavigationEventRecorder?.Record(this, PageNavigationEvent.Destroy);
         }
     }
+
+    public class SecondContentPageMock : ContentPageMock
+    {
+        public SecondContentPageMock()
+        {
+        }
+
+        public SecondContentPageMock(PageNavigationEventRecorder recorder) : base(recorder)
+        {
+        }
+    }
 }

Source/Xamarin/Prism.Forms.Tests/Mocks/Views/MasterDetailPageMock.cs

@@ -15,6 +15,7 @@ public MasterDetailPageMock() : this(null)
 
         public MasterDetailPageMock(PageNavigationEventRecorder recorder)
         {
+            Master = new ContentPageMock(recorder) { Title = "Master" };
             Detail = new ContentPageMock(recorder);
 
             ViewModelLocator.SetAutowireViewModel(this, true);

Source/Xamarin/Prism.Forms.Tests/Mocks/Views/NavigationPageMock.cs

@@ -1,10 +1,11 @@
-using Prism.Mvvm;
+using System.Threading.Tasks;
+using Prism.Mvvm;
 using Prism.Navigation;
 using Xamarin.Forms;
 
 namespace Prism.Forms.Tests.Mocks.Views
 {
-    public class NavigationPageMock : NavigationPage, IDestructible, IPageNavigationEventRecordable
+    public class NavigationPageMock : NavigationPage, IDestructible, IPageNavigationEventRecordable, INavigationPageOptions, INavigationAware
     {
         public bool DestroyCalled { get; private set; } = false;
         public PageNavigationEventRecorder PageNavigationEventRecorder { get; set; }
@@ -13,7 +14,11 @@ public NavigationPageMock() : this(null)
         {
         }
 
-        public NavigationPageMock(PageNavigationEventRecorder recorder) : base(new ContentPageMock(recorder))
+        public NavigationPageMock(PageNavigationEventRecorder recorder) : this(recorder, new ContentPageMock(recorder))
+        {
+        }
+
+        public NavigationPageMock(PageNavigationEventRecorder recorder, Page page) : base(page)
         {
             ViewModelLocator.SetAutowireViewModel(this, true);
 
@@ -26,13 +31,69 @@ public void Destroy()
             DestroyCalled = true;
             PageNavigationEventRecorder.Record(this, PageNavigationEvent.Destroy);
         }
+
+        public bool ClearNavigationStackOnNavigation { get; set; } = true;
+        public void OnNavigatedFrom(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatedFrom);
+        }
+
+        public void OnNavigatedTo(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatedTo);
+        }
+
+        public void OnNavigatingTo(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatingTo);
+        }
     }
 
-    public class NavigationPageEmptyMock : NavigationPage
+    public class NavigationPageEmptyMock : NavigationPage, INavigationAware, IConfirmNavigationAsync, IDestructible, IPageNavigationEventRecordable
     {
+        public PageNavigationEventRecorder PageNavigationEventRecorder { get; set; }
         public NavigationPageEmptyMock() : base()
         {
-
+
+        }
+
+        public NavigationPageEmptyMock(PageNavigationEventRecorder recorder)
+        {
+            ViewModelLocator.SetAutowireViewModel(this, true);
+
+            PageNavigationEventRecorder = recorder;
+            ((IPageNavigationEventRecordable)BindingContext).PageNavigationEventRecorder = recorder;
+        }
+
+        public void OnNavigatedFrom(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatedFrom);
+        }
+
+        public void OnNavigatedTo(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatedTo);
+        }
+
+        public void OnNavigatingTo(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatingTo);
+        }
+
+        public Task<bool> CanNavigateAsync(NavigationParameters parameters)
+        {
+            return Task.Run(() =>
+            {
+                if (parameters.ContainsKey("canNavigate"))
+                    return (bool)parameters["canNavigate"];
+
+                return true;
+            });
+        }
+
+        public void Destroy()
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.Destroy);
         }
     }
 

Source/Xamarin/Prism.Forms.Tests/Mocks/Views/PageMock.cs

@@ -1,9 +1,53 @@
-using Prism.Navigation;
+using System.Threading.Tasks;
+using Prism.Mvvm;
+using Prism.Navigation;
 using Xamarin.Forms;
 
 namespace Prism.Forms.Tests.Mocks.Views
 {
-    public class PageMock : Page
+    public class PageMock : Page, INavigationAware, IConfirmNavigationAsync, IDestructible, IPageNavigationEventRecordable
     {
+        public PageNavigationEventRecorder PageNavigationEventRecorder { get; set; }
+
+        public PageMock() : this(null)
+        {
+
+        }
+
+        public PageMock(PageNavigationEventRecorder recorder)
+        {
+            PageNavigationEventRecorder = recorder;
+        }
+
+        public void OnNavigatedFrom(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatedFrom);
+        }
+
+        public void OnNavigatedTo(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatedTo);
+        }
+
+        public void OnNavigatingTo(NavigationParameters parameters)
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.OnNavigatingTo);
+        }
+
+        public Task<bool> CanNavigateAsync(NavigationParameters parameters)
+        {
+            return Task.Run(() =>
+            {
+                if (parameters.ContainsKey("canNavigate"))
+                    return (bool)parameters["canNavigate"];
+
+                return true;
+            });
+        }
+
+        public void Destroy()
+        {
+            PageNavigationEventRecorder?.Record(this, PageNavigationEvent.Destroy);
+        }
     }
 }