5 files changed, 113 insertions, 5 deletions
diff --git a/src/packrat-graphs.adb b/src/packrat-graphs.adb
index 1206a89..1411259 100644
--- a/src/packrat-graphs.adb
+++ b/src/packrat-graphs.adb
@@ -471,7 +471,7 @@ package body Packrat.Graphs is
     begin
         return Result : Reversible_Iterator do
             Result.My_Container := This'Unrestricted_Access;
-            Result.My_Position := No_Position;
+            Result.My_Position := Cursor (No_Position);
         end return;
     end Iterate;
 
@@ -483,7 +483,7 @@ package body Packrat.Graphs is
     begin
         return Result : Reversible_Iterator do
             Result.My_Container := This'Unrestricted_Access;
-            Result.My_Position := No_Position;
+            Result.My_Position := Cursor (No_Position);
         end return;
     end Iterate_Subtree;
 
@@ -495,7 +495,7 @@ package body Packrat.Graphs is
     begin
         return Result : Forward_Iterator do
             Result.My_Container := This'Unrestricted_Access;
-            Result.My_Position := No_Position;
+            Result.My_Position := Cursor (No_Position);
         end return;
     end Iterate_Choice;
 
diff --git a/src/packrat-graphs.ads b/src/packrat-graphs.ads
index 877be3a..0ef298e 100644
--- a/src/packrat-graphs.ads
+++ b/src/packrat-graphs.ads
@@ -33,7 +33,7 @@ package Packrat.Graphs is
 
 
 
-    No_Position : constant Cursor;
+    No_Position : constant My_Interfaces.Cursor'Class;
 
     Empty_Graph : constant Parse_Graph;
 
@@ -339,7 +339,8 @@ private
 
     No_Node : constant Node := (My_Interfaces.Node with null record);
 
-    No_Position : constant Cursor := (My_Interfaces.Cursor with null record);
+    No_Position_Actual : constant Cursor := (My_Interfaces.Cursor with null record);
+    No_Position : constant My_Interfaces.Cursor'Class := No_Position_Actual;
 
     Empty_Graph : constant Parse_Graph := (My_Interfaces.Graph with null record);
 
diff --git a/test/ratnest-tests.adb b/test/ratnest-tests.adb
index 3d51081..5153b9f 100644
--- a/test/ratnest-tests.adb
+++ b/test/ratnest-tests.adb
@@ -6,6 +6,7 @@ with
     Ada.Strings.Maps,
     Ada.Exceptions,
     Packrat.Lexer.Debug,
+    Packrat.Graphs,
     Packrat.Util;
 
 
@@ -1240,6 +1241,87 @@ package body Ratnest.Tests is
 
 
 
+    package body Graphs is
+
+
+        type My_Labels is (One, Two, Three, Four, Five, Six);
+
+        package My_Interfaces is new Packrat.Interfaces (My_Labels, Character, String);
+        package My_Graphs is new Packrat.Graphs (My_Labels, Character, String, My_Interfaces);
+
+
+        use type My_Interfaces.Cursor;
+        use type My_Graphs.Parse_Graph;
+
+
+        function Node_Check
+            return Test_Result
+        is
+            Leafeon   : My_Graphs.Node := My_Graphs.Leaf ("abc", 1, 3);
+            Brancheon : My_Graphs.Node := My_Graphs.Branch (One, 4, 3);
+        begin
+            if  Leafeon.Elements /= "abc" or Brancheon.Label /= One or
+                Leafeon.Start /= 1 or Brancheon.Start /= 4 or
+                Leafeon.Finish /= 3 or Brancheon.Finish /= 3
+            then
+                return Fail;
+            end if;
+            return Pass;
+        end Node_Check;
+
+
+        function Cursor_Check
+            return Test_Result is
+        begin
+            return Fail;
+        end Cursor_Check;
+
+
+        function Empty_Check
+            return Test_Result is
+        begin
+            if not My_Graphs.Empty_Graph.Is_Empty or not My_Graphs.No_Position.Is_Nothing then
+                return Fail;
+            end if;
+            return Pass;
+        end Empty_Check;
+
+
+        function Attachment_Check
+            return Test_Result is
+        begin
+            return Fail;
+        end Attachment_Check;
+
+
+        function Find_Check
+            return Test_Result
+        is
+            Leafeon   : My_Graphs.Parse_Graph := My_Graphs.Singleton (My_Graphs.Leaf ("abc", 1, 3));
+            Brancheon : My_Graphs.Parse_Graph := My_Graphs.Singleton (My_Graphs.Branch (One, 1, 5));
+            Combined  : My_Graphs.Parse_Graph := Brancheon;
+        begin
+            Combined.Attach_Choice (Combined.Root (1), Leafeon);
+            declare
+                Expected_Result : My_Interfaces.Cursor'Class := Combined.Root (1).First_Child;
+            begin
+                if  Combined.Find ("abc") /= Expected_Result or
+                    Combined.Find ("def") /= My_Graphs.No_Position or
+                    Brancheon.Find ("any") /= My_Graphs.No_Position
+                then
+                    return Fail;
+                end if;
+            end;
+            return Pass;
+        end Find_Check;
+
+
+    end Graphs;
+
+
+
+
+
     package body Util is
 
 
diff --git a/test/ratnest-tests.ads b/test/ratnest-tests.ads
index e72bfe7..b8efd8d 100644
--- a/test/ratnest-tests.ads
+++ b/test/ratnest-tests.ads
@@ -120,6 +120,27 @@ package Ratnest.Tests is
 
 
 
+    package Graphs is
+
+        function Node_Check return Test_Result;
+        function Cursor_Check return Test_Result;
+
+        function Empty_Check return Test_Result;
+        function Attachment_Check return Test_Result;
+        function Find_Check return Test_Result;
+
+        Graph_Tests : Test_Array :=
+           ((+"Node", Node_Check'Access),
+            (+"Cursor", Cursor_Check'Access),
+            (+"Emptiness", Empty_Check'Access),
+            (+"Attachment", Attachment_Check'Access),
+            (+"Find", Find_Check'Access));
+
+    end Graphs;
+
+
+
+
     package Util is
 
         function In_Set_Check return Test_Result;
diff --git a/test/test_main.adb b/test/test_main.adb
index b87dda5..c741a93 100644
--- a/test/test_main.adb
+++ b/test/test_main.adb
@@ -48,6 +48,10 @@ begin
     Run_Tests (Lexer.Lexer_Tests);
     New_Line;
 
+    Put_Line ("Running tests for Packrat.Graphs...");
+    Run_Tests (Graphs.Graph_Tests);
+    New_Line;
+
     Put_Line ("Running tests for Packrat.Util...");
     Put_Line ("Testing set predicates...");
     Run_Tests (Util.Set_Predicate_Tests);