fix: ensure page info cursors match the first and last edge cursors

lib/absinthe/relay/connection.ex

@@ -566,7 +566,9 @@ defmodule Absinthe.Relay.Connection do
     offset = offset || 0
     first = offset_to_cursor(offset)
     edge = build_edge(item, first)
-    {edges, last} = do_build_cursors(items, offset + 1, [edge], first)
+    {edges, _} = do_build_cursors(items, offset + 1, [edge], first)
+    first = edges |> List.first() |> get_in([:cursor])
+    last = edges |> List.last() |> get_in([:cursor])
     {edges, first, last}
   end
 

test/lib/absinthe/relay/connection_test.exs

@@ -578,12 +578,25 @@ defmodule Absinthe.Relay.ConnectionTest do
 
   describe "when provided with a cursor as an edge arg" do
     setup do
-      [record: {%{name: "Dan"}, %{role: "contributor", cursor: "custom_cursor"}}]
-    end
-
-    test "it will override the default cursor", %{record: record} do
-      {:ok, %{edges: [%{cursor: cursor} | _]}} = Connection.from_list([record], %{first: 1})
-      assert cursor == "custom_cursor"
+      [
+        records: [
+          {%{name: "Dan"}, %{role: "contributor", cursor: "first_custom_cursor"}},
+          {%{name: "Bob"}, %{role: "contributor", cursor: "end_custom_cursor"}}
+        ]
+      ]
+    end
+
+    test "it will override the default cursor", %{records: records} do
+      assert(
+        {:ok,
+         %{
+           edges: [%{cursor: "first_custom_cursor"}, %{cursor: "end_custom_cursor"}],
+           page_info: %{
+             start_cursor: "first_custom_cursor",
+             end_cursor: "end_custom_cursor"
+           }
+         }} = Connection.from_list(records, %{first: 2})
+      )
     end
   end
 

test/lib/absinthe/relay/schema_test.exs

@@ -155,7 +155,6 @@ defmodule Absinthe.Relay.SchemaTest do
     end
   end
 
-
   defmodule SchemaCustomIdType do
     use Absinthe.Schema
     use Absinthe.Relay.Schema, :classic