diff --git a/test/outlook/internaltree_test.exs b/test/outlook/internaltree_test.exs
index 84bb02b..e902766 100644
--- a/test/outlook/internaltree_test.exs
+++ b/test/outlook/internaltree_test.exs
@@ -7,7 +7,7 @@ defmodule Outlook.InternalTreeTest do
     alias Outlook.InternalTree
     alias Outlook.InternalTree.{InternalNode,TranslationUnit}
 
-    @default_uuid "11111111-1111-1111-1111-111111111111"
+    @default_nid "xxxxxx"
 
     test "partition_text/1 returns correctly partitioned text without overlapping markup" do
       tree = [
@@ -15,13 +15,13 @@ defmodule Outlook.InternalTreeTest do
           name: "p",
           attributes: %{},
           type: :element,
-          uuid: "8293da39-18e3-4695-8ec5-a3a4a06f006c",
+          nid: "8293da39-18e3-4695-8ec5-a3a4a06f006c",
           content: [
             %InternalNode{
               name: "",
               attributes: %{},
               type: :text,
-              uuid: "1b62b02f-0be1-4ba1-88a1-0f08f5a5254d",
+              nid: "1b62b02f-0be1-4ba1-88a1-0f08f5a5254d",
               content: "A sentence with many letters ",
               eph: %{sibling_with: :inline}
             },
@@ -34,7 +34,7 @@ defmodule Outlook.InternalTreeTest do
                   name: "",
                   attributes: %{},
                   type: :text,
-                  uuid: "c6816bfe-a660-436b-84ab-64d92417e321",
+                  nid: "c6816bfe-a660-436b-84ab-64d92417e321",
                   content: "and many, many ",
                   eph: %{sibling_with: :inline}
                 },
@@ -47,7 +47,7 @@ defmodule Outlook.InternalTreeTest do
                       name: "",
                       attributes: %{},
                       type: :text,
-                      uuid: "abcd5893-d062-4716-9979-4bf1f65d5e17",
+                      nid: "abcd5893-d062-4716-9979-4bf1f65d5e17",
                       content: "words. A",
                       eph: %{sibling_with: :inline}
                     }
@@ -58,7 +58,7 @@ defmodule Outlook.InternalTreeTest do
                   name: "",
                   attributes: %{},
                   type: :text,
-                  uuid: "d67f41fe-678a-4e27-99da-00d38decde75",
+                  nid: "d67f41fe-678a-4e27-99da-00d38decde75",
                   content: " sentence",
                   eph: %{sibling_with: :inline}
                 }
@@ -69,7 +69,7 @@ defmodule Outlook.InternalTreeTest do
               name: "",
               attributes: %{},
               type: :text,
-              uuid: "6fc0bf77-4dc6-4828-866e-2933d393f4b9",
+              nid: "6fc0bf77-4dc6-4828-866e-2933d393f4b9",
               content: " with many letters and many, many words. ",
               eph: %{sibling_with: :inline}
             }
@@ -78,12 +78,12 @@ defmodule Outlook.InternalTreeTest do
         }
       ]
 
-      assert InternalTree.partition_text(tree) |> unify_uuids_in_tunits() == [
-        %InternalNode{name: "p", attributes: %{}, type: :element, uuid: "8293da39-18e3-4695-8ec5-a3a4a06f006c",
+      assert InternalTree.partition_text(tree) |> unify_nids_in_tunits() == [
+        %InternalNode{name: "p", attributes: %{}, type: :element, nid: "8293da39-18e3-4695-8ec5-a3a4a06f006c",
           content: [
-            %TranslationUnit{status: :untranslated, uuid: @default_uuid,
+            %TranslationUnit{status: :untranslated, nid: @default_nid,
               content: "A sentence with many letters <a href=\"dingsda.com\">and many, many <b>words. </b></a>"},
-            %TranslationUnit{status: :untranslated, uuid: @default_uuid,
+            %TranslationUnit{status: :untranslated, nid: @default_nid,
               content: "<a href=\"dingsda.com\"><b>A</b> sentence</a> with many letters and many, many words. "}
           ],
           eph: %{sibling_with: :block}
@@ -97,13 +97,13 @@ defmodule Outlook.InternalTreeTest do
           name: "p",
           attributes: %{},
           type: :element,
-          uuid: "0248aec7-c525-483d-a472-40a34488478d",
+          nid: "0248aec7-c525-483d-a472-40a34488478d",
           content: [
             %InternalNode{
               name: "",
               attributes: %{},
               type: :text,
-              uuid: "d35ac56f-bf10-47b1-af19-152e6225bb32",
+              nid: "d35ac56f-bf10-47b1-af19-152e6225bb32",
               content: "F. William Engdahl is 3.7 times more likely to write a good article than Mike Adams. But this doesn't mean anything bad about Mike.",
               eph: %{sibling_with: :inline}
             }
@@ -111,21 +111,21 @@ defmodule Outlook.InternalTreeTest do
           eph: %{sibling_with: :block}
         }
       ]
-      assert InternalTree.partition_text(tree) |> unify_uuids_in_tunits() == [
+      assert InternalTree.partition_text(tree) |> unify_nids_in_tunits() == [
         %InternalNode{
           name: "p",
           attributes: %{},
           type: :element,
-          uuid: "0248aec7-c525-483d-a472-40a34488478d",
+          nid: "0248aec7-c525-483d-a472-40a34488478d",
           content: [
             %TranslationUnit{
               status: :untranslated,
-              uuid: @default_uuid,
+              nid: @default_nid,
               content: "F. William Engdahl is 3.7 times more likely to write a good article than Mike Adams. "
             },
             %TranslationUnit{
               status: :untranslated,
-              uuid: @default_uuid,
+              nid: @default_nid,
               content: "But this doesn't mean anything bad about Mike."
             }
           ],
diff --git a/test/support/internal_tree_test_helpers.ex b/test/support/internal_tree_test_helpers.ex
index 9e4f33a..0587cc9 100644
--- a/test/support/internal_tree_test_helpers.ex
+++ b/test/support/internal_tree_test_helpers.ex
@@ -1,28 +1,28 @@
 defmodule Outlook.InternalTreeTestHelpers do
 
-  @default_uuid "11111111-1111-1111-1111-111111111111"
+  @default_nid "xxxxxx"
 
   alias Outlook.InternalTree.{InternalNode,TranslationUnit}
-  @doc "Set uuids to default value to make test results predictable."
-  def unify_uuids_in_tunits([ %TranslationUnit{} = node | rest ]) do
+  @doc "Set nids to default value to make test results predictable."
+  def unify_nids_in_tunits([ %TranslationUnit{} = node | rest ]) do
     [
       %TranslationUnit{node |
-        uuid: @default_uuid,
-        content: String.replace(node.content, ~r/ uuid=""/, "")
+        nid: @default_nid,
+        content: String.replace(node.content, ~r/ nid=""/, "")
         }
-      | unify_uuids_in_tunits(rest) ]
+      | unify_nids_in_tunits(rest) ]
   end
 
-  def unify_uuids_in_tunits([ %InternalNode{type: :element} = node | rest ]) do
+  def unify_nids_in_tunits([ %InternalNode{type: :element} = node | rest ]) do
     [ %InternalNode{node |
-        content: unify_uuids_in_tunits(node.content)
+        content: unify_nids_in_tunits(node.content)
       }
-    | unify_uuids_in_tunits(rest) ]
+    | unify_nids_in_tunits(rest) ]
   end
 
-  def unify_uuids_in_tunits([ %InternalNode{} = node | rest ]) do
-    [ node | unify_uuids_in_tunits(rest) ]
+  def unify_nids_in_tunits([ %InternalNode{} = node | rest ]) do
+    [ node | unify_nids_in_tunits(rest) ]
   end
 
-  def unify_uuids_in_tunits([]), do: []
+  def unify_nids_in_tunits([]), do: []
 end