diff --git a/test/outlook/internaltree_test.exs b/test/outlook/internaltree_test.exs
new file mode 100644
index 0000000..c82ae1f
--- /dev/null
+++ b/test/outlook/internaltree_test.exs
@@ -0,0 +1,92 @@
+defmodule Outlook.InternalTreeTest do
+  use Outlook.DataCase
+
+  import Outlook.InternalTreeTestHelpers
+
+  describe "internal_tree" do
+    alias Outlook.InternalTree
+    alias Outlook.InternalTree.{InternalNode,Html,Basic,TranslationUnit}
+
+    import Outlook.ArticlesFixtures
+
+    @default_uuid "11111111-1111-1111-1111-111111111111"
+
+    test "partition_text/1 returns correctly dingens..." do
+      tree = [
+        %InternalNode{
+          name: "p",
+          attributes: %{},
+          type: :element,
+          uuid: "8293da39-18e3-4695-8ec5-a3a4a06f006c",
+          content: [
+            %InternalNode{
+              name: "",
+              attributes: %{},
+              type: :text,
+              uuid: "1b62b02f-0be1-4ba1-88a1-0f08f5a5254d",
+              content: "A sentence with many letters ",
+              eph: %{sibling_with: :inline}
+            },
+            %InternalNode{
+              name: "a",
+              attributes: %{href: "dingsda.com"},
+              type: :element,
+              content: [
+                %InternalNode{
+                  name: "",
+                  attributes: %{},
+                  type: :text,
+                  uuid: "c6816bfe-a660-436b-84ab-64d92417e321",
+                  content: "and many, many ",
+                  eph: %{sibling_with: :inline}
+                },
+                %InternalNode{
+                  name: "b",
+                  attributes: %{},
+                  type: :element,
+                  content: [
+                    %InternalNode{
+                      name: "",
+                      attributes: %{},
+                      type: :text,
+                      uuid: "abcd5893-d062-4716-9979-4bf1f65d5e17",
+                      content: "words. A",
+                      eph: %{sibling_with: :inline}
+                    }
+                  ],
+                  eph: %{sibling_with: :inline}
+                },
+                %InternalNode{
+                  name: "",
+                  attributes: %{},
+                  type: :text,
+                  uuid: "d67f41fe-678a-4e27-99da-00d38decde75",
+                  content: " sentence",
+                  eph: %{sibling_with: :inline}
+                }
+              ],
+              eph: %{sibling_with: :inline}
+            },
+            %InternalNode{
+              name: "",
+              attributes: %{},
+              type: :text,
+              uuid: "6fc0bf77-4dc6-4828-866e-2933d393f4b9",
+              content: " with many letters and many, many words. ",
+              eph: %{sibling_with: :inline}
+            }
+          ],
+          eph: %{sibling_with: :block}
+        }
+      ]
+      assert InternalTree.partition_text(tree) |> unify_uuids_in_tunits() == [
+        %InternalNode{name: "p", attributes: %{}, type: :element, uuid: "8293da39-18e3-4695-8ec5-a3a4a06f006c",
+          content: [
+            %TranslationUnit{status: :untranslated, uuid: @default_uuid,
+              content: "A sentence with many letters <a href=\"dingsda.com\">and many, many <b>words. </b></a>"},
+            %TranslationUnit{status: :untranslated, uuid: @default_uuid,
+            content: "<a href=\"dingsda.com\"><b>A</b> sentence</a> with many letters and many, many words. "}],
+            eph: %{sibling_with: :block}}]
+    end
+  end
+end
diff --git a/test/support/internal_tree_test_helpers.ex b/test/support/internal_tree_test_helpers.ex
new file mode 100644
index 0000000..9e4f33a
--- /dev/null
+++ b/test/support/internal_tree_test_helpers.ex
@@ -0,0 +1,28 @@
+defmodule Outlook.InternalTreeTestHelpers do
+
+  @default_uuid "11111111-1111-1111-1111-111111111111"
+
+  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
+    [
+      %TranslationUnit{node |
+        uuid: @default_uuid,
+        content: String.replace(node.content, ~r/ uuid=""/, "")
+        }
+      | unify_uuids_in_tunits(rest) ]
+  end
+
+  def unify_uuids_in_tunits([ %InternalNode{type: :element} = node | rest ]) do
+    [ %InternalNode{node |
+        content: unify_uuids_in_tunits(node.content)
+      }
+    | unify_uuids_in_tunits(rest) ]
+  end
+
+  def unify_uuids_in_tunits([ %InternalNode{} = node | rest ]) do
+    [ node | unify_uuids_in_tunits(rest) ]
+  end
+
+  def unify_uuids_in_tunits([]), do: []
+end