diff --git a/tests/datasets/multiple-roots-tree-after-ancestors.xml b/tests/datasets/multiple-roots-tree-after-ancestors.xml
new file mode 100644
index 0000000..48d654e
--- /dev/null
+++ b/tests/datasets/multiple-roots-tree-after-ancestors.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dataset>
+    <multiple_roots_tree id="23" tree="23" lft="1" rgt="44" depth="0" name="Root 2"/>
+    <multiple_roots_tree id="31" tree="23" lft="16" rgt="29" depth="1" name="Node 2"/>
+    <multiple_roots_tree id="32" tree="23" lft="17" rgt="22" depth="2" name="Node 2.1"/>
+</dataset>
diff --git a/tests/datasets/tree-after-ancestors.xml b/tests/datasets/tree-after-ancestors.xml
new file mode 100644
index 0000000..9737f92
--- /dev/null
+++ b/tests/datasets/tree-after-ancestors.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dataset>
+    <tree id="1" lft="1" rgt="44" depth="0" name="Root"/>
+    <tree id="9" lft="16" rgt="29" depth="1" name="Node 2"/>
+    <tree id="10" lft="17" rgt="22" depth="2" name="Node 2.1"/>
+</dataset>