@Test
public void
it_builds_a_tree_from_a_file() throws Exception{

   Assertions.assertThat(
     Tree.Builder.aTreeBuilder()
       .withRow(Lists.newArrayList(3))
       .withRow(Lists.newArrayList(7, 4))
       .withRow(Lists.newArrayList(2, 4, 6))
       .withRow(Lists.newArrayList(8, 5, 9, 3)).build()).isEqualTo(
     TreeParser.parseTree(Paths.get(ClassLoader.getSystemResource("SmallTree.txt").toURI())));
}