@Test
public void testUpdateFirstLevelEntry() {

  SourceEntry entry = sourceType.createSourceEntryForUri("firstLevel");
  tree.updateEntry(entry);
  ObservableList<TreeItem<SourceEntry>> children = root.getChildren();
  assertEquals(1, children.size(), "Should be 1 child");
  TreeItem<SourceEntry> child = children.get(0);
  assertAll("", () -> {
    assertEquals("firstLevel", child.getValue().getName());
  });
}