One more test

tests/unit/test_online.py

@@ -0,0 +1,23 @@
+""" Test the Ukkonen "online" builder. """
+
+# pylint: disable=missing-docstring
+
+import pytest
+
+from suffix_tree import Tree
+from suffix_tree.builder_factory import BUILDERS
+
+
+class TestOnline:
+    def test_online(self):
+        """ Test building Ukkonen from an iterator."""
+        tree = Tree()
+
+        def generator():
+            yield from "xabxac"
+            assert tree.find("xac")  # tree is always ready
+            yield from "abc"
+
+        tree.add("A", generator(), builder="ukkonen")
+        assert tree.find("xacabc")
+