introduce text aggregators

tests/test_simple_text_aggregator.py

@@ -0,0 +1,29 @@
+#
+# Copyright (c) 2024-2025 Daily
+#
+# SPDX-License-Identifier: BSD 2-Clause License
+#
+
+import unittest
+
+from pipecat.utils.text.simple_text_aggregator import SimpleTextAggregator
+
+
+class TestSimpleTextAggregator(unittest.IsolatedAsyncioTestCase):
+    def setUp(self):
+        self.aggregator = SimpleTextAggregator()
+
+    async def test_reset_aggregations(self):
+        assert self.aggregator.aggregate("Hello ") == None
+        assert self.aggregator.text == "Hello "
+        self.aggregator.reset()
+        assert self.aggregator.text == ""
+
+    async def test_simple_sentence(self):
+        assert self.aggregator.aggregate("Hello ") == None
+        assert self.aggregator.aggregate("Pipecat!") == "Hello Pipecat!"
+        assert self.aggregator.text == ""
+
+    async def test_multiple_sentences(self):
+        assert self.aggregator.aggregate("Hello Pipecat! How are ") == "Hello Pipecat!"
+        assert self.aggregator.aggregate("you?") == " How are you?"