feat: update text reversal test to include multi-word input

tests/test_text_reversal_tool.py

@@ -2,7 +2,7 @@ import pytest
 from src.text_reversal_tool import reverse_text
 
 def test_reverse_text():
-    assert reverse_text("hello") == "olleh"
+    assert reverse_text("hello hi 12345") == "54321 ih olleh"
     assert reverse_text("world") == "dlrow"
     assert reverse_text("") == ""
     assert reverse_text("madam") == "madam"