next and previous links fixed up
diff --git a/user_guide/libraries/unit_testing.html b/user_guide/libraries/unit_testing.html
index 401876b..3941a7d 100644
--- a/user_guide/libraries/unit_testing.html
+++ b/user_guide/libraries/unit_testing.html
@@ -201,7 +201,7 @@
·
<a href="#top">Top of Page</a> ·
<a href="../index.html">User Guide Home</a> ·
-Next Topic: <a href="validation.html">Validation Class</a>
+Next Topic: <a href="uri.html">URI Class</a>
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