diff --git a/test/runtests.jl b/test/runtests.jl
index 580e1c5..09395b9 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -21,6 +21,7 @@ const TOPICS = [
     "topology",
     "geometry",
     "mesh",
+    "io",
     "quadrature",
     "domains/continuum",
     "domains/heat",