diff --git a/tests/lib.sh b/tests/lib.sh
index 0766d85..50b0ef8 100644
--- a/tests/lib.sh
+++ b/tests/lib.sh
@@ -8,6 +8,11 @@
 
 REAL_TOP="$(readlink -f "$(dirname "$0")"/../../..)"
 
+function make_mock_top {
+  mock=$(mktemp -t -d st.XXXXX)
+  echo "$mock"
+}
+
 if [[ -n "$HARDWIRED_MOCK_TOP" ]]; then
   MOCK_TOP="$HARDWIRED_MOCK_TOP"
 else
@@ -197,3 +202,11 @@
     info "Completed test case \e[96;1m$f\e[0m"
   done
 }
+
+function move_mock_top {
+  MOCK_TOP2=$(make_mock_top)
+  rm -rf $MOCK_TOP2
+  mv $MOCK_TOP $MOCK_TOP2
+  MOCK_TOP=$MOCK_TOP2
+  trap cleanup_mock_top EXIT
+}