diff --git a/tests/testthat.R b/tests/testthat.R
index 007314e..86ba0f0 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -8,6 +8,8 @@ test_check("WGPAN")
 ID <- c("Amanita","Polyporus","Coprinus", "Daldinia", "Entoloma", "Flaviporus")
 myData<- matrix(1:36, nrow = 6, ncol = 6,  dimnames = list(ID, ID))
 diag(myData)<- 0 #set diagonal to 0
+#A pairwise distance matrix is equal along hte upper and lower triangular.  Clone the upper onto the lower.
+myData[lower.tri(myData)] <- myData[upper.tri(myData)]
 clades = c("Agaricales", "Polyporales", "Agaricales", "Xylariales", "Agaricales", "Polyporales")
 cladeList = data.frame(ID, clades)
 x<- myData