diff --git a/tests/testthat.R b/tests/testthat.R
index eb84667..d6562c5 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -1,4 +1,7 @@
-library(testthat)
-library(triangle)
+if (require(testthat)) {
+  library(triangle)
 
-test_check("triangle")
+  test_check("triangle")
+} else {
+  cat("\ntestthat is not available\n")
+}