diff --git a/tests/testthat/Rplots.pdf b/tests/testthat/Rplots.pdf
new file mode 100644
index 0000000..ad7f8b0
Binary files /dev/null and b/tests/testthat/Rplots.pdf differ
diff --git a/tests/testthat/ref/ex1.Rmd b/tests/testthat/ref/ex1.Rmd
index cc13315..48daebc 100644
--- a/tests/testthat/ref/ex1.Rmd
+++ b/tests/testthat/ref/ex1.Rmd
@@ -20,7 +20,6 @@ summary(cars)
 You can also embed plots, for example:
 
 ```{r pressure, echo=FALSE}
-pdf(NULL)
 plot(pressure)
 ```