migrate to reveal 3.2; add tests for all themes
diff --git a/tests/testthat.R b/tests/testthat.R
new file mode 100644
index 0000000..e6bfcd1
--- /dev/null
+++ b/tests/testthat.R
@@ -0,0 +1,4 @@
+library(testthat)
+library(revealjs)
+
+test_check("revealjs")