diff --git a/test.sh b/test.sh
index 04ae548..34bde3f 100755
--- a/test.sh
+++ b/test.sh
@@ -119,6 +119,18 @@ EOF
 expecting <<EOF
 EOF
 
+when_run <<EOF "only spaces returns nothing"
+
+EOF
+expecting <<EOF
+EOF
+
+when_run <<EOF "only tabs returns nothing"
+
+EOF
+expecting <<EOF
+EOF
+
 when_run <<EOF "simple commands are run"
 echo no files:
 ls -a