diff --git a/check.sh b/check.sh
index ac43138..566c1d9 100755
--- a/check.sh
+++ b/check.sh
@@ -72,6 +72,8 @@ tests='
 30-substitution-backtick
 30-substitution-assignment
 30-for-substitution
+30-substitution-assignment
+30-substitution-redirect
 
 40-eval
 40-eval-echo-variable
diff --git a/test/30-substitution-assignment.sh b/test/30-substitution-assignment.sh
index 8792ff3..816efa7 100644
--- a/test/30-substitution-assignment.sh
+++ b/test/30-substitution-assignment.sh
@@ -1,3 +1,2 @@
-f=test/test.sh
-b=test/$(basename $f .sh)
-echo b=$b
+echo=$(echo 1 2 3)
+echo echo=$echo
diff --git a/test/30-substitution-assignment.stdout b/test/30-substitution-assignment.stdout
index 94facae..7e6732e 100644
--- a/test/30-substitution-assignment.stdout
+++ b/test/30-substitution-assignment.stdout
@@ -1 +1 @@
-b=test/test
+echo=1 2 3
diff --git a/test/30-substitution-redirect.sh b/test/30-substitution-redirect.sh
new file mode 100644
index 0000000..9bdbc0f
--- /dev/null
+++ b/test/30-substitution-redirect.sh
@@ -0,0 +1 @@
+echo $(echo foo bar baz 2>/dev/null)
diff --git a/test/30-substitution-redirect.stdout b/test/30-substitution-redirect.stdout
new file mode 100644
index 0000000..1aeaedb
--- /dev/null
+++ b/test/30-substitution-redirect.stdout
@@ -0,0 +1 @@
+foo bar baz