diff --git a/assert.sh b/assert.sh
index ffd2b95..8cc6873 100644
--- a/assert.sh
+++ b/assert.sh
@@ -103,7 +103,7 @@ assert() {
     (( tests_ran++ )) || :
     [[ -z "$DISCOVERONLY" ]] || return
     expected=$(echo -ne "${2:-}")
-    result="$(eval 2>/dev/null $1 <<< ${3:-})" || true
+    result="$(eval 2>/dev/null "$1" <<< ${3:-})" || true
     if [[ "$result" == "$expected" ]]; then
         [[ -z "$DEBUG" ]] || echo -n .
         return
@@ -119,7 +119,7 @@ assert_raises() {
     (( tests_ran++ )) || :
     [[ -z "$DISCOVERONLY" ]] || return
     status=0
-    (eval $1 <<< ${3:-}) > /dev/null 2>&1 || status=$?
+    (eval "$1" <<< ${3:-}) > /dev/null 2>&1 || status=$?
     expected=${2:-0}
     if [[ "$status" -eq "$expected" ]]; then
         [[ -z "$DEBUG" ]] || echo -n .
diff --git a/tests.sh b/tests.sh
index e8c1425..ea1411a 100755
--- a/tests.sh
+++ b/tests.sh
@@ -14,6 +14,16 @@ assert "seq 2" "1\n2"                   # multi-line output expected
 assert_raises 'read a; exit $a' 42 "42" # variables still work
 assert "echo 1;
 echo 2      # ^" "1\n2"                 # semicolon required!
+
+# support for multiline command
+MULTILINE=$(cat <<EOF
+# comment
+echo -n "hello "
+echo -n "world"
+EOF
+)
+assert "$MULTILINE" "hello world"                 # output expected
+
 assert_end demo
 
 _clean() {