diff --git a/test/fixtures/bin/6to5-node/--extensions/in-files/foo.bar b/test/fixtures/bin/6to5-node/--extensions/in-files/foo.bar
new file mode 100644
index 0000000000..9d023628ac
--- /dev/null
+++ b/test/fixtures/bin/6to5-node/--extensions/in-files/foo.bar
@@ -0,0 +1 @@
+console.log([1, 2, 3].map(x => x * x));
diff --git a/test/fixtures/bin/6to5-node/--extensions/options.json b/test/fixtures/bin/6to5-node/--extensions/options.json
new file mode 100644
index 0000000000..c64999d8e2
--- /dev/null
+++ b/test/fixtures/bin/6to5-node/--extensions/options.json
@@ -0,0 +1,4 @@
+{
+  "args": ["foo", "--extensions", ".bar"],
+  "stdout": "[ 1, 4, 9 ]"
+}