diff --git a/test/fixtures/transformation/optional-external-runtime/amd/actual.js b/test/fixtures/transformation/optional-external-runtime/amd/actual.js
new file mode 100644
index 0000000000..09493dc9be
--- /dev/null
+++ b/test/fixtures/transformation/optional-external-runtime/amd/actual.js
@@ -0,0 +1 @@
+import foo from "someModule";
diff --git a/test/fixtures/transformation/optional-external-runtime/amd/expected.js b/test/fixtures/transformation/optional-external-runtime/amd/expected.js
new file mode 100644
index 0000000000..20e759af12
--- /dev/null
+++ b/test/fixtures/transformation/optional-external-runtime/amd/expected.js
@@ -0,0 +1,6 @@
+define(["exports", "6to5-runtime", "someModule"], function (exports, _to5Runtime2, _someModule) {
+  "use strict";
+
+  var _to5Runtime = _to5Runtime2;
+  var foo = _to5Runtime.interopRequire(_someModule);
+});
diff --git a/test/fixtures/transformation/optional-external-runtime/amd/options.json b/test/fixtures/transformation/optional-external-runtime/amd/options.json
new file mode 100644
index 0000000000..b76b119f33
--- /dev/null
+++ b/test/fixtures/transformation/optional-external-runtime/amd/options.json
@@ -0,0 +1,3 @@
+{
+  "modules": "amd"
+}
diff --git a/test/fixtures/transformation/optional-external-runtime/basic/actual.js b/test/fixtures/transformation/optional-external-runtime/commonjs/actual.js
similarity index 100%
rename from test/fixtures/transformation/optional-external-runtime/basic/actual.js
rename to test/fixtures/transformation/optional-external-runtime/commonjs/actual.js
diff --git a/test/fixtures/transformation/optional-external-runtime/basic/expected.js b/test/fixtures/transformation/optional-external-runtime/commonjs/expected.js
similarity index 100%
rename from test/fixtures/transformation/optional-external-runtime/basic/expected.js
rename to test/fixtures/transformation/optional-external-runtime/commonjs/expected.js