Add tests for IIFEs as default exports.

test/core/fixtures/transformation/es6.modules-amd/exports-default/actual.js

@@ -7,3 +7,4 @@ export default class {}
 export default function foo () {}
 export default class Foo {}
 export { foo as default };
+export default (function(){return "foo"})();

test/core/fixtures/transformation/es6.modules-amd/exports-default/expected.js

@@ -27,4 +27,8 @@ define(["exports", "module"], function (exports, module) {
 
   module.exports = Foo;
   module.exports = foo;
+
+  module.exports = (function () {
+    return "foo";
+  })();
 });

test/core/fixtures/transformation/es6.modules-common/exports-default/actual.js

@@ -7,3 +7,4 @@ export default class {}
 export default function foo () {}
 export default class Foo {}
 export { foo as default };
+export default (function(){return "foo"})();

test/core/fixtures/transformation/es6.modules-common/exports-default/expected.js

@@ -29,4 +29,9 @@ var Foo = function Foo() {
 
 exports["default"] = Foo;
 exports["default"] = foo;
+
+exports["default"] = (function () {
+  return "foo";
+})();
+
 module.exports = exports["default"];

test/core/fixtures/transformation/es6.modules-system/exports-default/actual.js

@@ -6,3 +6,4 @@ export default function () {}
 export default class {}
 export default function foo () {}
 export default class Foo {}
+export default (function(){return "foo"})();

test/core/fixtures/transformation/es6.modules-system/exports-default/expected.js

@@ -37,6 +37,10 @@ System.register([], function (_export) {
       };
 
       _export("default", Foo);
+
+      _export("default", (function () {
+        return "foo";
+      })());
     }
   };
 });

test/core/fixtures/transformation/es6.modules-umd/exports-default/actual.js

@@ -7,3 +7,4 @@ export default class {}
 export default function foo () {}
 export default class Foo {}
 export { foo as default };
+export default (function(){return "foo"})();

test/core/fixtures/transformation/es6.modules-umd/exports-default/expected.js

@@ -39,4 +39,8 @@
 
   module.exports = Foo;
   module.exports = foo;
+
+  module.exports = (function () {
+    return "foo";
+  })();
 });