Add a failing test that illustrates a problem with RSVP.

test/function/top-level-side-effects-are-preserved/_config.js

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+module.exports = {
+  description: 'top level side effects are preserved'
+};

test/function/top-level-side-effects-are-preserved/asap.js

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+export default function asap() {}

test/function/top-level-side-effects-are-preserved/config.js

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+export const config = {};

test/function/top-level-side-effects-are-preserved/defer.js

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+import { config } from './config';
+
+export default function defer() {
+  config.async();
+}

test/function/top-level-side-effects-are-preserved/main.js

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+import { defer } from './rsvp';
+
+defer();

test/function/top-level-side-effects-are-preserved/rsvp.js

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+import { config } from './config';
+import asap from './asap';
+import defer from './defer';
+
+config.async = asap;
+
+export { defer };