Added test for asset subfolder.

test/asset-folder/__snapshots__/index.test.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Asset Folder 1`] = `
+"bundled-assets
+index.js"
+`;
+
+exports[`Asset Folder 2`] = `
+"bXipeBrs.png
+bsdudxaF.md
+gToHHcDx.css
+gToHHcDx.css.map"
+`;
+
+exports[`Asset Folder 3`] = `
+"import content from './bundled-assets/bsdudxaF.md';
+import css from './bundled-assets/gToHHcDx.css';
+
+function index() {
+  return content + css
+}
+
+export default index;
+"
+`;
+
+exports[`Asset Folder 4`] = `
+"body {
+  font-size: 20px;
+  background: url(./bXipeBrs.png) top left repeat;
+}
+
+/*# sourceMappingURL=gToHHcDx.css.map */"
+`;

test/asset-folder/content.md

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+# Hello

test/asset-folder/index.css

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+body {
+  font-size: 20px;
+  background: url(./image.png) top left repeat;
+}

test/asset-folder/index.js

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+import content from "./content.md"
+import css from "./index.css"
+
+export default function() {
+  return content + css
+}

test/asset-folder/index.test.js

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+import { bundle, clean, list, read } from "../util"
+
+const root = __dirname
+
+test("Asset Folder", async () => {
+  await bundle(root, "index.js", "output/index.js", { folder: "bundled-assets" })
+
+  expect(await list(root, "output")).toMatchSnapshot()
+  expect(await list(root, "output/bundled-assets")).toMatchSnapshot()
+  expect(await read(root, "output/index.js")).toMatchSnapshot()
+  expect(await read(root, "output/bundled-assets/gToHHcDx.css")).toMatchSnapshot()
+
+  await clean(root, "output")
+})