Auto generate tests with snapshots

package.json

@@ -68,6 +68,7 @@
   "devDependencies": {
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.6.1",
+    "directory-tree": "^2.0.0",
     "eslint": "^4.15.0",
     "eslint-config-developit": "^1.1.1",
     "fs-extra": "^5.0.0",

test/__snapshots__/index.test.js.snap

@@ -0,0 +1,41 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`fixtures demo 1`] = `
+"demo
+  dist
+    demo.js
+    demo.js.map
+    demo.m.js
+    demo.m.js.map
+    demo.umd.js
+    demo.umd.js.map
+  src
+    index.js
+    two.js
+
+
+Build output to dist:
+225 B: demo.js
+225 B: demo.m.js
+295 B: demo.umd.js"
+`;
+
+exports[`fixtures ts-demo 1`] = `
+"ts-demo
+  dist
+    ts-demo.js
+    ts-demo.js.map
+    ts-demo.m.js
+    ts-demo.m.js.map
+    ts-demo.umd.js
+    ts-demo.umd.js.map
+  src
+    car.ts
+    index.ts
+
+
+Build output to dist:
+106 B: ts-demo.js
+106 B: ts-demo.m.js
+175 B: ts-demo.umd.js"
+`;

test/index.test.js

@@ -0,0 +1,39 @@
+import path from 'path';
+import fs from 'fs-extra';
+import dirTree from 'directory-tree';
+import { strip } from './lib/util';
+import microbundle from '../src/index';
+
+const FIXTURES_DIR = `${__dirname}/fixtures`;
+
+const times = (n, fn) => Array.from({ length: n }).map(i => fn(i));
+const join = (arr, delimiter = '') => arr.join(delimiter);
+const constant = konst => () => konst;
+
+const printTree = (nodes, indentLevel = 0) => {
+	const indent = join(times(indentLevel, constant('  ')));
+	return join(nodes.map(node =>
+		`${indent}${node.name}\n${node.type === 'directory' ? printTree(node.children, indentLevel + 1) : ''}`
+	));
+};
+
+describe('fixtures', () => {
+	fs.readdirSync(FIXTURES_DIR).forEach(fixtureDir => {
+		const fixturePath = path.resolve(path.join(FIXTURES_DIR, fixtureDir));
+
+		if (!fs.statSync(fixturePath).isDirectory()) {
+			return;
+		}
+
+		it(fixtureDir, async () => {
+			const output = await microbundle({
+				cwd: path.resolve(fixturePath),
+				formats: 'es,cjs,umd'
+			});
+
+			const printedDir = printTree([dirTree(fixturePath)]);
+
+			expect(`${printedDir}\n\n${strip(output)}`).toMatchSnapshot();
+		});
+	});
+});