Add a proper test harness (via Jest)

package.json

@@ -12,15 +12,18 @@
     "prepare": "npm run -s build",
     "prepare:babel": "babel --presets env src/*.js -d dist && npm t",
     "lint": "eslint src",
-    "test:build": "node dist/cli.js --no-compress --cwd test/demo",
-    "test:build:ts": "node dist/cli.js --no-compress --cwd test/ts-demo --entry=src/index.ts",
-    "test": "npm run -s lint && npm run -s build && npm run -s test:build && npm run -s test:build:ts",
+    "test": "npm run -s lint && npm run -s build && jest",
     "release": "npm run -s prepare && npm test && git commit -am $npm_package_version && git tag $npm_package_version && git push && git push --tags && npm publish"
   },
   "repository": "developit/microbundle",
   "eslintConfig": {
     "extends": "eslint-config-developit"
   },
+  "babel": {
+    "presets": [
+      "env"
+    ]
+  },
   "keywords": [
     "bundle",
     "rollup",
@@ -66,6 +69,9 @@
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.6.1",
     "eslint": "^4.15.0",
-    "eslint-config-developit": "^1.1.1"
+    "eslint-config-developit": "^1.1.1",
+    "fs-extra": "^5.0.0",
+    "jest": "^22.1.4",
+    "strip-ansi": "^4.0.0"
   }
 }

test/demo.test.js

@@ -0,0 +1,31 @@
+import path from 'path';
+import fs from 'fs-extra';
+import { strip } from './lib/util';
+import microbundle from '../src/index';
+
+describe('demo', () => {
+	it('should produce build files', async () => {
+		let output = await microbundle({
+			cwd: path.resolve(__dirname, 'fixtures/demo'),
+			formats: 'es,cjs,umd'
+		});
+
+		expect(strip(output)).toEqual(strip(`
+			Build output to dist:
+			225 B: demo.js
+			225 B: demo.m.js
+			295 B: demo.umd.js
+		`));
+
+		let dist = await fs.readdir(path.resolve(__dirname, 'fixtures/demo/dist'));
+
+		expect(dist).toEqual([
+			'demo.js',
+			'demo.js.map',
+			'demo.m.js',
+			'demo.m.js.map',
+			'demo.umd.js',
+			'demo.umd.js.map'
+		]);
+	});
+});

test/lib/util.js

@@ -0,0 +1,3 @@
+import stripAnsi from 'strip-ansi';
+
+export const strip = s => stripAnsi(s).replace(/(?:^[\n\s]+|[\n\s]+$|(^|\n)\s+)/gm, '$1');

test/ts-demo.test.js

@@ -0,0 +1,31 @@
+import path from 'path';
+import fs from 'fs-extra';
+import { strip } from './lib/util';
+import microbundle from '../src/index';
+
+describe('ts-demo', () => {
+	it('should produce build files', async () => {
+		let output = await microbundle({
+			cwd: path.resolve(__dirname, 'fixtures/ts-demo'),
+			formats: 'es,cjs,umd'
+		});
+
+		expect(strip(output)).toEqual(strip(`
+			Build output to dist:
+			106 B: ts-demo.js
+			106 B: ts-demo.m.js
+			175 B: ts-demo.umd.js
+		`));
+
+		let dist = await fs.readdir(path.resolve(__dirname, 'fixtures/ts-demo/dist'));
+
+		expect(dist).toEqual([
+			'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'
+		]);
+	});
+});

test/ts-demo/package.json

@@ -1,3 +0,0 @@
-{
-  "name": "ts-demo"
-}