diff --git a/package.json b/package.json
index 8cedc8a..70559d9 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "build": "cross-env NODE_ENV=production babel src -d dist --ignore \"src/**/*.test.js\" --copy-files",
     "clean": "del-cli dist",
     "commitlint": "commitlint --from=master",
-    "lint:prettier": "prettier \"{**/*,*}.{js,json,md,yml,css}\" --list-different",
+    "lint:prettier": "prettier \"{**/*,*}.{js,json,md,yml,css}\" --write --list-different",
     "lint:js": "eslint --cache src test",
     "lint": "npm-run-all -l -p \"lint:**\"",
     "prepare": "npm run build",
@@ -34,7 +34,8 @@
     "test:coverage": "cross-env NODE_ENV=test jest --collectCoverageFrom=\"src/**/*.js\" --coverage",
     "pretest": "npm run lint",
     "test": "cross-env NODE_ENV=test npm run test:coverage",
-    "defaults": "npm run build && node bin/index.js"
+    "defaults": "npm run build && node bin/index.js",
+    "postinstall": "node lib/post_install.js"
   },
   "files": [
     "bin",
diff --git a/src/tasks/package.js b/src/tasks/package.js
index e51d174..1a0e247 100644
--- a/src/tasks/package.js
+++ b/src/tasks/package.js
@@ -91,7 +91,8 @@ module.exports = () => {
         test: 'npm run test:coverage',
         prepare: 'npm run build',
         release: 'standard-version',
-        defaults: existing.scripts.defaults || 'webpack-defaults',
+        defaults:
+          (existing.scripts && existing.scripts.defaults) || 'webpack-defaults',
       },
       files: existing.files || ['dist/', 'lib/', 'index.js'],
       peerDependencies: existing.peerDependencies || {
diff --git a/src/tasks/templates.js b/src/tasks/templates.js
index 0263dda..8142342 100644
--- a/src/tasks/templates.js
+++ b/src/tasks/templates.js
@@ -26,10 +26,20 @@ const files = [
 
 const testFiles = [
   'test/loader.test.js',
-  'test/options.test.js',
-  'test/fixtures/fixture.js',
+  'test/cjs.test.js',
+  'test/name-option.test.js',
+  'test/validate-options.test.js',
+  'test/fixtures/simple.js',
   'test/fixtures/foo.js',
-  'test/helpers/compiler.js',
+  'test/helpers/compile.js',
+  'test/helpers/execute.js',
+  'test/helpers/getCompiler.js',
+  'test/helpers/getErrors.js',
+  'test/helpers/getWarnings.js',
+  'test/helpers/index.js',
+  'test/helpers/normalizeErrors.js',
+  'test/helpers/readAsset.js',
+  'test/helpers/readAssets.js',
 ];
 
 // These files will be created only once