Add nyc and coveralls

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 level-test-*
+.nyc_output/

.travis.yml

@@ -6,3 +6,5 @@ node_js:
   - 6
   - 8
   - 10
+
+after_success: npm run coverage

README.md

@@ -7,6 +7,7 @@
 ![Node version](https://img.shields.io/node/v/level-packager.svg)
 [![Build Status](https://secure.travis-ci.org/Level/packager.png)](http://travis-ci.org/Level/packager)
 [![dependencies](https://david-dm.org/Level/packager.svg)](https://david-dm.org/level/packager)
+[![Coverage Status](https://coveralls.io/repos/github/Level/packager/badge.svg)](https://coveralls.io/github/Level/packager)
 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 [![npm](https://img.shields.io/npm/dm/level-packager.svg)](https://www.npmjs.com/package/level-packager)
 

package.json

@@ -7,7 +7,8 @@
     "url": "https://github.com/Level/packager.git"
   },
   "scripts": {
-    "test": "standard && node test.js",
+    "test": "standard && nyc node test.js",
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
     "remark": "remark README.md CHANGELOG.md CONTRIBUTORS.md UPGRADING.md -o"
   },
   "remarkConfig": {
@@ -38,7 +39,9 @@
   },
   "license": "MIT",
   "devDependencies": {
+    "coveralls": "^3.0.2",
     "level-community": "^3.0.0",
+    "nyc": "^12.0.2",
     "remark-cli": "^5.0.0",
     "remark-git-contributors": "^0.2.2",
     "remark-github": "^7.0.3",

test.js

@@ -29,7 +29,7 @@ test('Level constructor relays .repair if it exists', function (t) {
   packager(Down).repair('location')
 })
 
-test('Level constructor, default options', function (t) {
+test('Level constructor with default options', function (t) {
   t.plan(3)
   function Down (location) {
     t.is(location, 'location', 'location is correct')
@@ -42,7 +42,24 @@ test('Level constructor, default options', function (t) {
   t.is(levelup.options.valueEncoding, 'utf8')
 })
 
-test('Level constructor, custom options', function (t) {
+test('Level constructor with callback', function (t) {
+  t.plan(4)
+  function Down (location) {
+    t.is(location, 'location', 'location is correct')
+    return {
+      open: function (opts, cb) {
+        t.pass('open called')
+        process.nextTick(cb)
+      }
+    }
+  }
+  packager(Down)('location', function (err, db) {
+    t.error(err)
+    t.ok(db, 'db set in callback')
+  })
+})
+
+test('Level constructor with custom options', function (t) {
   t.plan(3)
   var Down = function (location) {
     t.is(location, 'location', 'location is correct')