Fix qunit and eslint issues

PR-URL: #2

.travis.yml

@@ -0,0 +1,8 @@
+language: node_js
+node_js:
+  - "6"
+  - "7"
+  - "8"
+  - "9"
+script:
+  - npm test

bin/mkdoc.js

@@ -1,17 +1,21 @@
-var dox = require('dox'),
-    fs = require('fs'),
-    code = fs.readFileSync(__dirname + '/../index.js').toString('utf8'),
-    ast = dox.parseComments(code, {raw: true}),
-    apiDoc = dox.api(ast),
-    tpl, readme;
+'use strict';
+
+const dox = require('dox');
+const fs = require('fs');
+
+const code = fs.readFileSync(__dirname + '/../index.js').toString('utf8');
+const ast = dox.parseComments(code, { raw: true });
+
+let apiDoc = dox.api(ast);
 
 // Don't like the new format Do.method
 apiDoc = apiDoc
     .replace(/Do\./g, 'Do#')
     .replace('##', '###')
     .trim();
-tpl = fs.readFileSync(__dirname + '/readme.tpl', 'utf8');
-readme = tpl.replace('{api}', apiDoc);
+
+const tpl = fs.readFileSync(__dirname + '/readme.tpl', 'utf8');
+const readme = tpl.replace('{api}', apiDoc);
 fs.writeFileSync(__dirname + '/../readme.md', readme);
 
 console.log('Written readme.md');

do.js

@@ -49,7 +49,7 @@ Do.prototype.errors;
  * @api public
  */
 Do.prototype.amount = function(value) {
-  if (value !== null) {
+  if (typeof(value) === 'number') {
     this._amount = value;
     return this;
   }