Add format test

Author: dy

index.js

@@ -63,5 +63,6 @@ function parse(str, format){
     units = parse[units] || parse[units.toLowerCase().replace(/s$/, '')]
     if (units) result = (result || 0) + parseFloat(n, 10) * units
   })
-  return result / parse[format]
+
+  return result && (result / parse[format])
 }

test.js

@@ -114,3 +114,9 @@ t('invalid', t => {
 
 	t.end()
 })
+
+t('format', t => {
+	t.equal(parse('1hr 20mins', 'm'), parse('1hr 20mins') / 1000 / 60)
+
+	t.end()
+})