feat(lib): implement sorting of config diff object (#56)

src/lib/sort-rules.js

@@ -1,9 +1,29 @@
 'use strict'
 
 function getSortedRules(rules) {
-  return rules.sort(function sort(a, b) {
-    return a > b ? 1 : -1
-  })
+  return Array.isArray(rules) ? getSortedRulesArray(rules) : transformIntoSortedRulesArray(rules)
+}
+
+function getSortedRulesArray(rules) {
+  return rules.sort(sortAlphabetically)
+}
+
+function transformIntoSortedRulesArray(rules) {
+  var sortedRules = []
+
+  Object.keys(rules)
+    .sort(sortAlphabetically)
+    .forEach(function mapRules(ruleName) {
+      var rule = {}
+      rule[ruleName] = rules[ruleName]
+      sortedRules.push(rule)
+    })
+
+  return sortedRules
+}
+
+function sortAlphabetically(a, b) {
+  return a > b ? 1 : -1
 }
 
 module.exports = getSortedRules

test/lib/sort-rules.js

@@ -16,4 +16,15 @@ describe('sort-rules', function() {
       ['a', 'aa', 'ab', 'b', 'c']
     )
   })
+
+  it('should return sorted rule configs', function() {
+    assert.deepEqual(
+      sortRules({'bar-rule': {config1: '1', config2: '2'}, 'baz-rule': {config1: '3', config2: '4'}}),
+      [{'bar-rule': {config1: '1', config2: '2'}}, {'baz-rule': {config1: '3', config2: '4'}}]
+    )
+    assert.deepEqual(
+      sortRules({'foo-rule': {config1: '1', config2: '2'}, 'bar-rule': {config1: '3', config2: '4'}}),
+      [{'bar-rule': {config1: '3', config2: '4'}}, {'foo-rule': {config1: '1', config2: '2'}}]
+    )
+  })
 })