extract renameStorage, removeStorage methods

and tests for each of them

browser/main/lib/dataApi/renameStorage.js

@@ -0,0 +1,33 @@
+const _ = require('lodash')
+
+/**
+ * @param {String} key
+ * @param {String} name
+ * @return {Object} Storage meta data
+ */
+function renameStorage (key, name) {
+  if (!_.isString(name)) return Promise.reject(new Error('Name must be a string.'))
+
+  let rawStorages
+  try {
+    rawStorages = JSON.parse(localStorage.getItem('storages'))
+    if (!_.isArray(rawStorages)) throw new Error('invalid storages')
+  } catch (e) {
+    console.warn(e)
+    rawStorages = []
+  }
+
+  let targetStorage
+  for (let i = 0; i < rawStorages.length; i++) {
+    if (rawStorages[i].key === key) {
+      rawStorages[i].name = name
+      targetStorage = rawStorages[i]
+    }
+  }
+
+  localStorage.setItem('storages', JSON.stringify(rawStorages))
+
+  return Promise.resolve(targetStorage)
+}
+
+module.exports = renameStorage