add album api & unit test, improve document

test/album.test.js

@@ -0,0 +1,17 @@
+const assert = require('assert')
+const crypto = require('crypto')
+const { createRequest } = require("../util/util")
+
+describe('测试获取歌手专辑列表是否正常', () => {
+  it('数据应该有 lrc 字段', done => {
+    const id = 32311
+    createRequest(`/api/album/${id}`, 'GET', null)
+      .then(result => {
+        const code = JSON.parse(result).code
+        console.log("code:" + code)
+        assert(code === 200)
+        done()
+      })
+      .catch(err => done(err))
+  })
+})