diff --git a/lib/plugins/processor/common.js b/lib/plugins/processor/common.js
index 7f2a154b06..e2f5410a29 100644
--- a/lib/plugins/processor/common.js
+++ b/lib/plugins/processor/common.js
@@ -12,7 +12,7 @@ function isTmpFile(path) {
 }
 
 function isHiddenFile(path) {
-  return /(^|\/)[_\.]/.test(path); // eslint-disable-line no-useless-escape
+  return /(^|\/)[_.]/.test(path);
 }
 
 exports.ignoreTmpAndHiddenFile = new Pattern(path => {
diff --git a/lib/plugins/tag/img.js b/lib/plugins/tag/img.js
index b26c275374..8172b051db 100644
--- a/lib/plugins/tag/img.js
+++ b/lib/plugins/tag/img.js
@@ -4,7 +4,7 @@ const url = require('url');
 const util = require('hexo-util');
 const htmlTag = util.htmlTag;
 
-const rUrl = /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[.\!\/\\w]*))?)/; // eslint-disable-line no-useless-escape
+const rUrl = /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=+$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=+$,\w]+@)[A-Za-z0-9.-]+)((?:\/[+~%/.\w-_]*)?\??(?:[-+=&;%@.\w_]*)#?(?:[.!/\\w]*))?)/;
 const rMeta = /["']?([^"']+)?["']?\s*["']?([^"']+)?["']?/;
 
 /**
diff --git a/lib/plugins/tag/link.js b/lib/plugins/tag/link.js
index 43a3973884..dda947519b 100644
--- a/lib/plugins/tag/link.js
+++ b/lib/plugins/tag/link.js
@@ -3,7 +3,7 @@
 const util = require('hexo-util');
 const htmlTag = util.htmlTag;
 
-const rUrl = /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[.\!\/\\w]*))?)/; // eslint-disable-line no-useless-escape
+const rUrl = /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=+$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=+$,\w]+@)[A-Za-z0-9.-]+)((?:\/[+~%/.\w-_]*)?\??(?:[-+=&;%@.\w_]*)#?(?:[.!/\\w]*))?)/;
 
 /**
 * Link tag
diff --git a/test/.eslintrc b/test/.eslintrc
index 63794c0fc3..ff5a71bee7 100644
--- a/test/.eslintrc
+++ b/test/.eslintrc
@@ -2,5 +2,8 @@
   "extends": "hexo/test",
   "env": {
     "es6": true
+  },
+  "globals": {
+    "should": true
   }
 }
\ No newline at end of file
diff --git a/test/index.js b/test/index.js
index 69b8a0713f..68b8655b91 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,8 +1,6 @@
 'use strict';
 
-const chai = require('chai');
-
-chai.use(require('chai-as-promised'));
+require('chai').use(require('chai-as-promised'));
 
 describe('Hexo', () => {
   require('./scripts/box');
diff --git a/test/mocha.opts b/test/mocha.opts
index fb5f82427f..78f25f9c04 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1 +1,6 @@
---reporter spec
\ No newline at end of file
+--colors
+--reporter spec
+--ui bdd
+--full-trace
+--exit
+--require chai/register-should
\ No newline at end of file
diff --git a/test/scripts/box/box.js b/test/scripts/box/box.js
index 6a00ce8a3a..2cf686c52b 100644
--- a/test/scripts/box/box.js
+++ b/test/scripts/box/box.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/box/file.js b/test/scripts/box/file.js
index ffa199b5be..70e15abe0b 100644
--- a/test/scripts/box/file.js
+++ b/test/scripts/box/file.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const Promise = require('bluebird');
 const fs = require('hexo-fs');
diff --git a/test/scripts/console/clean.js b/test/scripts/console/clean.js
index c86e76e6d0..711ddbcd5a 100644
--- a/test/scripts/console/clean.js
+++ b/test/scripts/console/clean.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 
 describe('clean', () => {
diff --git a/test/scripts/console/config.js b/test/scripts/console/config.js
index a0cede8ac2..928c164cb5 100644
--- a/test/scripts/console/config.js
+++ b/test/scripts/console/config.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const pathFn = require('path');
 const yaml = require('js-yaml');
diff --git a/test/scripts/console/deploy.js b/test/scripts/console/deploy.js
index 1a9485550d..8b0d9bd4a7 100644
--- a/test/scripts/console/deploy.js
+++ b/test/scripts/console/deploy.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const pathFn = require('path');
 const sinon = require('sinon');
diff --git a/test/scripts/console/generate.js b/test/scripts/console/generate.js
index cb5377b4ca..429ee24c1d 100644
--- a/test/scripts/console/generate.js
+++ b/test/scripts/console/generate.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/console/migrate.js b/test/scripts/console/migrate.js
index 73ceb01547..a029b50fd8 100644
--- a/test/scripts/console/migrate.js
+++ b/test/scripts/console/migrate.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 
 describe('migrate', () => {
diff --git a/test/scripts/console/new.js b/test/scripts/console/new.js
index 3d430b887b..2ed1a11326 100644
--- a/test/scripts/console/new.js
+++ b/test/scripts/console/new.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const moment = require('moment');
 const pathFn = require('path');
diff --git a/test/scripts/console/publish.js b/test/scripts/console/publish.js
index f470a10a14..8252dbe74f 100644
--- a/test/scripts/console/publish.js
+++ b/test/scripts/console/publish.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const moment = require('moment');
 const pathFn = require('path');
diff --git a/test/scripts/console/render.js b/test/scripts/console/render.js
index 7b90ad1816..5243703740 100644
--- a/test/scripts/console/render.js
+++ b/test/scripts/console/render.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const pathFn = require('path');
 const Promise = require('bluebird');
diff --git a/test/scripts/extend/console.js b/test/scripts/extend/console.js
index f8f7a313f2..5eaa2fcd59 100644
--- a/test/scripts/extend/console.js
+++ b/test/scripts/extend/console.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Console', () => {
   const Console = require('../../../lib/extend/console');
diff --git a/test/scripts/extend/deployer.js b/test/scripts/extend/deployer.js
index 54b287018a..e07d37c4e1 100644
--- a/test/scripts/extend/deployer.js
+++ b/test/scripts/extend/deployer.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Deployer', () => {
   const Deployer = require('../../../lib/extend/deployer');
diff --git a/test/scripts/extend/filter.js b/test/scripts/extend/filter.js
index 0741760c4c..1c9d88bf32 100644
--- a/test/scripts/extend/filter.js
+++ b/test/scripts/extend/filter.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 
 describe('Filter', () => {
diff --git a/test/scripts/extend/generator.js b/test/scripts/extend/generator.js
index 87f9432975..ee713bf075 100644
--- a/test/scripts/extend/generator.js
+++ b/test/scripts/extend/generator.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Generator', () => {
   const Generator = require('../../../lib/extend/generator');
diff --git a/test/scripts/extend/helper.js b/test/scripts/extend/helper.js
index bbafafd673..bf96500c89 100644
--- a/test/scripts/extend/helper.js
+++ b/test/scripts/extend/helper.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Helper', () => {
   const Helper = require('../../../lib/extend/helper');
diff --git a/test/scripts/extend/migrator.js b/test/scripts/extend/migrator.js
index 7a63c095ac..a00a341945 100644
--- a/test/scripts/extend/migrator.js
+++ b/test/scripts/extend/migrator.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Migrator', () => {
   const Migrator = require('../../../lib/extend/migrator');
diff --git a/test/scripts/extend/processor.js b/test/scripts/extend/processor.js
index b81d3a2530..058033eea4 100644
--- a/test/scripts/extend/processor.js
+++ b/test/scripts/extend/processor.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Processor', () => {
   const Processor = require('../../../lib/extend/processor');
diff --git a/test/scripts/extend/renderer.js b/test/scripts/extend/renderer.js
index 17e5b8bdec..5d3de80393 100644
--- a/test/scripts/extend/renderer.js
+++ b/test/scripts/extend/renderer.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Renderer', () => {
   const Renderer = require('../../../lib/extend/renderer');
diff --git a/test/scripts/extend/tag.js b/test/scripts/extend/tag.js
index 902bac7900..2481ea96b8 100644
--- a/test/scripts/extend/tag.js
+++ b/test/scripts/extend/tag.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const Promise = require('bluebird');
 
diff --git a/test/scripts/filters/backtick_code_block.js b/test/scripts/filters/backtick_code_block.js
index 16a221116c..0af64cf9f6 100644
--- a/test/scripts/filters/backtick_code_block.js
+++ b/test/scripts/filters/backtick_code_block.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const util = require('hexo-util');
 const cloneDeep = require('lodash/cloneDeep');
 const defaultConfig = require('../../../lib/hexo/default_config');
diff --git a/test/scripts/filters/excerpt.js b/test/scripts/filters/excerpt.js
index 9af0d84076..c91fe566cf 100644
--- a/test/scripts/filters/excerpt.js
+++ b/test/scripts/filters/excerpt.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Excerpt', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/filters/external_link.js b/test/scripts/filters/external_link.js
index 9705852f20..96a345e40e 100644
--- a/test/scripts/filters/external_link.js
+++ b/test/scripts/filters/external_link.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('External link', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/filters/i18n_locals.js b/test/scripts/filters/i18n_locals.js
index 5a2b10fdc2..75fe3ed9f0 100644
--- a/test/scripts/filters/i18n_locals.js
+++ b/test/scripts/filters/i18n_locals.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('i18n locals', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/filters/new_post_path.js b/test/scripts/filters/new_post_path.js
index 19d11bcc4e..cfe99e265f 100644
--- a/test/scripts/filters/new_post_path.js
+++ b/test/scripts/filters/new_post_path.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 const moment = require('moment');
diff --git a/test/scripts/filters/post_permalink.js b/test/scripts/filters/post_permalink.js
index e497af1c9e..4b5ba16f7f 100644
--- a/test/scripts/filters/post_permalink.js
+++ b/test/scripts/filters/post_permalink.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const moment = require('moment');
 
 const PERMALINK = ':year/:month/:day/:title/';
diff --git a/test/scripts/filters/render_post.js b/test/scripts/filters/render_post.js
index 9ec1db3e32..815bfa87a3 100644
--- a/test/scripts/filters/render_post.js
+++ b/test/scripts/filters/render_post.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fixture = require('../../fixtures/post_render');
 
 describe('Render post', () => {
diff --git a/test/scripts/filters/save_database.js b/test/scripts/filters/save_database.js
index d854805e45..641cdfb8b5 100644
--- a/test/scripts/filters/save_database.js
+++ b/test/scripts/filters/save_database.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
 
diff --git a/test/scripts/filters/titlecase.js b/test/scripts/filters/titlecase.js
index e7d5240d7b..38e3ae43f0 100644
--- a/test/scripts/filters/titlecase.js
+++ b/test/scripts/filters/titlecase.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('Titlecase', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/generators/asset.js b/test/scripts/generators/asset.js
index 69b2d72705..fa1f75cc8c 100644
--- a/test/scripts/generators/asset.js
+++ b/test/scripts/generators/asset.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 const pathFn = require('path');
 const fs = require('hexo-fs');
diff --git a/test/scripts/generators/page.js b/test/scripts/generators/page.js
index b04f3a7c1c..27105df15c 100644
--- a/test/scripts/generators/page.js
+++ b/test/scripts/generators/page.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('page', () => {
diff --git a/test/scripts/generators/post.js b/test/scripts/generators/post.js
index 38e546b7ef..6a0bf67fbc 100644
--- a/test/scripts/generators/post.js
+++ b/test/scripts/generators/post.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('post', () => {
diff --git a/test/scripts/helpers/css.js b/test/scripts/helpers/css.js
index a04530942b..35c6ed23b1 100644
--- a/test/scripts/helpers/css.js
+++ b/test/scripts/helpers/css.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('css', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/date.js b/test/scripts/helpers/date.js
index d77179f2c0..d45bed0298 100644
--- a/test/scripts/helpers/date.js
+++ b/test/scripts/helpers/date.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const moment = require('moment-timezone');
-const should = require('chai').should(); // eslint-disable-line
 const sinon = require('sinon');
 
 describe('date', () => {
diff --git a/test/scripts/helpers/debug.js b/test/scripts/helpers/debug.js
index 81458f33e3..c31829a547 100644
--- a/test/scripts/helpers/debug.js
+++ b/test/scripts/helpers/debug.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const rewire = require('rewire');
 const sinon = require('sinon');
 
diff --git a/test/scripts/helpers/favicon_tag.js b/test/scripts/helpers/favicon_tag.js
index f0ce58de0c..17b5f6dc67 100644
--- a/test/scripts/helpers/favicon_tag.js
+++ b/test/scripts/helpers/favicon_tag.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('favicon_tag', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/feed_tag.js b/test/scripts/helpers/feed_tag.js
index 0faf4f0888..5d2b7b2f7c 100644
--- a/test/scripts/helpers/feed_tag.js
+++ b/test/scripts/helpers/feed_tag.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('feed_tag', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/fragment_cache.js b/test/scripts/helpers/fragment_cache.js
index a32876ce5a..5a816cb0cf 100644
--- a/test/scripts/helpers/fragment_cache.js
+++ b/test/scripts/helpers/fragment_cache.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('fragment_cache', () => {
   const fragment_cache = require('../../../lib/plugins/helper/fragment_cache')();
diff --git a/test/scripts/helpers/gravatar.js b/test/scripts/helpers/gravatar.js
index 222df76f43..8b577e97af 100644
--- a/test/scripts/helpers/gravatar.js
+++ b/test/scripts/helpers/gravatar.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const crypto = require('crypto');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('gravatar', () => {
   const gravatar = require('../../../lib/plugins/helper/gravatar');
diff --git a/test/scripts/helpers/image_tag.js b/test/scripts/helpers/image_tag.js
index 8e52b4066c..9edef1bc65 100644
--- a/test/scripts/helpers/image_tag.js
+++ b/test/scripts/helpers/image_tag.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('image_tag', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/is.js b/test/scripts/helpers/is.js
index bd4b3a5be5..404fa4dfee 100644
--- a/test/scripts/helpers/is.js
+++ b/test/scripts/helpers/is.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('is', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/js.js b/test/scripts/helpers/js.js
index 4ce7d98290..4cfc8be795 100644
--- a/test/scripts/helpers/js.js
+++ b/test/scripts/helpers/js.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('js', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/link_to.js b/test/scripts/helpers/link_to.js
index 1e7ee44595..b89ac5c402 100644
--- a/test/scripts/helpers/link_to.js
+++ b/test/scripts/helpers/link_to.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('link_to', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/list_archives.js b/test/scripts/helpers/list_archives.js
index 8b5d3674f6..d9c8990b9e 100644
--- a/test/scripts/helpers/list_archives.js
+++ b/test/scripts/helpers/list_archives.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('list_archives', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/list_categories.js b/test/scripts/helpers/list_categories.js
index 4456bbb963..f145eac462 100644
--- a/test/scripts/helpers/list_categories.js
+++ b/test/scripts/helpers/list_categories.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('list_categories', () => {
diff --git a/test/scripts/helpers/list_posts.js b/test/scripts/helpers/list_posts.js
index 511821e226..032c1a7133 100644
--- a/test/scripts/helpers/list_posts.js
+++ b/test/scripts/helpers/list_posts.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('list_posts', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/list_tags.js b/test/scripts/helpers/list_tags.js
index 28a1a5e69c..dfb300088f 100644
--- a/test/scripts/helpers/list_tags.js
+++ b/test/scripts/helpers/list_tags.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('list_tags', () => {
diff --git a/test/scripts/helpers/mail_to.js b/test/scripts/helpers/mail_to.js
index 8beb40ab8f..73bb24c4ee 100644
--- a/test/scripts/helpers/mail_to.js
+++ b/test/scripts/helpers/mail_to.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const qs = require('querystring');
 
 describe('mail_to', () => {
diff --git a/test/scripts/helpers/markdown.js b/test/scripts/helpers/markdown.js
index 24af2faa7f..524c64b7fe 100644
--- a/test/scripts/helpers/markdown.js
+++ b/test/scripts/helpers/markdown.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('markdown', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/number_format.js b/test/scripts/helpers/number_format.js
index befd6ecb9f..1ae0f95f96 100644
--- a/test/scripts/helpers/number_format.js
+++ b/test/scripts/helpers/number_format.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('number_format', () => {
   const numberFormat = require('../../../lib/plugins/helper/number_format');
diff --git a/test/scripts/helpers/open_graph.js b/test/scripts/helpers/open_graph.js
index dd43e70cb2..eae3c51673 100644
--- a/test/scripts/helpers/open_graph.js
+++ b/test/scripts/helpers/open_graph.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const moment = require('moment');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('open_graph', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/paginator.js b/test/scripts/helpers/paginator.js
index 8f2c1ab416..6bdd23ca79 100644
--- a/test/scripts/helpers/paginator.js
+++ b/test/scripts/helpers/paginator.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('paginator', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/partial.js b/test/scripts/helpers/partial.js
index b7aad3dcaf..9355c833e8 100644
--- a/test/scripts/helpers/partial.js
+++ b/test/scripts/helpers/partial.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 const fs = require('hexo-fs');
diff --git a/test/scripts/helpers/relative_url.js b/test/scripts/helpers/relative_url.js
index f8720928f7..8f511747b4 100644
--- a/test/scripts/helpers/relative_url.js
+++ b/test/scripts/helpers/relative_url.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('relative_url', () => {
   const relativeURL = require('../../../lib/plugins/helper/relative_url');
diff --git a/test/scripts/helpers/render.js b/test/scripts/helpers/render.js
index 65b58b2e70..568af34c0f 100644
--- a/test/scripts/helpers/render.js
+++ b/test/scripts/helpers/render.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('render', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/helpers/search_form.js b/test/scripts/helpers/search_form.js
index b40a6a9c15..a008e93e6e 100644
--- a/test/scripts/helpers/search_form.js
+++ b/test/scripts/helpers/search_form.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('search_form', () => {
   const searchForm = require('../../../lib/plugins/helper/search_form').bind({
diff --git a/test/scripts/helpers/tagcloud.js b/test/scripts/helpers/tagcloud.js
index 4fca652d34..605e75189b 100644
--- a/test/scripts/helpers/tagcloud.js
+++ b/test/scripts/helpers/tagcloud.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('tagcloud', () => {
diff --git a/test/scripts/helpers/toc.js b/test/scripts/helpers/toc.js
index 9f398d6b2c..02c2cd17f6 100644
--- a/test/scripts/helpers/toc.js
+++ b/test/scripts/helpers/toc.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 function ifTrue(cond, yes, no) {
   return cond ? yes : no;
diff --git a/test/scripts/helpers/url_for.js b/test/scripts/helpers/url_for.js
index 4ab3c4f0ba..f1e1ae1fc3 100644
--- a/test/scripts/helpers/url_for.js
+++ b/test/scripts/helpers/url_for.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('url_for', () => {
   const ctx = {
diff --git a/test/scripts/hexo/hexo.js b/test/scripts/hexo/hexo.js
index a1d6fd2278..de3290fb98 100644
--- a/test/scripts/hexo/hexo.js
+++ b/test/scripts/hexo/hexo.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/hexo/load_config.js b/test/scripts/hexo/load_config.js
index 5083dffe08..253a37921b 100644
--- a/test/scripts/hexo/load_config.js
+++ b/test/scripts/hexo/load_config.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const cloneDeep = require('lodash/cloneDeep');
diff --git a/test/scripts/hexo/load_database.js b/test/scripts/hexo/load_database.js
index 3c2b0b1766..770e30fe35 100644
--- a/test/scripts/hexo/load_database.js
+++ b/test/scripts/hexo/load_database.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 
diff --git a/test/scripts/hexo/load_plugins.js b/test/scripts/hexo/load_plugins.js
index 1dfad9e894..cdf8aef921 100644
--- a/test/scripts/hexo/load_plugins.js
+++ b/test/scripts/hexo/load_plugins.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const fs = require('hexo-fs');
 const pathFn = require('path');
 const Promise = require('bluebird');
diff --git a/test/scripts/hexo/locals.js b/test/scripts/hexo/locals.js
index 1aaceb59e4..f1addb2469 100644
--- a/test/scripts/hexo/locals.js
+++ b/test/scripts/hexo/locals.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 
 describe('Locals', () => {
diff --git a/test/scripts/hexo/multi_config_path.js b/test/scripts/hexo/multi_config_path.js
index 281a622772..3247c5a3c9 100644
--- a/test/scripts/hexo/multi_config_path.js
+++ b/test/scripts/hexo/multi_config_path.js
@@ -2,7 +2,6 @@
 
 const pathFn = require('path');
 const osFn = require('os');
-const should = require('chai').should(); // eslint-disable-line
 const fs = require('hexo-fs');
 const yml = require('js-yaml');
 
diff --git a/test/scripts/hexo/post.js b/test/scripts/hexo/post.js
index 8cb357f5e4..2be4b02f28 100644
--- a/test/scripts/hexo/post.js
+++ b/test/scripts/hexo/post.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const moment = require('moment');
 const Promise = require('bluebird');
diff --git a/test/scripts/hexo/router.js b/test/scripts/hexo/router.js
index 3baa8ae4b1..eb46e74fd4 100644
--- a/test/scripts/hexo/router.js
+++ b/test/scripts/hexo/router.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 const Readable = require('stream').Readable;
 const pathFn = require('path');
diff --git a/test/scripts/hexo/scaffold.js b/test/scripts/hexo/scaffold.js
index 69bfcafebe..26b0fe93a3 100644
--- a/test/scripts/hexo/scaffold.js
+++ b/test/scripts/hexo/scaffold.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const Promise = require('bluebird');
 const fs = require('hexo-fs');
diff --git a/test/scripts/hexo/update_package.js b/test/scripts/hexo/update_package.js
index 054a9a321d..66f027b478 100644
--- a/test/scripts/hexo/update_package.js
+++ b/test/scripts/hexo/update_package.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 
diff --git a/test/scripts/models/asset.js b/test/scripts/models/asset.js
index e7ae66de4b..0182dbe464 100644
--- a/test/scripts/models/asset.js
+++ b/test/scripts/models/asset.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 
diff --git a/test/scripts/models/cache.js b/test/scripts/models/cache.js
index 28f07fc166..6a3c00d4c0 100644
--- a/test/scripts/models/cache.js
+++ b/test/scripts/models/cache.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 
 describe('Cache', () => {
diff --git a/test/scripts/models/category.js b/test/scripts/models/category.js
index 303e8b2de7..80dbb7f634 100644
--- a/test/scripts/models/category.js
+++ b/test/scripts/models/category.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const Promise = require('bluebird');
 
diff --git a/test/scripts/models/moment.js b/test/scripts/models/moment.js
index 3b17100310..14781b9ca5 100644
--- a/test/scripts/models/moment.js
+++ b/test/scripts/models/moment.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const moment = require('moment-timezone');
 
 describe('SchemaTypeMoment', () => {
diff --git a/test/scripts/models/page.js b/test/scripts/models/page.js
index 69d6a43041..a4efe34781 100644
--- a/test/scripts/models/page.js
+++ b/test/scripts/models/page.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 
diff --git a/test/scripts/models/post.js b/test/scripts/models/post.js
index 5ba9b9132a..0b05b83014 100644
--- a/test/scripts/models/post.js
+++ b/test/scripts/models/post.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 const Promise = require('bluebird');
diff --git a/test/scripts/models/post_asset.js b/test/scripts/models/post_asset.js
index ad1842d762..bea7ccaf83 100644
--- a/test/scripts/models/post_asset.js
+++ b/test/scripts/models/post_asset.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 
diff --git a/test/scripts/models/tag.js b/test/scripts/models/tag.js
index 0ef644d6e7..691a4085fb 100644
--- a/test/scripts/models/tag.js
+++ b/test/scripts/models/tag.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const Promise = require('bluebird');
 
diff --git a/test/scripts/processors/asset.js b/test/scripts/processors/asset.js
index f1b3771c04..03e8d955b4 100644
--- a/test/scripts/processors/asset.js
+++ b/test/scripts/processors/asset.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/processors/common.js b/test/scripts/processors/common.js
index edb95e0e50..c0930038ca 100644
--- a/test/scripts/processors/common.js
+++ b/test/scripts/processors/common.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const moment = require('moment');
 
 describe('common', () => {
diff --git a/test/scripts/processors/data.js b/test/scripts/processors/data.js
index de2a6ab1f7..c980c5ac15 100644
--- a/test/scripts/processors/data.js
+++ b/test/scripts/processors/data.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 const fs = require('hexo-fs');
 const pathFn = require('path');
diff --git a/test/scripts/processors/post.js b/test/scripts/processors/post.js
index 04caa59d40..cceb9e2552 100644
--- a/test/scripts/processors/post.js
+++ b/test/scripts/processors/post.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/renderers/json.js b/test/scripts/renderers/json.js
index f330c64f3d..aa7896229b 100644
--- a/test/scripts/renderers/json.js
+++ b/test/scripts/renderers/json.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('json', () => {
   const r = require('../../../lib/plugins/renderer/json');
diff --git a/test/scripts/renderers/plain.js b/test/scripts/renderers/plain.js
index 6d95ec4cdb..18d1ec0382 100644
--- a/test/scripts/renderers/plain.js
+++ b/test/scripts/renderers/plain.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('plain', () => {
   const r = require('../../../lib/plugins/renderer/plain');
diff --git a/test/scripts/renderers/swig.js b/test/scripts/renderers/swig.js
index fe5d0cda3c..53727bb163 100644
--- a/test/scripts/renderers/swig.js
+++ b/test/scripts/renderers/swig.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('swig', () => {
   const r = require('../../../lib/plugins/renderer/swig');
diff --git a/test/scripts/renderers/yaml.js b/test/scripts/renderers/yaml.js
index f911145069..3f734d1766 100644
--- a/test/scripts/renderers/yaml.js
+++ b/test/scripts/renderers/yaml.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('yaml', () => {
   const r = require('../../../lib/plugins/renderer/yaml');
diff --git a/test/scripts/tags/asset_img.js b/test/scripts/tags/asset_img.js
index b055be4a06..f30049a4f3 100644
--- a/test/scripts/tags/asset_img.js
+++ b/test/scripts/tags/asset_img.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('asset_img', () => {
diff --git a/test/scripts/tags/asset_link.js b/test/scripts/tags/asset_link.js
index 93001aca51..d95697b724 100644
--- a/test/scripts/tags/asset_link.js
+++ b/test/scripts/tags/asset_link.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('asset_link', () => {
diff --git a/test/scripts/tags/asset_path.js b/test/scripts/tags/asset_path.js
index 023a7e8bdf..60c50086fe 100644
--- a/test/scripts/tags/asset_path.js
+++ b/test/scripts/tags/asset_path.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const Promise = require('bluebird');
 
 describe('asset_path', () => {
diff --git a/test/scripts/tags/blockquote.js b/test/scripts/tags/blockquote.js
index 20d6755f75..a2f255a6cf 100644
--- a/test/scripts/tags/blockquote.js
+++ b/test/scripts/tags/blockquote.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('blockquote', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/tags/code.js b/test/scripts/tags/code.js
index 6fa4ea6e3d..885d593e3a 100644
--- a/test/scripts/tags/code.js
+++ b/test/scripts/tags/code.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const util = require('hexo-util');
 const cheerio = require('cheerio');
 
diff --git a/test/scripts/tags/gist.js b/test/scripts/tags/gist.js
index 9763f2f3d0..5520e82aeb 100644
--- a/test/scripts/tags/gist.js
+++ b/test/scripts/tags/gist.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('gist', () => {
   const gist = require('../../../lib/plugins/tag/gist');
diff --git a/test/scripts/tags/iframe.js b/test/scripts/tags/iframe.js
index 2c6ee814ae..23422cdf99 100644
--- a/test/scripts/tags/iframe.js
+++ b/test/scripts/tags/iframe.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('iframe', () => {
   const iframe = require('../../../lib/plugins/tag/iframe');
diff --git a/test/scripts/tags/img.js b/test/scripts/tags/img.js
index 856c720b1f..432d695b53 100644
--- a/test/scripts/tags/img.js
+++ b/test/scripts/tags/img.js
@@ -2,7 +2,6 @@
 
 const pathFn = require('path');
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('img', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/tags/include_code.js b/test/scripts/tags/include_code.js
index 97ab8afdcd..d12f3b8ebe 100644
--- a/test/scripts/tags/include_code.js
+++ b/test/scripts/tags/include_code.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const pathFn = require('path');
-const should = require('chai').should(); // eslint-disable-line
 const fs = require('hexo-fs');
 const highlight = require('hexo-util').highlight;
 const Promise = require('bluebird');
diff --git a/test/scripts/tags/jsfiddle.js b/test/scripts/tags/jsfiddle.js
index 92d3761c1f..55a85a5a4f 100644
--- a/test/scripts/tags/jsfiddle.js
+++ b/test/scripts/tags/jsfiddle.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('jsfiddle', () => {
   const jsfiddle = require('../../../lib/plugins/tag/jsfiddle');
diff --git a/test/scripts/tags/link.js b/test/scripts/tags/link.js
index 020dacc9dd..29884a2a89 100644
--- a/test/scripts/tags/link.js
+++ b/test/scripts/tags/link.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('link', () => {
   const link = require('../../../lib/plugins/tag/link');
diff --git a/test/scripts/tags/post_link.js b/test/scripts/tags/post_link.js
index aea7058d62..af7db1f435 100644
--- a/test/scripts/tags/post_link.js
+++ b/test/scripts/tags/post_link.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('post_link', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/tags/post_path.js b/test/scripts/tags/post_path.js
index 931aa7f163..260a2ec818 100644
--- a/test/scripts/tags/post_path.js
+++ b/test/scripts/tags/post_path.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('post_path', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/tags/pullquote.js b/test/scripts/tags/pullquote.js
index eed1f40c63..acc0dc9f62 100644
--- a/test/scripts/tags/pullquote.js
+++ b/test/scripts/tags/pullquote.js
@@ -1,4 +1,4 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
 
 describe('pullquote', () => {
   const Hexo = require('../../../lib/hexo');
diff --git a/test/scripts/tags/vimeo.js b/test/scripts/tags/vimeo.js
index f4f0e99f21..25a0f1fd12 100644
--- a/test/scripts/tags/vimeo.js
+++ b/test/scripts/tags/vimeo.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('vimeo', () => {
   const vimeo = require('../../../lib/plugins/tag/vimeo');
diff --git a/test/scripts/tags/youtube.js b/test/scripts/tags/youtube.js
index d2d055d526..8e14196359 100644
--- a/test/scripts/tags/youtube.js
+++ b/test/scripts/tags/youtube.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const cheerio = require('cheerio');
-const should = require('chai').should(); // eslint-disable-line
 
 describe('youtube', () => {
   const youtube = require('../../../lib/plugins/tag/youtube');
diff --git a/test/scripts/theme/theme.js b/test/scripts/theme/theme.js
index e2d92e131f..67bdebae5b 100644
--- a/test/scripts/theme/theme.js
+++ b/test/scripts/theme/theme.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/theme/view.js b/test/scripts/theme/view.js
index f5497f4558..a48560ffff 100644
--- a/test/scripts/theme/view.js
+++ b/test/scripts/theme/view.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/theme_processors/config.js b/test/scripts/theme_processors/config.js
index 1b6d547ea1..5e8dd68d62 100644
--- a/test/scripts/theme_processors/config.js
+++ b/test/scripts/theme_processors/config.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const sinon = require('sinon');
 const pathFn = require('path');
 const fs = require('hexo-fs');
diff --git a/test/scripts/theme_processors/i18n.js b/test/scripts/theme_processors/i18n.js
index cabb222e0d..24859babd6 100644
--- a/test/scripts/theme_processors/i18n.js
+++ b/test/scripts/theme_processors/i18n.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/theme_processors/source.js b/test/scripts/theme_processors/source.js
index 20d2674c88..b351d3d83a 100644
--- a/test/scripts/theme_processors/source.js
+++ b/test/scripts/theme_processors/source.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');
diff --git a/test/scripts/theme_processors/view.js b/test/scripts/theme_processors/view.js
index 9b2e2d4c98..64224fc537 100644
--- a/test/scripts/theme_processors/view.js
+++ b/test/scripts/theme_processors/view.js
@@ -1,4 +1,5 @@
-const should = require('chai').should(); // eslint-disable-line
+'use strict';
+
 const pathFn = require('path');
 const fs = require('hexo-fs');
 const Promise = require('bluebird');