diff --git a/.travis.yml b/.travis.yml
index 03736ab2..86060430 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ node_js:
   - '4'
   - '6'
 install:
-  - npm i npminstall && npminstall
+  - npm i npminstall@beta && npminstall
 script:
   - npm run ci
 after_script:
diff --git a/appveyor.yml b/appveyor.yml
index e4893768..b1f1cf32 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,7 +5,7 @@ environment:
 
 install:
   - ps: Install-Product node $env:nodejs_version
-  - npm i npminstall && node_modules\.bin\npminstall
+  - npm i npminstall@beta && node_modules\.bin\npminstall
 
 test_script:
   - node --version
diff --git a/lib/cov_command.js b/lib/cov_command.js
index 0d54c474..663abbb0 100644
--- a/lib/cov_command.js
+++ b/lib/cov_command.js
@@ -15,7 +15,7 @@ class CovCommand extends Command {
     ];
   }
 
-  * run(cwd) {
+  * run(cwd, args) {
     process.env.NODE_ENV = 'test';
     process.env.TMPDIR = path.join(cwd, '.tmp');
     mkdirp.sync(process.env.TMPDIR);
@@ -30,7 +30,7 @@ class CovCommand extends Command {
     rimraf.sync(coverageDir);
 
     // save coverage-xxxx.json to $PWD/coverage
-    const covArgs = this.getCovArgs();
+    const covArgs = this.getCovArgs(args);
     yield this.helper.forkNode(covFile, covArgs, opt);
     rimraf.sync(process.env.TMPDIR);
 
@@ -47,7 +47,7 @@ class CovCommand extends Command {
     this.excludes.push(exclude);
   }
 
-  getCovArgs() {
+  getCovArgs(args) {
     let covArgs = [
       'cover',
       '--report', 'none',
@@ -63,7 +63,7 @@ class CovCommand extends Command {
       '--',
       '--timeout', process.env.TEST_TIMEOUT || '200000',
       '--require', require.resolve('thunk-mocha'),
-    ]).concat(this.helper.getTestFiles());
+    ]).concat(this.helper.getTestFiles()).concat(args);
 
     return covArgs;
   }
diff --git a/lib/test_command.js b/lib/test_command.js
index eec3977b..f9fd1bfc 100644
--- a/lib/test_command.js
+++ b/lib/test_command.js
@@ -1,17 +1,16 @@
 'use strict';
 
 const mochaFile = require.resolve('mocha/bin/_mocha');
-const thunkMocha = require.resolve('thunk-mocha');
 const Command = require('./command');
 
 class TestCommand extends Command {
-  * run() {
-    const args = [
+  * run(_, args) {
+    args = [
       mochaFile,
       '--reporter', process.env.TEST_REPORTER || 'spec',
       '--timeout', process.env.TEST_TIMEOUT || '30000',
-      '--require', thunkMocha,
-    ].concat(this.helper.getTestFiles());
+      '--require', require.resolve('thunk-mocha'),
+    ].concat(this.helper.getTestFiles()).concat(args);
     process.env.NODE_ENV = 'test';
 
     const opt = {
diff --git a/package.json b/package.json
index 44c8e44a..0309ae97 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,9 @@
     "egg-ci": "1",
     "eslint": "3",
     "eslint-config-egg": "3",
-    "mm": "1"
+    "intelli-espower-loader": "^1.0.1",
+    "mm": "1",
+    "power-assert": "^1.4.1"
   },
   "repository": {
     "type": "git",
@@ -37,8 +39,8 @@
   "author": "fengmk2 <fengmk2@gmail.com> (https://fengmk2.com)",
   "scripts": {
     "lint": "eslint --fix bin lib test *.js",
-    "test": "TEST_TIMEOUT=3600000 TESTS=test/*.test.js bin/egg-bin.js test",
-    "cov": "TEST_TIMEOUT=3600000 TESTS=test/*.test.js bin/egg-bin.js cov",
+    "test": "TEST_TIMEOUT=3600000 TESTS=test/*.test.js bin/egg-bin.js test -r intelli-espower-loader",
+    "cov": "TEST_TIMEOUT=3600000 TESTS=test/*.test.js bin/egg-bin.js cov -r intelli-espower-loader",
     "ci": "npm run lint && npm run cov",
     "autod": "autod -e test/fixtures -f '^' -w"
   },
diff --git a/test/egg-cov.test.js b/test/egg-cov.test.js
index c3c252c2..c38eb50c 100644
--- a/test/egg-cov.test.js
+++ b/test/egg-cov.test.js
@@ -2,7 +2,7 @@
 
 const fs = require('fs');
 const path = require('path');
-const assert = require('assert');
+const assert = require('power-assert');
 const coffee = require('coffee');
 const mm = require('mm');
 
@@ -51,4 +51,18 @@ describe('egg-bin cov', () => {
     .expect('code', 1)
     .end(done);
   });
+
+  it('should fail when test fail with power-assert', done => {
+    mm(process.env, 'TESTS', 'test/power-assert-fail.js');
+    coffee.fork(eggBin, [ 'cov', '-r', 'intelli-espower-loader' ], {
+      cwd: appdir,
+    })
+    .coverage(false)
+    // .debug()
+    .expect('stdout', /1\) should fail/)
+    .expect('stdout', /1 failing/)
+    .expect('stdout', /assert\(1 === 2\)/)
+    .expect('code', 1)
+    .end(done);
+  });
 });
diff --git a/test/egg-test.test.js b/test/egg-test.test.js
index 570e5733..d8d2f352 100644
--- a/test/egg-test.test.js
+++ b/test/egg-test.test.js
@@ -1,36 +1,33 @@
 'use strict';
 
 const path = require('path');
-const assert = require('assert');
+const assert = require('power-assert');
 const coffee = require('coffee');
 const mm = require('mm');
 
 describe('egg-bin test', () => {
   const eggBin = require.resolve('../bin/egg-bin.js');
+  const cwd = path.join(__dirname, 'fixtures/test-files');
 
   afterEach(mm.restore);
 
   it('should success', done => {
     mm(process.env, 'TESTS', 'test/**/*.test.js');
-    coffee.fork(eggBin, [ 'test' ], {
-      cwd: path.join(__dirname, 'fixtures/test-files'),
-    })
+    coffee.fork(eggBin, [ 'test' ], { cwd })
     .expect('stdout', /✓ should success/)
     .expect('stdout', /a\.test\.js/)
     .expect('stdout', /b\/b\.test\.js/)
     .expect('code', 0)
     .end((err, res) => {
       assert.ifError(err);
-      assert.ok(!/a.js/.test(res.stdout));
+      assert.ok(!/a\.js/.test(res.stdout));
       done();
     });
   });
 
   it('should only test files specified by TESTS', done => {
     mm(process.env, 'TESTS', 'test/a.test.js');
-    coffee.fork(eggBin, [ 'test' ], {
-      cwd: path.join(__dirname, 'fixtures/test-files'),
-    })
+    coffee.fork(eggBin, [ 'test' ], { cwd })
     .expect('stdout', /✓ should success/)
     .expect('stdout', /a\.test\.js/)
     .expect('code', 0)
@@ -44,9 +41,7 @@ describe('egg-bin test', () => {
   it('should use process.env.TEST_REPORTER', done => {
     mm(process.env, 'TESTS', 'test/**/*.test.js');
     mm(process.env, 'TEST_REPORTER', 'dot');
-    coffee.fork(eggBin, [ 'test' ], {
-      cwd: path.join(__dirname, 'fixtures/test-files'),
-    })
+    coffee.fork(eggBin, [ 'test' ], { cwd })
     .expect('stdout', /․․\n/)
     .expect('code', 0)
     .end((err, res) => {
@@ -59,14 +54,24 @@ describe('egg-bin test', () => {
   it('should use process.env.TEST_TIMEOUT', done => {
     mm(process.env, 'TESTS', 'test/**/*.test.js');
     mm(process.env, 'TEST_TIMEOUT', '60000');
-    coffee.fork(eggBin, [ 'test' ], {
-      cwd: path.join(__dirname, 'fixtures/test-files'),
-    })
+    coffee.fork(eggBin, [ 'test' ], { cwd })
     .expect('stdout', /✓ should success/)
     .expect('code', 0)
     .end(done);
   });
 
+  it('should fail when test fail with power-assert', done => {
+    mm(process.env, 'TESTS', 'test/power-assert-fail.js');
+    coffee.fork(eggBin, [ 'cov', '-r', 'intelli-espower-loader' ], { cwd })
+    .coverage(false)
+    // .debug()
+    .expect('stdout', /1\) should fail/)
+    .expect('stdout', /assert\(1 === 2\)/)
+    .expect('stdout', /1 failing/)
+    .expect('code', 1)
+    .end(done);
+  });
+
   it.skip('should check node dependencies fail', done => {
     coffee.fork(eggBin, [ 'test' ], {
       cwd: path.join(__dirname, 'fixtures/check-deps-fail'),
diff --git a/test/fixtures/test-files/test/power-assert-fail.js b/test/fixtures/test-files/test/power-assert-fail.js
new file mode 100644
index 00000000..6dfccb32
--- /dev/null
+++ b/test/fixtures/test-files/test/power-assert-fail.js
@@ -0,0 +1,9 @@
+'use strict';
+
+const assert = require('power-assert');
+
+describe('power-assert-fail.js', () => {
+  it('should fail', () => {
+    assert(1 === 2);
+  });
+});
diff --git a/test/my-egg-bin.test.js b/test/my-egg-bin.test.js
index 29beec1a..4b835f15 100644
--- a/test/my-egg-bin.test.js
+++ b/test/my-egg-bin.test.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const path = require('path');
-const assert = require('assert');
+const assert = require('power-assert');
 const coffee = require('coffee');
 const mm = require('mm');