diff --git a/lib/cmd/test.js b/lib/cmd/test.js
index c14b1efd..92629c3a 100644
--- a/lib/cmd/test.js
+++ b/lib/cmd/test.js
@@ -38,7 +38,10 @@ class TestCommand extends Command {
 
   * run(context) {
     const opt = {
-      env: Object.assign({ NODE_ENV: 'test' }, context.env),
+      env: Object.assign({
+        NODE_ENV: 'test',
+        EGG_TYPESCRIPT: context.argv.typescript,
+      }, context.env),
       execArgv: context.execArgv,
     };
     const mochaFile = require.resolve('mocha/bin/_mocha');
@@ -53,7 +56,7 @@ class TestCommand extends Command {
    * @return {Array} [ '--require=xxx', 'xx.test.js' ]
    * @protected
    */
-  formatTestArgs({ argv, debug }) {
+  formatTestArgs({ argv, debug, env }) {
     const testArgv = Object.assign({}, argv);
 
     /* istanbul ignore next */
diff --git a/test/fixtures/example-ts/test/index.test.ts b/test/fixtures/example-ts/test/index.test.ts
index 25c83639..a5b29892 100644
--- a/test/fixtures/example-ts/test/index.test.ts
+++ b/test/fixtures/example-ts/test/index.test.ts
@@ -1,16 +1,8 @@
 'use strict';
 
-import { Application, Context } from 'egg';
-import { default as mock, MockOption, BaseMockApplication } from 'egg-mock';
-import * as path from 'path';
+import { app } from 'egg-mock/bootstrap';
 
 describe('test/index.test.ts', () => {
-  let app: BaseMockApplication<Application, Context>;
-  before(() => {
-    app = mock.app({ typescript: true } as MockOption);
-    return app.ready();
-  });
-  after(() => app.close());
   it('should work', async () => {
     await app
       .httpRequest()
diff --git a/test/fixtures/ts/app.js b/test/fixtures/ts/app.ts
similarity index 100%
rename from test/fixtures/ts/app.js
rename to test/fixtures/ts/app.ts
diff --git a/test/ts.test.js b/test/ts.test.js
index 3993cd02..2038b91c 100644
--- a/test/ts.test.js
+++ b/test/ts.test.js
@@ -14,7 +14,7 @@ describe('test/ts.test.js', () => {
     cwd = path.join(__dirname, './fixtures/ts');
     mm(process.env, 'NODE_ENV', 'development');
     return coffee.fork(eggBin, [ 'dev', '--typescript' ], { cwd })
-      .debug()
+      // .debug()
       .expect('stdout', /### egg from ts/)
       .expect('stdout', /options.typescript=true/)
       .expect('stdout', /started/)
@@ -26,7 +26,7 @@ describe('test/ts.test.js', () => {
     cwd = path.join(__dirname, './fixtures/ts');
     mm(process.env, 'NODE_ENV', 'development');
     return coffee.fork(eggBin, [ 'test', '--typescript' ], { cwd })
-      .debug()
+      // .debug()
       .notExpect('stdout', /false == true/)
       .notExpect('stdout', /should not load js files/)
       .expect('stdout', /--- \[string\] 'wrong assert ts'/)
@@ -41,7 +41,7 @@ describe('test/ts.test.js', () => {
     }
     cwd = path.join(__dirname, './fixtures/example-ts');
     return coffee.fork(eggBin, [ 'dev', '--ts' ], { cwd })
-      .debug()
+      // .debug()
       .expect('stdout', /hi, egg, 12345/)
       .expect('stdout', /started/)
       .expect('code', 0)
@@ -55,7 +55,7 @@ describe('test/ts.test.js', () => {
     }
     cwd = path.join(__dirname, './fixtures/example-ts');
     return coffee.fork(eggBin, [ 'test', '--ts' ], { cwd })
-      .debug()
+      // .debug()
       .expect('stdout', /hi, egg, 123456/)
       .expect('stdout', /should work/)
       .expect('code', 0)