diff --git a/test/ts.test.ts b/test/ts.test.ts
index 5965d207..32e2e4d5 100644
--- a/test/ts.test.ts
+++ b/test/ts.test.ts
@@ -45,7 +45,7 @@ describe('test/ts.test.ts', () => {
 
     it('should start app', () => {
       return coffee.fork(eggBin, [ 'dev' ], { cwd })
-        // .debug()
+        .debug()
         .expect('stdout', /hi, egg, 12345/)
         .expect('stdout', /ts env: true/)
         .expect('stdout', /started/)