diff --git a/.travis.yml b/.travis.yml
index ba678db..1d4b500 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ install:
 - go get github.com/rogpeppe/fastuuid
 - go get golang.org/x/net/context
 - go get gopkg.in/mgo.v2
+- go get github.com/smartystreets/goconvey/convey
 before_script:
 - go vet -x ./...
 script:
diff --git a/README.md b/README.md
index 63ce14c..cb1a760 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ Building with the source
 ```
 go get -u github.com/shunfei/cronsun
 cd $GOPATH/src/github.com/shunfei/cronsun
-sh ./build.sh
+sh build.sh
 ```
 
 Or install with the binary [releases](https://github.com/shunfei/cronsun/releases)
diff --git a/node/cron/cron_test.go b/node/cron/cron_test.go
index f74c9b3..87fc93a 100644
--- a/node/cron/cron_test.go
+++ b/node/cron/cron_test.go
@@ -2,7 +2,9 @@ package cron
 
 import (
 	"fmt"
+	"reflect"
 	"sync"
+	"sync/atomic"
 	"testing"
 	"time"
 )
@@ -26,6 +28,10 @@ func TestFuncPanicRecovery(t *testing.T) {
 
 type DummyJob struct{}
 
+func (d DummyJob) GetID() string {
+	return fmt.Sprintf("pointer[%v]", reflect.ValueOf(&d).Pointer())
+}
+
 func (d DummyJob) Run() {
 	panic("YOLO")
 }
@@ -115,12 +121,12 @@ func TestAddWhileRunningWithDelay(t *testing.T) {
 	cron.Start()
 	defer cron.Stop()
 	time.Sleep(5 * time.Second)
-	var calls = 0
-	cron.AddFunc("* * * * * *", func() { calls += 1 })
+	var calls int32 = 0
+	cron.AddFunc("* * * * * *", func() { atomic.AddInt32(&calls, 1) })
 
 	<-time.After(ONE_SECOND)
-	if calls != 1 {
-		fmt.Printf("called %d times, expected 1\n", calls)
+	if atomic.LoadInt32(&calls) != 1 {
+		fmt.Printf("called %d times, expected 1\n", atomic.LoadInt32(&calls))
 		t.Fail()
 	}
 }
@@ -276,6 +282,10 @@ type testJob struct {
 	name string
 }
 
+func (t testJob) GetID() string {
+	return t.name
+}
+
 func (t testJob) Run() {
 	t.wg.Done()
 }