diff --git a/cshared_test.go b/cshared_test.go
index 76f2fe7..9f46343 100644
--- a/cshared_test.go
+++ b/cshared_test.go
@@ -40,10 +40,17 @@ func TestInputCallbackCtrlC(t *testing.T) {
 
 	ptr := unsafe.Pointer(nil)
 
-	go func() {
+	go func(test *testing.T) {
+		// prepare channel for input explicitly.
+		err := prepareInputCollector()
+		if err != nil {
+			test.Fail()
+			return
+		}
+
 		FLBPluginInputCallback(&ptr, nil)
 		cdone <- true
-	}()
+	}(t)
 
 	select {
 	case <-cdone:
@@ -86,7 +93,13 @@ func TestInputCallbackDangle(t *testing.T) {
 	cdone := make(chan bool)
 	ptr := unsafe.Pointer(nil)
 
-	go func() {
+	// prepare channel for input explicitly.
+	err := prepareInputCollector()
+	if err != nil {
+		t.Fail()
+	}
+
+	go func(test *testing.T) {
 		t := time.NewTicker(collectInterval)
 		defer t.Stop()
 
@@ -99,7 +112,7 @@ func TestInputCallbackDangle(t *testing.T) {
 				return
 			}
 		}
-	}()
+	}(t)
 
 	timeout := time.NewTimer(5 * time.Second)
 
@@ -156,10 +169,17 @@ func TestInputCallbackInfinite(t *testing.T) {
 	cshutdown := make(chan bool)
 	ptr := unsafe.Pointer(nil)
 
-	go func() {
+	go func(test *testing.T) {
 		t := time.NewTicker(collectInterval)
 		defer t.Stop()
 
+		// prepare channel for input explicitly.
+		err := prepareInputCollector()
+		if err != nil {
+			test.Fail()
+			return
+		}
+
 		for {
 			select {
 			case <-t.C:
@@ -172,7 +192,7 @@ func TestInputCallbackInfinite(t *testing.T) {
 				return
 			}
 		}
-	}()
+	}(t)
 
 	timeout := time.NewTimer(10 * time.Second)
 	defer timeout.Stop()
@@ -237,10 +257,17 @@ func TestInputCallbackLatency(t *testing.T) {
 	cstarted := make(chan bool)
 	cmsg := make(chan []byte)
 
-	go func() {
+	go func(test *testing.T) {
 		t := time.NewTicker(collectInterval)
 		defer t.Stop()
 
+		// prepare channel for input explicitly.
+		err := prepareInputCollector()
+		if err != nil {
+			test.Fail()
+			return
+		}
+
 		buf, _ := testFLBPluginInputCallback()
 		if len(buf) > 0 {
 			cmsg <- buf
@@ -259,7 +286,7 @@ func TestInputCallbackLatency(t *testing.T) {
 				}
 			}
 		}
-	}()
+	}(t)
 
 	<-cstarted
 	fmt.Println("---- started")
@@ -363,6 +390,12 @@ func TestInputCallbackInfiniteConcurrent(t *testing.T) {
 
 	concurrentWait.Add(64)
 
+	// prepare channel for input explicitly.
+	err := prepareInputCollector()
+	if err != nil {
+		t.Fail()
+	}
+
 	go func(cstarted chan bool) {
 		ticker := time.NewTicker(time.Second * 1)
 		defer ticker.Stop()