diff --git a/render/render_test.go b/render/render_test.go
index 95a01b63..16384853 100644
--- a/render/render_test.go
+++ b/render/render_test.go
@@ -17,6 +17,7 @@ import (
 
 	"github.com/golang/protobuf/proto"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
 	"github.com/ugorji/go/codec"
 
 	testdata "github.com/gin-gonic/gin/testdata/protoexample"
@@ -125,6 +126,46 @@ func TestRenderSecureJSON(t *testing.T) {
 	assert.Equal(t, "application/json; charset=utf-8", w2.Header().Get("Content-Type"))
 }
 
+type mockResponseRecorder struct {
+	mock.Mock
+	httptest.ResponseRecorder
+}
+
+func (m *mockResponseRecorder) Write(content []byte) (int, error) {
+	args := m.Called(content)
+	return args.Int(0), args.Error(1)
+}
+
+func TestRenderJsonpError3(t *testing.T) {
+	var m *mockResponseRecorder
+
+	data := map[string]interface{}{
+		"foo": "bar",
+	}
+
+	m = new(mockResponseRecorder)
+	m.On("Write", []byte("x")).Return(1, errors.New("mock callback write error"))
+	assert.Error(t, (JsonpJSON{"x", data}).Render(m), "mock callback write error")
+
+	m = new(mockResponseRecorder)
+	m.On("Write", []byte("x")).Return(1, nil)
+	m.On("Write", []byte("(")).Return(1, errors.New("mock ( write error"))
+	assert.Error(t, (JsonpJSON{"x", data}).Render(m), "mock ( write error")
+
+	m = new(mockResponseRecorder)
+	m.On("Write", []byte("x")).Return(1, nil)
+	m.On("Write", []byte("(")).Return(1, nil)
+	m.On("Write", []byte("{\"foo\":\"bar\"}")).Return(1, errors.New("mock ret write error"))
+	assert.Error(t, (JsonpJSON{"x", data}).Render(m), "mock ret write error")
+
+	m = new(mockResponseRecorder)
+	m.On("Write", []byte("x")).Return(1, nil)
+	m.On("Write", []byte("(")).Return(1, nil)
+	m.On("Write", []byte("{\"foo\":\"bar\"}")).Return(1, nil)
+	m.On("Write", []byte(");")).Return(1, errors.New("mock ); write error"))
+	assert.Error(t, (JsonpJSON{"x", data}).Render(m), "mock ); write error")
+}
+
 func TestRenderSecureJSONFail(t *testing.T) {
 	w := httptest.NewRecorder()
 	data := make(chan int)
diff --git a/vendor/vendor.json b/vendor/vendor.json
index d441d4a6..1d1723ea 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -112,6 +112,14 @@
 			"version": "v1.2",
 			"versionExact": "v1.2.2"
 		},
+		{
+			"checksumSHA1": "WmBSFdqpdYRIkp0I408JIZ3LDMY=",
+			"path": "github.com/stretchr/testify/mock",
+			"revision": "f35b8ab0b5a2cef36673838d662e249dd9c94686",
+			"revisionTime": "2018-05-06T18:05:49Z",
+			"version": "v1.2.2",
+			"versionExact": "v1.2.2"
+		},
 		{
 			"checksumSHA1": "S4ei9eSqVThDio0Jn2sav6yUbvg=",
 			"path": "github.com/ugorji/go/codec",