add csi-test to vendor

vendor/github.com/golang/mock/mockgen/tests/empty_interface/input.go

@@ -0,0 +1,4 @@
+//go:generate mockgen -package empty_interface -destination mock.go -source input.go
+package empty_interface
+
+type Empty interface{}

vendor/github.com/golang/mock/mockgen/tests/empty_interface/mock.go

@@ -0,0 +1,32 @@
+// Code generated by MockGen. DO NOT EDIT.
+// Source: input.go
+
+// Package empty_interface is a generated GoMock package.
+package empty_interface
+
+import (
+	gomock "github.com/golang/mock/gomock"
+)
+
+// MockEmpty is a mock of Empty interface
+type MockEmpty struct {
+	ctrl     *gomock.Controller
+	recorder *MockEmptyMockRecorder
+}
+
+// MockEmptyMockRecorder is the mock recorder for MockEmpty
+type MockEmptyMockRecorder struct {
+	mock *MockEmpty
+}
+
+// NewMockEmpty creates a new mock instance
+func NewMockEmpty(ctrl *gomock.Controller) *MockEmpty {
+	mock := &MockEmpty{ctrl: ctrl}
+	mock.recorder = &MockEmptyMockRecorder{mock}
+	return mock
+}
+
+// EXPECT returns an object that allows the caller to indicate expected use
+func (m *MockEmpty) EXPECT() *MockEmptyMockRecorder {
+	return m.recorder
+}