add csi-test to vendor

vendor/github.com/golang/mock/sample/concurrent/concurrent_test.go

@@ -0,0 +1,46 @@
+package concurrent
+
+import (
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"golang.org/x/net/context"
+
+	mock "github.com/golang/mock/sample/concurrent/mock"
+)
+
+func call(ctx context.Context, m Math) (int, error) {
+	result := make(chan int)
+	go func() {
+		result <- m.Sum(1, 2)
+		close(result)
+	}()
+	select {
+	case r := <-result:
+		return r, nil
+	case <-ctx.Done():
+		return 0, ctx.Err()
+	}
+}
+
+// testConcurrentFails is expected to fail (and is disabled). It
+// demonstrates how to use gomock.WithContext to interrupt the test
+// from a different goroutine.
+func testConcurrentFails(t *testing.T) {
+	ctrl, ctx := gomock.WithContext(context.Background(), t)
+	defer ctrl.Finish()
+	m := mock.NewMockMath(ctrl)
+	if _, err := call(ctx, m); err != nil {
+		t.Error("call failed:", err)
+	}
+}
+
+func TestConcurrentWorks(t *testing.T) {
+	ctrl, ctx := gomock.WithContext(context.Background(), t)
+	defer ctrl.Finish()
+	m := mock.NewMockMath(ctrl)
+	m.EXPECT().Sum(1, 2).Return(3)
+	if _, err := call(ctx, m); err != nil {
+		t.Error("call failed:", err)
+	}
+}