chore: import upstream snapshot with attribution

test/barrier_closure_unittest.cc

@@ -0,0 +1,36 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "butil/barrier_closure.h"
+
+#include "butil/bind.h"
+#include <gtest/gtest.h>
+
+namespace {
+
+void Increment(int* count) { (*count)++; }
+
+TEST(BarrierClosureTest, RunImmediatelyForZeroClosures) {
+  int count = 0;
+  butil::Closure doneClosure(butil::Bind(&Increment, butil::Unretained(&count)));
+
+  butil::Closure barrierClosure = butil::BarrierClosure(0, doneClosure);
+  EXPECT_EQ(1, count);
+}
+
+TEST(BarrierClosureTest, RunAfterNumClosures) {
+  int count = 0;
+  butil::Closure doneClosure(butil::Bind(&Increment, butil::Unretained(&count)));
+
+  butil::Closure barrierClosure = butil::BarrierClosure(2, doneClosure);
+  EXPECT_EQ(0, count);
+
+  barrierClosure.Run();
+  EXPECT_EQ(0, count);
+
+  barrierClosure.Run();
+  EXPECT_EQ(1, count);
+}
+
+}  // namespace