Helium: Initial proto and Syncable interface definition

blimp/net/helium/vector_clock_generator_unittest.cc

+// Copyright 2016 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 "blimp/net/helium/vector_clock_generator.h"
+
+#include "base/macros.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blimp {
+namespace {
+
+class VectorClockGeneratorTest : public testing::Test {
+ public:
+  VectorClockGeneratorTest() {}
+  ~VectorClockGeneratorTest() override {}
+
+ protected:
+  VectorClockGenerator gen_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VectorClockGeneratorTest);
+};
+
+TEST_F(VectorClockGeneratorTest, CheckCurrentDoesntIncrease) {
+  VectorClock c1 = gen_.current();
+  EXPECT_EQ(VectorClock::Comparison::EqualTo, c1.CompareTo(gen_.current()));
+}
+
+TEST_F(VectorClockGeneratorTest, MonotonicallyIncreasing) {
+  VectorClock c1 = gen_.current();
+  gen_.Increment();
+  VectorClock c2 = gen_.current();
+  EXPECT_EQ(VectorClock::Comparison::GreaterThan, c2.CompareTo(c1));
+  EXPECT_EQ(VectorClock::Comparison::EqualTo, c2.CompareTo(gen_.current()));
+}
+
+}  // namespace
+}  // namespace blimp