Memory-monitor for Mac.

content/browser/memory/memory_monitor_mac_unittest.cc

+// Copyright (c) 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 "content/browser/memory/memory_monitor_mac.h"
+
+#include "content/browser/memory/test_memory_monitor.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+// A delegate that allows mocking the various inputs to MemoryMonitorMac.
+class TestMemoryMonitorMacDelegate : public TestMemoryMonitorDelegate {
+ public:
+  TestMemoryMonitorMacDelegate() {}
+
+  void SetFreeMemoryKB(int free_kb) { mem_info_.free = free_kb; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestMemoryMonitorMacDelegate);
+};
+
+class TestMemoryMonitorMac : public MemoryMonitorMac {};
+
+static const int kKBperMB = 1024;
+
+}  // namespace
+
+class MemoryMonitorMacTest : public testing::Test {
+ public:
+  TestMemoryMonitorMacDelegate delegate_;
+  std::unique_ptr<MemoryMonitorMac> monitor_;
+};
+
+TEST_F(MemoryMonitorMacTest, Create) {
+  delegate_.SetTotalMemoryKB(100000 * kKBperMB);
+  monitor_ = MemoryMonitorMac::Create(&delegate_);
+  EXPECT_EQ(0U, delegate_.calls());
+}
+
+TEST_F(MemoryMonitorMacTest, GetFreeMemoryUntilCriticalMB) {
+  delegate_.SetTotalMemoryKB(1000 * kKBperMB);
+  delegate_.SetMemoryPressure(DISPATCH_MEMORYPRESSURE_NORMAL);
+
+  monitor_.reset(new MemoryMonitorMac(&delegate_));
+  EXPECT_EQ(0u, delegate_.calls());
+
+  delegate_.SetFreeMemoryKB(64 * kKBperMB);
+  EXPECT_EQ(64, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+
+  delegate_.SetFreeMemoryKB(64 * kKBperMB);
+  delegate_.SetMemoryPressure(DISPATCH_MEMORYPRESSURE_WARN);
+  EXPECT_EQ(32, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(31, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(30, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+
+  delegate_.SetMemoryPressure(DISPATCH_MEMORYPRESSURE_NORMAL);
+  EXPECT_EQ(31, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(32, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(33, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+
+  delegate_.SetFreeMemoryKB(64 * kKBperMB);
+  delegate_.SetMemoryPressure(DISPATCH_MEMORYPRESSURE_CRITICAL);
+  EXPECT_EQ(0, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(0, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+
+  delegate_.SetMemoryPressure(DISPATCH_MEMORYPRESSURE_NORMAL);
+  EXPECT_EQ(1, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(2, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+  EXPECT_EQ(3, monitor_->GetFreeMemoryUntilCriticalMB());
+  EXPECT_EQ(2U, delegate_.calls());
+  delegate_.ResetCalls();
+}
+
+}  // namespace content