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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/windows_services/elevated_tracing_service/process_watcher.h"
#include "base/run_loop.h"
#include "base/test/gmock_callback_support.h"
#include "base/test/mock_callback.h"
#include "chrome/windows_services/elevated_tracing_service/with_child_test.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace elevated_tracing_service {
// A test fixture for ProcessWatcher that has facilities for coordinating with a
// child process.
using ProcessWatcherTest = WithChildTest;
// Tests that ProcessWatcher runs its callback when the watched process
// terminates.
TEST_F(ProcessWatcherTest, ProcessExitsFirst) {
base::RunLoop run_loop;
::testing::StrictMock<base::MockOnceClosure> mock_closure;
EXPECT_CALL(mock_closure, Run())
.WillOnce(base::test::RunOnceClosure(run_loop.QuitClosure()));
// Spin off a child process and start watching it.
auto child_process = SpawnChildWithEventHandles(kExitWhenSignaled);
ASSERT_TRUE(child_process.IsValid());
ProcessWatcher watcher(std::move(child_process), mock_closure.Get());
// Signal the child to terminate.
SignalChildTermination();
// Wait for the watcher to notice that the child has terminated.
run_loop.Run();
}
// Tests that ProcessWatcher doesn't run its callback if it is destroyed before
// the watched process terminates.
TEST_F(ProcessWatcherTest, WatcherDiesFirst) {
// Start the child process and wait for it to get going.
auto child_process = SpawnChildWithEventHandles(kExitWhenSignaled);
ASSERT_TRUE(child_process.IsValid());
WaitForChildStart();
// Start and then stop watching the child; expecting the callback to not run.
::testing::StrictMock<base::MockOnceClosure> mock_closure;
ProcessWatcher(std::move(child_process), mock_closure.Get());
// Signal the child to terminate.
SignalChildTermination();
}
} // namespace elevated_tracing_service
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