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// Copyright 2022 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/browser/ash/guest_os/infra/cached_callback.h"
#include <atomic>
#include <memory>
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/task/thread_pool.h"
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#include "chrome/browser/ash/borealis/testing/callback_factory.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace guest_os {
namespace {
using ::testing::_;
using ::testing::Invoke;
enum class TestErrors {
kFoo = 0,
};
class SuccessfulCache : public CachedCallback<std::string, TestErrors> {
public:
~SuccessfulCache() override = default;
// CachedCallback overrides.
void Build(RealCallback callback) override {
std::move(callback).Run(Success("success"));
}
};
TEST(CachedCallbackTest, IsNullInitially) {
SuccessfulCache sc;
EXPECT_EQ(sc.MaybeGet(), nullptr);
EXPECT_FALSE(sc.Invalidate());
}
TEST(CachedCallbackTest, SuccessIsPropagated) {
SuccessfulCache sc;
borealis::NiceCallbackFactory<void(SuccessfulCache::Result)> callbacks;
EXPECT_CALL(callbacks, Call(_))
.WillOnce(Invoke([](SuccessfulCache::Result result) {
EXPECT_TRUE(result.has_value());
EXPECT_EQ(*result.value(), "success");
}));
sc.Get(callbacks.BindOnce());
EXPECT_NE(sc.MaybeGet(), nullptr);
}
class CountingCache : public SuccessfulCache {
public:
~CountingCache() override = default;
// CachedCallback overrides.
void Build(RealCallback callback) override {
build_cached_object_count++;
return SuccessfulCache::Build(std::move(callback));
}
int build_cached_object_count = 0;
};
TEST(CachedCallbackTest, ReUsesSameObject) {
CountingCache cc;
EXPECT_EQ(cc.build_cached_object_count, 0);
cc.Get(base::DoNothing());
cc.Get(base::DoNothing());
EXPECT_EQ(cc.build_cached_object_count, 1);
cc.Invalidate();
cc.Get(base::DoNothing());
EXPECT_EQ(cc.build_cached_object_count, 2);
}
class FailureCache : public SuccessfulCache {
public:
~FailureCache() override = default;
// CachedCallback overrides.
void Build(RealCallback callback) override {
std::move(callback).Run(Failure(TestErrors::kFoo));
}
};
TEST(CachedCallbackTest, FailureIsPropagated) {
FailureCache fc;
borealis::NiceCallbackFactory<void(FailureCache::Result)> callbacks;
EXPECT_CALL(callbacks, Call(_))
.WillOnce(Invoke([](FailureCache::Result result) {
EXPECT_FALSE(result.has_value());
EXPECT_EQ(result.error(), TestErrors::kFoo);
}));
fc.Get(callbacks.BindOnce());
}
class DelayedCache : public SuccessfulCache {
public:
~DelayedCache() override = default;
void DelayCallback(RealCallback callback) {
// Busy loop until needed.
while (delay) {
continue;
}
std::move(callback).Run(
SuccessfulCache::RealResult(std::make_unique<std::string>("success")));
}
// CachedCallback overrides.
void Build(RealCallback callback) override {
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock()},
base::BindOnce(&DelayedCache::DelayCallback, base::Unretained(this),
std::move(callback)));
}
std::atomic_bool delay = true;
};
MATCHER(ExpectedTrue, "") {
return arg.has_value();
}
TEST(CachedCallbackTest, CanEnqueueCallbacks) {
base::test::TaskEnvironment task_environment_;
borealis::StrictCallbackFactory<void(DelayedCache::Result)> callbacks;
DelayedCache dc;
dc.Get(callbacks.BindOnce());
dc.Get(callbacks.BindOnce());
dc.Get(callbacks.BindOnce());
// We use a strict mock to show that the below expectation hasn't fired yet
// and therefore must be queued.
EXPECT_CALL(callbacks, Call(ExpectedTrue())).Times(3);
dc.delay = false;
task_environment_.RunUntilIdle();
}
class NonCompletingCache : public SuccessfulCache {
public:
~NonCompletingCache() override = default;
// CachedCallback overrides.
void Build(RealCallback callback) override {
// Do nothing.
}
};
TEST(CachedCallbackTest, CanAbort) {
borealis::StrictCallbackFactory<void(NonCompletingCache::Result)> callbacks;
auto ncc = std::make_unique<NonCompletingCache>();
ncc->Get(callbacks.BindOnce());
ncc->Get(callbacks.BindOnce());
ncc->Get(callbacks.BindOnce());
// Because we delete the cache, we expect the callbacks to be invoked with the
// result of Reject(), which is a default-constructed E unless overridden.
EXPECT_CALL(callbacks, Call(_))
.Times(3)
.WillRepeatedly(Invoke([](NonCompletingCache::Result res) {
EXPECT_FALSE(res.has_value());
EXPECT_EQ(res.error(), TestErrors::kFoo);
}));
ncc.reset();
}
} // namespace
} // namespace guest_os
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