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// Copyright (c) 2012 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 "base/memory/scoped_vector.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
// The LifeCycleObject notifies its Observer upon construction & destruction.
class LifeCycleObject {
public:
class Observer {
public:
virtual void OnLifeCycleConstruct(LifeCycleObject* o) = 0;
virtual void OnLifeCycleDestroy(LifeCycleObject* o) = 0;
protected:
virtual ~Observer() {}
};
explicit LifeCycleObject(Observer* observer)
: observer_(observer) {
observer_->OnLifeCycleConstruct(this);
}
~LifeCycleObject() {
observer_->OnLifeCycleDestroy(this);
}
private:
Observer* observer_;
DISALLOW_COPY_AND_ASSIGN(LifeCycleObject);
};
// The life cycle states we care about for the purposes of testing ScopedVector
// against objects.
enum LifeCycleState {
LC_INITIAL,
LC_CONSTRUCTED,
LC_DESTROYED,
};
// Because we wish to watch the life cycle of an object being constructed and
// destroyed, and further wish to test expectations against the state of that
// object, we cannot save state in that object itself. Instead, we use this
// pairing of the watcher, which observes the object and notifies of
// construction & destruction. Since we also may be testing assumptions about
// things not getting freed, this class also acts like a scoping object and
// deletes the |constructed_life_cycle_object_|, if any when the
// LifeCycleWatcher is destroyed. To keep this simple, the only expected state
// changes are:
// INITIAL -> CONSTRUCTED -> DESTROYED.
// Anything more complicated than that should start another test.
class LifeCycleWatcher : public LifeCycleObject::Observer {
public:
LifeCycleWatcher()
: life_cycle_state_(LC_INITIAL),
constructed_life_cycle_object_(NULL) {}
virtual ~LifeCycleWatcher() {}
// Assert INITIAL -> CONSTRUCTED and no LifeCycleObject associated with this
// LifeCycleWatcher.
virtual void OnLifeCycleConstruct(LifeCycleObject* object) OVERRIDE {
ASSERT_EQ(LC_INITIAL, life_cycle_state_);
ASSERT_EQ(NULL, constructed_life_cycle_object_.get());
life_cycle_state_ = LC_CONSTRUCTED;
constructed_life_cycle_object_.reset(object);
}
// Assert CONSTRUCTED -> DESTROYED and the |object| being destroyed is the
// same one we saw constructed.
virtual void OnLifeCycleDestroy(LifeCycleObject* object) OVERRIDE {
ASSERT_EQ(LC_CONSTRUCTED, life_cycle_state_);
LifeCycleObject* constructed_life_cycle_object =
constructed_life_cycle_object_.release();
ASSERT_EQ(constructed_life_cycle_object, object);
life_cycle_state_ = LC_DESTROYED;
}
LifeCycleState life_cycle_state() const { return life_cycle_state_; }
// Factory method for creating a new LifeCycleObject tied to this
// LifeCycleWatcher.
LifeCycleObject* NewLifeCycleObject() {
return new LifeCycleObject(this);
}
private:
LifeCycleState life_cycle_state_;
scoped_ptr<LifeCycleObject> constructed_life_cycle_object_;
DISALLOW_COPY_AND_ASSIGN(LifeCycleWatcher);
};
TEST(ScopedVectorTest, LifeCycleWatcher) {
LifeCycleWatcher watcher;
EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
LifeCycleObject* object = watcher.NewLifeCycleObject();
EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
delete object;
EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
}
TEST(ScopedVectorTest, Reset) {
LifeCycleWatcher watcher;
EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
ScopedVector<LifeCycleObject> scoped_vector;
scoped_vector.push_back(watcher.NewLifeCycleObject());
EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
scoped_vector.reset();
EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
}
TEST(ScopedVectorTest, Scope) {
LifeCycleWatcher watcher;
EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
{
ScopedVector<LifeCycleObject> scoped_vector;
scoped_vector.push_back(watcher.NewLifeCycleObject());
EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
}
EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
}
TEST(ScopedVectorTest, MoveConstruct) {
LifeCycleWatcher watcher;
EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
{
ScopedVector<LifeCycleObject> scoped_vector;
scoped_vector.push_back(watcher.NewLifeCycleObject());
EXPECT_FALSE(scoped_vector.empty());
ScopedVector<LifeCycleObject> scoped_vector_copy(scoped_vector.Pass());
EXPECT_TRUE(scoped_vector.empty());
EXPECT_FALSE(scoped_vector_copy.empty());
EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
}
EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
}
TEST(ScopedVectorTest, MoveAssign) {
LifeCycleWatcher watcher;
EXPECT_EQ(LC_INITIAL, watcher.life_cycle_state());
{
ScopedVector<LifeCycleObject> scoped_vector;
scoped_vector.push_back(watcher.NewLifeCycleObject());
ScopedVector<LifeCycleObject> scoped_vector_assign;
EXPECT_FALSE(scoped_vector.empty());
scoped_vector_assign = scoped_vector.Pass();
EXPECT_TRUE(scoped_vector.empty());
EXPECT_FALSE(scoped_vector_assign.empty());
EXPECT_EQ(LC_CONSTRUCTED, watcher.life_cycle_state());
}
EXPECT_EQ(LC_DESTROYED, watcher.life_cycle_state());
}
class DeleteCounter {
public:
explicit DeleteCounter(int* deletes)
: deletes_(deletes) {
}
~DeleteCounter() {
(*deletes_)++;
}
void VoidMethod0() {}
private:
int* const deletes_;
DISALLOW_COPY_AND_ASSIGN(DeleteCounter);
};
template <typename T>
ScopedVector<T> PassThru(ScopedVector<T> scoper) {
return scoper.Pass();
}
TEST(ScopedVectorTest, Passed) {
int deletes = 0;
ScopedVector<DeleteCounter> deleter_vector;
deleter_vector.push_back(new DeleteCounter(&deletes));
EXPECT_EQ(0, deletes);
base::Callback<ScopedVector<DeleteCounter>(void)> callback =
base::Bind(&PassThru<DeleteCounter>, base::Passed(&deleter_vector));
EXPECT_EQ(0, deletes);
ScopedVector<DeleteCounter> result = callback.Run();
EXPECT_EQ(0, deletes);
result.reset();
EXPECT_EQ(1, deletes);
};
TEST(ScopedVectorTest, InsertRange) {
LifeCycleWatcher watchers[5];
std::vector<LifeCycleObject*> vec;
for(LifeCycleWatcher* it = watchers; it != watchers + arraysize(watchers);
++it) {
EXPECT_EQ(LC_INITIAL, it->life_cycle_state());
vec.push_back(it->NewLifeCycleObject());
EXPECT_EQ(LC_CONSTRUCTED, it->life_cycle_state());
}
// Start scope for ScopedVector.
{
ScopedVector<LifeCycleObject> scoped_vector;
scoped_vector.insert(scoped_vector.end(), vec.begin() + 1, vec.begin() + 3);
for(LifeCycleWatcher* it = watchers; it != watchers + arraysize(watchers);
++it)
EXPECT_EQ(LC_CONSTRUCTED, it->life_cycle_state());
}
for(LifeCycleWatcher* it = watchers; it != watchers + 1; ++it)
EXPECT_EQ(LC_CONSTRUCTED, it->life_cycle_state());
for(LifeCycleWatcher* it = watchers + 1; it != watchers + 3; ++it)
EXPECT_EQ(LC_DESTROYED, it->life_cycle_state());
for(LifeCycleWatcher* it = watchers + 3; it != watchers + arraysize(watchers);
++it)
EXPECT_EQ(LC_CONSTRUCTED, it->life_cycle_state());
}
} // namespace
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