libutils/StrongPointer_test.cpp

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <gtest/gtest.h>

#include <utils/StrongPointer.h>
#include <utils/RefBase.h>

using namespace android;

class SPFoo : virtual public RefBase {
  public:
    explicit SPFoo(bool* deleted_check) : mDeleted(deleted_check) {
        *mDeleted = false;
    }

    ~SPFoo() {
        *mDeleted = true;
    }
private:
    bool* mDeleted;
};

TEST(StrongPointer, move) {
    bool isDeleted;
    sp<SPFoo> sp1 = sp<SPFoo>::make(&isDeleted);
    SPFoo* foo = sp1.get();
    ASSERT_EQ(1, foo->getStrongCount());
    {
        sp<SPFoo> sp2 = std::move(sp1);
        ASSERT_EQ(1, foo->getStrongCount()) << "std::move failed, incremented refcnt";
        ASSERT_EQ(nullptr, sp1.get()) << "std::move failed, sp1 is still valid";
        // The strong count isn't increasing, let's double check the old object
        // is properly reset and doesn't early delete
        sp1 = std::move(sp2);
    }
    ASSERT_FALSE(isDeleted) << "deleted too early! still has a reference!";
    {
        // Now let's double check it deletes on time
        sp<SPFoo> sp2 = std::move(sp1);
    }
    ASSERT_TRUE(isDeleted) << "foo was leaked!";
}

TEST(StrongPointer, NullptrComparison) {
    sp<SPFoo> foo;
    ASSERT_EQ(foo, nullptr);
    ASSERT_EQ(nullptr, foo);
}

TEST(StrongPointer, PointerComparison) {
    bool isDeleted;
    sp<SPFoo> foo = sp<SPFoo>::make(&isDeleted);
    ASSERT_EQ(foo.get(), foo);
    ASSERT_EQ(foo, foo.get());
    ASSERT_NE(nullptr, foo);
    ASSERT_NE(foo, nullptr);
}

TEST(StrongPointer, AssertStrongRefExists) {
    // uses some other refcounting method, or non at all
    bool isDeleted;
    SPFoo* foo = new SPFoo(&isDeleted);

    // can only get a valid sp<> object when you construct it as an sp<> object
    EXPECT_DEATH(sp<SPFoo>::fromExisting(foo), "");

    delete foo;
}