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// Copyright (c) 2011 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/callback.h"
#include "base/callback_internal.h"
#include "base/memory/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
class HelperObject {
public:
HelperObject() : next_number_(0) { }
int GetNextNumber() { return ++next_number_; }
void GetNextNumberArg(int* number) { *number = GetNextNumber(); }
private:
int next_number_;
};
struct FakeInvoker {
static void DoInvoke(internal::InvokerStorageBase*) {
}
};
// White-box testpoints to inject into a Callback<> object for checking
// comparators and emptiness APIs.
class FakeInvokerStorage1 : public internal::InvokerStorageBase {
public:
typedef FakeInvoker Invoker;
};
class FakeInvokerStorage2 : public internal::InvokerStorageBase {
public:
typedef FakeInvoker Invoker;
};
TEST(CallbackOld, OneArg) {
HelperObject obj;
scoped_ptr<Callback1<int*>::Type> callback(
NewCallback(&obj, &HelperObject::GetNextNumberArg));
int number = 0;
callback->Run(&number);
EXPECT_EQ(number, 1);
}
TEST(CallbackOld, ReturnValue) {
HelperObject obj;
scoped_ptr<CallbackWithReturnValue<int>::Type> callback(
NewCallbackWithReturnValue(&obj, &HelperObject::GetNextNumber));
EXPECT_EQ(callback->Run(), 1);
}
class CallbackTest : public ::testing::Test {
public:
CallbackTest()
: callback_a_(MakeInvokerStorageHolder(new FakeInvokerStorage1())),
callback_b_(MakeInvokerStorageHolder(new FakeInvokerStorage2())) {
}
virtual ~CallbackTest() {
}
protected:
Callback<void(void)> callback_a_;
const Callback<void(void)> callback_b_; // Ensure APIs work with const.
Callback<void(void)> null_callback_;
};
// Ensure we can create unbound callbacks. We need this to be able to store
// them in class members that can be initialized later.
TEST_F(CallbackTest, DefaultConstruction) {
Callback<void(void)> c0;
Callback<void(int)> c1;
Callback<void(int,int)> c2;
Callback<void(int,int,int)> c3;
Callback<void(int,int,int,int)> c4;
Callback<void(int,int,int,int,int)> c5;
Callback<void(int,int,int,int,int,int)> c6;
EXPECT_TRUE(c0.is_null());
EXPECT_TRUE(c1.is_null());
EXPECT_TRUE(c2.is_null());
EXPECT_TRUE(c3.is_null());
EXPECT_TRUE(c4.is_null());
EXPECT_TRUE(c5.is_null());
EXPECT_TRUE(c6.is_null());
}
TEST_F(CallbackTest, IsNull) {
EXPECT_TRUE(null_callback_.is_null());
EXPECT_FALSE(callback_a_.is_null());
EXPECT_FALSE(callback_b_.is_null());
}
TEST_F(CallbackTest, Equals) {
EXPECT_TRUE(callback_a_.Equals(callback_a_));
EXPECT_FALSE(callback_a_.Equals(callback_b_));
EXPECT_FALSE(callback_b_.Equals(callback_a_));
// We should compare based on instance, not type.
Callback<void(void)> callback_c(
MakeInvokerStorageHolder(new FakeInvokerStorage1()));
Callback<void(void)> callback_a2 = callback_a_;
EXPECT_TRUE(callback_a_.Equals(callback_a2));
EXPECT_FALSE(callback_a_.Equals(callback_c));
// Empty, however, is always equal to empty.
Callback<void(void)> empty2;
EXPECT_TRUE(null_callback_.Equals(empty2));
}
TEST_F(CallbackTest, Reset) {
// Resetting should bring us back to empty.
ASSERT_FALSE(callback_a_.is_null());
ASSERT_FALSE(callback_a_.Equals(null_callback_));
callback_a_.Reset();
EXPECT_TRUE(callback_a_.is_null());
EXPECT_TRUE(callback_a_.Equals(null_callback_));
}
} // namespace
} // namespace base
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