GTEST - ASSERT_EQ和EXPECT_EQ编译错误

Question

我一直在尝试使用ASSERT_EQ和EXPECT_EQ的断言，

ASSERT_EQ（队列_-＆GT;尺寸（），6）;

即使使用此

ASSERT_EQ（6,6）;

然而，我遇到了这个编译器错误，我搜索到的任何地方似乎都没有人面对 这个问题。

/tmp/cczZfMaq.o：在函数testing::AssertionResult testing::internal::EqHelper<false>::Compare<char, char>(char const*, char const*, char const&, char const&)': /usr/include/gtest/gtest.h:1485: undefined reference to中测试:: AssertionResult testing :: internal :: CmpHelperEQ（char const *，char const *，char const＆amp;，char const＆amp;）＆＃39; collect2：错误：ld返回1退出状态 make： * [priority_queue_test.out]错误1

完整测试文件：

     //Include the class which you would like to test
        #include "priority_queue.h"

        //Include the google c++ test framework
        #include 

        #include 
        #include  

        //use the namespace for the testing class 
        using namespace algorithms;
        using namespace containers;

        namespace{
        //Test Fixture Class
        //multple tests in a test case shared common objects and subroutines
        class PriorityQueueTest : public ::testing::Test{
            protected:

                PriorityQueueTest(){
                }

                virtual ~PriorityQueueTest(){

                }

                virtual void SetUp(){
                    queue_ = new PriorityQueue(1000);
                }

                virtual void TearDown(){

                }

                PriorityQueue *queue_=NULL;
        };

        TEST_F(PriorityQueueTest,CheckAllMemberInitSuccessfully){

            //ASSERT is a critcal assertion which will fail the test program
            ASSERT_TRUE(queue_!=NULL) capacity()==1000) capacity();
        }

        TEST_F(PriorityQueueTest,CheckIfItemsAreEnqueueCorrectly){

            //test cases    
            queue_->Enqueue(0,0);
            queue_->Enqueue(1,1);
            queue_->Enqueue(6,6);
            queue_->Enqueue(5,5);
            queue_->Enqueue(3,3);
            queue_->Enqueue(2,2);

            ASSERT_EQ('a','a');
        }

        }//namespace

        int main(int argc, char *argv[]){
            ::testing::InitGoogleTest(&argc,argv);

            return RUN_ALL_TESTS();
        }