Question

EXPECT_CALL(*backendHttpResponseStatusLogger, LogValue(0, ElementsAreArray({ "ip1:p1", "pool1", "setting1", "1xx" }))).Times(1);

出现以下编译错误。什么是使用它的正确方法。 LogValue函数的签名为void(int64_t, const string[])

 /appgwtlib/googletest/googletest-release-1.8.0/googlemock/include/gmock/gmock-matchers.h: In instantiation of 'class testing::internal::ElementsAreMatcherImpl<const std::__cxx11::basic_string<char>*>':
    /appgwtlib/googletest/googletest-release-1.8.0/googlemock/include/gmock/gmock-matchers.h:3532:23:   required from 'testing::internal::ElementsAreArrayMatcher<T>::operator testing::Matcher<T>() const [with Container = const std::__cxx11::basic_string<char>*; T = const char*]'
    NginxMetricHandlerTests.cpp:85:3:   required from here
    /appgwtlib/googletest/googletest-release-1.8.0/googlemock/include/gmock/gmock-matchers.h:3114:45: error: 'testing::internal::ElementsAreMatcherImpl<const std::__cxx11::basic_string<char>*>::StlContainer {aka const std::__cxx11::basic_string<char>*}' is not a class, struct, or union type
       typedef typename StlContainer::value_type Element;
                                                 ^
    /appgwtlib/googletest/googletest-release-1.8.0/googlemock/include/gmock/gmock-matchers.h:3248:43: error: 'testing::internal::StlContainerView<const std::__cxx11::basic_string<char>*>::type {aka const std::__cxx11::basic_string<char>*}' is not a class, struct, or union type
       ::std::vector<Matcher<const Element&> > matchers_;

Answer 1

我认为无法使用ElementsAreArray（或任何其他硬币容器匹配器）来做到这一点

如果我正确地阅读了documentation，我不是100％，但是看来C风格的数组必须通过引用传递，或者它的大小才能使匹配器起作用。

请注意此错误：

error: 'testing::internal::ElementsAreMatcherImpl<const std::__cxx11::basic_string<char>*>::StlContainer {aka const std::__cxx11::basic_string<char>*}' is not a class, struct, or union type

GMock内部类的成员称为StlContainer，但它是std::string*。

这是行不通的，除非您传递数组中的元素数量（在处理C样式数组时，无论如何应该这样做）。

相反，您可以编写自己的匹配器，比较元素是不安全的（不知道数组的实际大小）：

MATCHER_P(CStyleArrayEqual, arrayToCompare, "")
{
    int i = 0;
    for(const auto& elem: arrayToCompare)
    {
        //very, VERY unsafe! You don't know the length of arg!
        //std::initializer_list doesn't have operator[], have to resort to other methods
        if(arg[i] != elem)
            return false;
        ++i;
    }
    return true;
}

但是，这需要传递一个有效的对象（ braised-init-lists 不适用于模板）：

EXPECT_CALL(*backendHttpResponseStatusLogger, LogValue(0, CStyleArrayEqual(std::vector<std::string>{"1", "2"})));

为避免明确命名类型，您可以预先声明变量：

auto arrayToMatch {"1", "2"}; //type is std::initializer_list<std::string>
EXPECT_CALL(*backendHttpResponseStatusLogger, LogValue(0, CStyleArrayEqual(arrayToMatch)));

See it online

如何在EXPECT_CALL中使用ElementsAreArray匹配器

1 个答案: