gtest-测试模板类 [英] gtest - testing template class

问题描述

我想用gtest测试一个模板类.我在 Google测试手册中了解了TYPED_TEST. a>并查看了他们引用的官方示例，但仍然无法解决在测试中实例化模板类对象的问题.

I want to test a template class with gtest. I read about TYPED_TESTs in Google Test manual and looked at official example they reference, but still can't wrap my head around getting an object of template class instantiated in my test.

假设以下简单模板类:

template <typename T>
class Foo
{
public:
    T data ;
};

在测试课中，我们声明

typedef ::testing::Types<int, float> MyTypes ;

现在如何在测试中为MyTypes中列出的Ts实例化Foo类的对象? 例如

Now how can I instantiate an object of class Foo for Ts listed in MyTypes in a test? E.g.

TYPED_TEST(TestFoo, test1)
{
    Foo<T> object ;
    object.data = 1.0 ;

    ASSERT_FLOAT_EQ(object.data, 1.0) ;
}

推荐答案

在测试中，请参考特殊名称TypeParam以获取类型参数.所以你可以做

Inside a test, refer to the special name TypeParam to get the type parameter. So you could do

TYPED_TEST(TestFoo, test1)
{
    Foo<TypeParam> object ; // not Foo<T>
    object.data = 1.0 ;

    ASSERT_FLOAT_EQ(object.data, 1.0) ;
}

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