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使用MS Test的函数TestMockedTRHUStart(void)中引用的未解析外部符号xxx



我有一个真正的exe应用程序，它基本上是trhu类。我创建了一个测试线束类mocktrhu，它继承了trhu并覆盖了trhu中的一些函数。

这两个项目是Visual Studio 2012 C++（非托管/本机）解决方案的一部分。

解决方案中的两个exe项目都可以顺利生成。

然后，我创建了一个VC++测试、本机单元测试项目，其中包括实际应用程序和模拟应用程序的测试。奇怪的是，实际应用程序的测试构建良好，但对于模拟应用程序，我得到了一个未解决的引用错误LNK2019。

1>------ Build started: Project: TRHUUnitTests, Configuration: Debug Win32 ------
1>  TRHUUnitTests.cpp
1>     Creating library MyAppUnderTest_SODebugTRHUUnitTests.lib and object MyAppUnderTest_SODebugTRHUUnitTests.exp
1>TRHUUnitTests.obj : error LNK2019: unresolved external symbol "public: __thiscall mocktrhu::mocktrhu(class config const &)" (??0mocktrhu@@QAE@ABVconfig@@@Z) referenced in function "public: void __thiscall TRHUUnitTests::UnitTests::TestMockedTRHUStart(void)" (?TestMockedTRHUStart@UnitTests@TRHUUnitTests@@QAEXXZ)
1>TRHUUnitTests.obj : error LNK2019: unresolved external symbol "public: virtual bool __thiscall mocktrhu::start(void)" (?start@mocktrhu@@UAE_NXZ) referenced in function "public: void __thiscall TRHUUnitTests::UnitTests::TestMockedTRHUStart(void)" (?TestMockedTRHUStart@UnitTests@TRHUUnitTests@@QAEXXZ)
1>MyAppUnderTest_SODebugTRHUUnitTests.dll : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 2 up-to-date, 0 skipped ==========

问题单元测试是：

TEST_METHOD(TestMockedTRHUStart)
{
    // test mocked TRHU startup
    const int comport(3);
    config conf(comport);
    mocktrhu trhu1(conf);
    trhu1.start();
}

这是代码：

单元测试代码，TRHUUnitTests.cpp:-

#include "CppUnitTest.h"
#include "application.hpp"
#include "MyAppTestHarness.hpp"
using namespace Microsoft::VisualStudio::CppUnitTestFramework;
namespace TRHUUnitTests
{       
    TEST_CLASS(UnitTests)
    {
    public:
        TEST_METHOD(TestMockedTRHUStart)
        {
            // test mocked TRHU startup
            const int comport(3);
            config conf(comport);
            mocktrhu trhu1(conf);
            trhu1.start();
        }
        TEST_METHOD(TestRealTRHUStart)
        {
            // test mocked TRHU startup - NOTE: requires connection to real hardware
            const int comport(3);
            config conf(comport);
            trhu trhu1(conf);
            trhu1.start();
        }
    };
}

真正的应用程序代码（单元测试适用于application.hpp）：

#ifndef APPLICATION_HPP_
#define APPLICATION_HPP_
#include <iostream>
class config
{
public:
    config(int comport) : comport_(comport) {}
    int getport() const { return comport_; }
private:
    int comport_;
};
class trhu
{
public:
    trhu(const config& configuration) : config_(configuration) {}
    virtual bool start()
    {
        // open com port - real hardware stuff
        std::cout << "tchu program opening com port " << config_.getport() << 'n';
        return true;
    }
protected:
    config config_;
};
#endif // APPLICATION_HPP_

实际应用程序代码实现（application.cpp）：

#include "application.hpp"
int main() {
    const int comport(3);
    config conf(comport);
    trhu trhu1(conf);
    trhu1.start();
}

模拟应用程序（单元测试链接器错误-MyAppTestHarness.hpp）：

#ifndef MYAPPTESTHARNESS_HPP_
#define MYAPPTESTHARNESS_HPP_
#include "application.hpp"
class mocktrhu : public trhu
{
public:
    mocktrhu(const config& configuration);
    virtual bool start();
};
#endif // MYAPPTESTHARNESS_HPP_

模拟应用程序代码实现（MyAppTestHarness.cpp）：

#include "MyAppTestHarness.hpp"
#include <iostream>
mocktrhu::mocktrhu(const config& configuration)
    : trhu(configuration) {}
bool mocktrhu::start()
{
    // open com port - real hardware stuff
    std::cout << "mocked tchu program opening com port: " << config_.getport()      'n';
    return true;
}
int main() {
    const int comport(3);
    config conf(comport);
    mocktrhu trhu1(conf);
    trhu1.start();
}

完整性项目和解决方案文件：

顺便说一下，我只配置了调试项目，所以只看调试项目。

解决方案：

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2012
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "MyAppUnderTest", "MyAppUnderTestMyAppUnderTest.vcxproj", "{F8EE9D1D-AA29-4B38-A579-7449C658EB7C}"
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "MyAppTestHarness", "MyAppTestHarnessMyAppTestHarness.vcxproj", "{9052E9B6-FE19-4C76-B7E6-0BE44D0914AD}"
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "TRHUUnitTests", "TRHUUnitTestsTRHUUnitTests.vcxproj", "{D745B2BA-930F-43ED-A9DC-04FABE031F01}"
EndProject
Global
    GlobalSection(SolutionConfigurationPlatforms) = preSolution
        Debug|Win32 = Debug|Win32
        Release|Win32 = Release|Win32
    EndGlobalSection
    GlobalSection(ProjectConfigurationPlatforms) = postSolution
        {F8EE9D1D-AA29-4B38-A579-7449C658EB7C}.Debug|Win32.ActiveCfg = Debug|Win32
        {F8EE9D1D-AA29-4B38-A579-7449C658EB7C}.Debug|Win32.Build.0 = Debug|Win32
        {9052E9B6-FE19-4C76-B7E6-0BE44D0914AD}.Debug|Win32.ActiveCfg = Debug|Win32
        {9052E9B6-FE19-4C76-B7E6-0BE44D0914AD}.Debug|Win32.Build.0 = Debug|Win32
        {D745B2BA-930F-43ED-A9DC-04FABE031F01}.Debug|Win32.ActiveCfg = Debug|Win32
        {D745B2BA-930F-43ED-A9DC-04FABE031F01}.Debug|Win32.Build.0 = Debug|Win32
    EndGlobalSection
    GlobalSection(SolutionProperties) = preSolution
        HideSolutionNode = FALSE
    EndGlobalSection
EndGlobal

单元测试项目文件：

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup Label="ProjectConfigurations">
    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|Win32">
      <Configuration>Release</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <ProjectGuid>{D745B2BA-930F-43ED-A9DC-04FABE031F01}</ProjectGuid>
    <Keyword>Win32Proj</Keyword>
    <RootNamespace>TRHUUnitTests</RootNamespace>
    <ProjectName>TRHUUnitTests</ProjectName>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>DynamicLibrary</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v110</PlatformToolset>
    <CharacterSet>MultiByte</CharacterSet>
    <UseOfMfc>false</UseOfMfc>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>DynamicLibrary</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <PlatformToolset>v110</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>Unicode</CharacterSet>
    <UseOfMfc>false</UseOfMfc>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <PrecompiledHeader>NotUsing</PrecompiledHeader>
      <WarningLevel>Level3</WarningLevel>
      <Optimization>Disabled</Optimization>
      <AdditionalIncludeDirectories>$(VCInstallDir)UnitTestinclude;../MyAppUnderTest;../MyAppTestHarness;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <UseFullPaths>true</UseFullPaths>
      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <AdditionalLibraryDirectories>$(VCInstallDir)UnitTestlib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <PrecompiledHeader>Use</PrecompiledHeader>
      <Optimization>MaxSpeed</Optimization>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <AdditionalIncludeDirectories>$(VCInstallDir)UnitTestinclude;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <UseFullPaths>true</UseFullPaths>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
      <AdditionalLibraryDirectories>$(VCInstallDir)UnitTestlib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
    </Link>
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="TRHUUnitTests.cpp" />
  </ItemGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>

主应用程序项目文件：

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup Label="ProjectConfigurations">
    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|Win32">
      <Configuration>Release</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <ProjectGuid>{F8EE9D1D-AA29-4B38-A579-7449C658EB7C}</ProjectGuid>
    <Keyword>Win32Proj</Keyword>
    <RootNamespace>MyAppUnderTest</RootNamespace>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v110</PlatformToolset>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <PlatformToolset>v110</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>NotSet</CharacterSet>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <LinkIncremental>false</LinkIncremental>
  </PropertyGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <PrecompiledHeader>
      </PrecompiledHeader>
      <WarningLevel>Level3</WarningLevel>
      <Optimization>Disabled</Optimization>
      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <PrecompiledHeader>
      </PrecompiledHeader>
      <Optimization>MaxSpeed</Optimization>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
    </Link>
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="application.cpp" />
  </ItemGroup>
  <ItemGroup>
    <ClInclude Include="application.hpp" />
  </ItemGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>

测试线束项目文件：

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup Label="ProjectConfigurations">
    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|Win32">
      <Configuration>Release</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <ProjectGuid>{9052E9B6-FE19-4C76-B7E6-0BE44D0914AD}</ProjectGuid>
    <Keyword>Win32Proj</Keyword>
    <RootNamespace>MyAppTestHarness</RootNamespace>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v110</PlatformToolset>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <PlatformToolset>v110</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>NotSet</CharacterSet>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <LinkIncremental>false</LinkIncremental>
  </PropertyGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <PrecompiledHeader>
      </PrecompiledHeader>
      <WarningLevel>Level3</WarningLevel>
      <Optimization>Disabled</Optimization>
      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
      <AdditionalIncludeDirectories>../MyAppUnderTest</AdditionalIncludeDirectories>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <PrecompiledHeader>
      </PrecompiledHeader>
      <Optimization>MaxSpeed</Optimization>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
    </Link>
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="MyAppTestHarness.cpp" />
  </ItemGroup>
  <ItemGroup>
    <ClInclude Include="MyAppTestHarness.hpp" />
  </ItemGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>

我该怎么解决这个问题？

更新：

我注意到，我把有效的代码trhu类的实现放在了头文件中。如果我对测试线束模拟代码也这样做，那么它就可以链接了

#ifndef MYAPPTESTHARNESS_HPP_
#define MYAPPTESTHARNESS_HPP_
#include "application.hpp"
class mocktrhu : public trhu
{
public:
    mocktrhu(const config& configuration)
    : trhu(configuration) {}
    virtual bool start()
    {
        // open com port - real hardware stuff
        std::cout << "mocked tchu program opening com port: " << config_.getport() << 'n';
        return true;
    }
};
#endif // MYAPPTESTHARNESS_HPP_

但这当然不是我想要的。我想在实际代码中将头和实现分开。

是因为应用程序是exe而不是libs吗？任何想法都将不胜感激。

更新2:

可能为了让它发挥作用，我需要把mock放在单元测试项目中？

更新3:

我现在在想，要使用单元测试项目，我需要从实现真正的应用程序和mock作为ex，改为实现为库，这样我就可以在单元测试项目中使用libs。来自使用MS单元测试框架的人员的任何反馈。你是做什么的？

我在您的代码中找不到mocktrhu::mocktrhu(class config const &)的实现（仅声明）。它在哪里实施？

MyAppTestHarness.cpp中没有方法体定义。此外，您可能需要导出您的类才能在其他项目中使用它。

为了能够从MS Test框架中调用函数，您需要能够将MS Test项目与函数的对象代码（或对象或其他）链接起来。在上面的例子中，"真正的"应用程序代码实现都在头文件中，所以不会造成问题。在模拟的应用程序代码中，实现代码不在头文件中，因此在这种情况下，MS测试项目不可用。因此出现了链接器错误。

问题是，在对象代码中无法链接的地方，无法测试代码。真实项目和模拟项目都是可执行类型的。您可以尝试链接从构建生成的中间对象文件，但这可能不是一个干净的解决方案。

我对设计做了一点改动，解决了这个问题。我将真实代码和模拟代码放入库中。因此，真正的应用程序仍然是一个exe项目，但它使用了一个实现程序逻辑的库。因此单元测试项目可以与这个库链接。模拟项目也是如此——它被改成了一个库。

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