单元测试编译时错误 [英] Unit test compile-time error

问题描述

有没有方法来测试编译时错误，但没有实际生成错误？例如，如果我创建一个不可复制的类，我想测试一个事实，试图复制它会生成一个编译器错误，但我仍然想执行其他运行时测试。

Is there a way to test compile-time errors, but without actually generating the error? For example, if I create a class which is non-copyable, I'd like to test the fact that trying to copy it will generate a compiler error, but I'd still like to execute the other runtime tests.

struct Foo {
    int value_;
    Foo(int value) : value_(value) {}
  private:
    Foo(const Foo&);
    const Foo& operator=(const Foo&);
};

int main()
{
    Foo f(12);
    assert(f.value_ == 12);
    assert(IS_COMPILER_ERROR(Foo copy(f);));
} // Would like this to compile and run fine.

我想这不能简单地做，但有一个惯用的方式这个，或者我应该滚动我自己的解决方案（可能使用脚本编译单独的测试文件和测试结果？）

I guess this can't be done as simply as that, but is there an idiomatic way to do this, or should I roll my own solution (maybe using scripts compiling separate tests files and testing the results?)?

注意：我采取不可复制只是为了说明我的点，所以我不感兴趣关于使用boost :: noncopyable等的答案。

N.B.: I took non-copyable only to illustrate my point, so I'm not interested in answers about using boost::noncopyable and such.

推荐答案

。每个测试将是一个代码片段。这里是一个工作示例与VC测试2。 （我使用了2个批处理文件通过测试和失败测试）。我在这里使用GNU make。

You can do it using make. Each test will be a code snippet. Here's a working example with 2 tests for VC++. (I've used 2 batch files for pass test and fail test). I'm using GNU make here.

Makefile：

FAILTEST = .\failtest.bat
PASSTEST = .\passtest.bat

tests: must_fail_but_passes \
    must_pass_but_fails

must_fail_but_passes:
    @$(FAILTEST) $@.cpp

must_pass_but_fails:
    @$(PASSTEST) $@.cpp

must_pass_but_fails.cpp

must_pass_but_fails.cpp

struct Foo {
    int value_;
    Foo(void) : value_(0) {}
  private:
    Foo(const Foo&);
    const Foo& operator=(const Foo&);
};

int main（）
{
Foo f（12）;
return 0;
}

int main() { Foo f(12); return 0; }

must_fail_but_passes.cpp

must_fail_but_passes.cpp

struct Foo {
    int value_;
    Foo(int value) : value_(value) {}
  private:
    Foo(const Foo&);
    const Foo& operator=(const Foo&);
};

int main（）
{
Foo f（12）;
return 0;
}

int main() { Foo f(12); return 0; }

passtest.bat

passtest.bat

@echo off
cl /nologo %1 >NUL
if %errorlevel% == 0 goto pass
@echo %1 FAILED
:pass

failtest.bat

failtest.bat

@echo off
cl /nologo %1 >NUL
if not %errorlevel% == 0 goto pass
@echo %1 FAILED
:pass

请注意，cl.exe（即Visual Studio编译器）

Note that cl.exe (i.e. Visual Studio compiler) need to be in your path for this to "just work"

有乐趣！

PS我怀疑这会让我着名，虽然： - ）

P.S. I doubt that this would make me famous though :-)

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