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c++ - googletest：如何从内部方法中跳过测试

问题描述

有了GTEST_SKIP，我们可以（有条件地）跳过一个测试。它的实现方式如下：

#define GTEST_SKIP_(message) \
  return GTEST_MESSAGE_(message, ::testing::TestPartResult::kSkip)

如果我们在主测试体中，一切都很好。

如何从我的代码库深处跳过测试？这不起作用：

int skip_this(int x) {
  if (x == 3) GTEST_SKIP();
  return x;
}

TEST(X, Y) {
  skip_this(2);
  skip_this(3);
  throw std::runtime_error("Did not skip");
}

错误：

/Users/markus/Projekte/Opossum/Git/src/test/operators/aggregate_test.cpp:183:15: error: cannot initialize return object of type 'int' with an rvalue of type 'void'
  if (x == 3) GTEST_SKIP();
              ^~~~~~~~~~~~

换句话说：如何修改skip_this以使测试通过或标记为“已跳过”？

标签： c++testinggoogletest

解决方案

这不是很好，但适用于我的目的。这个想法是展开堆栈，搜索调用测试的 googletest 方法并将指令指针重置为该堆栈帧。

请注意，堆栈未正确销毁，这意味着例如资源可能会泄漏。

#define UNW_LOCAL_ONLY
#include <libunwind.h>
#include <cxxabi.h>
#include <iostream>

#include <gtest/gtest.h>

void skip() {
  unw_cursor_t cursor;
  unw_context_t context;

  unw_getcontext(&context);
  unw_init_local(&cursor, &context);

  while (unw_step(&cursor)) {
    unw_word_t off;

    char symbol[256] = {"<unknown>"};
    char* name = symbol;

    if (!unw_get_proc_name(&cursor, symbol, sizeof(symbol), &off)) {
      int status;
      if ((name = abi::__cxa_demangle(symbol, nullptr, nullptr, &status)) == nullptr) name = symbol;
    }

    if (std::string(name) == "testing::Test::Run()") {
      ::testing::internal::AssertHelper(::testing::TestPartResult::kSkip, __FILE__, __LINE__, "skipped") = ::testing::Message();
      unw_resume(&cursor);
    }

    if (name != symbol) free(name);
  }

  throw std::runtime_error("Did not find test method on the stack, could not skip test");
}

示例测试（可以粘贴在上面的代码下方）：

int foo(int x) {
  if (x == 3) skip();
  return 11;
}

TEST(SkipTest, ShouldNotBeSkipped) {
  foo(2);
  EXPECT_TRUE(false);
}

TEST(SkipTest, ShouldBeSkipped) {
  foo(3);
  EXPECT_TRUE(false);
}

TEST(SkipTest, TestExecutionContinues) {
  EXPECT_FALSE(false);
}

int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}

输出：

[==========] Running 3 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 3 tests from SkipTest
[ RUN      ] SkipTest.ShouldNotBeSkipped
skip_test.cpp:44: Failure
Value of: false
  Actual: false
Expected: true
[  FAILED  ] SkipTest.ShouldNotBeSkipped (0 ms)
[ RUN      ] SkipTest.ShouldBeSkipped
[  SKIPPED ] SkipTest.ShouldBeSkipped (0 ms)
[ RUN      ] SkipTest.TestExecutionContinues
[       OK ] SkipTest.TestExecutionContinues (0 ms)
[----------] 3 tests from SkipTest (0 ms total)

[----------] Global test environment tear-down
[==========] 3 tests from 1 test case ran. (0 ms total)
[  PASSED  ] 1 test.
[  SKIPPED ] 1 test, listed below:
[  SKIPPED ] SkipTest.ShouldBeSkipped
[  FAILED  ] 1 test, listed below:
[  FAILED  ] SkipTest.ShouldNotBeSkipped

 1 FAILED TEST

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