使用Gmock在EXPECT_CALL之前使用ON_CALL时的奇怪行为

时间:2013-05-22 21:46:34

标签: c++ unit-testing gmock

在跟踪带有EXPECT_CALL语句的ON_CALL语句时,有没有人见过在gmock中看到奇怪的行为?对我来说,以下代码中的EXPECT_CALL语句不起作用(它实际上并不强制执行Times部分):

ON_CALL(myMockObject, myMockMethod()).WillByDefault(Return("hello mock")));
EXPECT_CALL(myMockObject, myMockMethod()).Times(99999);
myMockObject.myMockMethod();

我尝试过的其他解决方案:

从超类中重写myMockMethod并让它只返回一个字符串文字。这个问题是我无法确定以后调用它的次数。

跳过ON_CALL部分以支持这样的事情:

EXPECT_CALL(myMockObject, myMockMethod())
    .Times(1)
    .WillRepeatedly(Return("hello mock"));

这会导致编译错误。

另外值得注意的是,我在这个例子中使用的字符串文字在现实中是自定义的,而gmock将无法提供默认值(例如bool)。

2 个答案:

答案 0 :(得分:2)

您的原始代码中还有其他错误,而您的问题中没有提到。如果您构建一个最小的自包含示例,问题中提供的代码就会按预期运行。

例如,以下代码:

#include <string>
#include "gmock/gmock.h"

using ::testing::Return;

struct MyClass {
  virtual ~MyClass() {}
  virtual std::string myMockMethod() = 0;
};

struct MyMockClass : MyClass {
  MOCK_METHOD0(myMockMethod, std::string());
};

TEST(MyClass, Fails) {
  MyMockClass myMockObject;
  ON_CALL(myMockObject, myMockMethod()).WillByDefault(Return("hello mock"));
  EXPECT_CALL(myMockObject, myMockMethod()).Times(99999);
  myMockObject.myMockMethod();
}

TEST(MyClass, Passes) {
  MyMockClass myMockObject;
  EXPECT_CALL(myMockObject, myMockMethod()).Times(1).WillRepeatedly(Return("hello mock"));
  myMockObject.myMockMethod();
}

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

产生以下(预期)输出:

[==========] Running 2 tests from 1 test case.
[----------] Global test environment set-up.
[==========] 2 tests from MyClass
[ RUN      ] MyClass.Fails
..\src\main.cc(18): error: Actual function call count doesn't match EXPECT_CALL(myMockObject, myMockMethod())...
         Expected: to be called 99999 times
           Actual: called once - unsatisfied and active
[  FAILED  ] MyClass.Fails (0 ms)
[ RUN      ] MyClass.Passes
[       OK ] MyClass.Passes (0 ms)
[----------] 2 tests from MyClass (2 ms total)

[----------] Global test environment tear-down
[==========] 2 tests from 1 test case ran. (2 ms total)
[  PASSED  ] 1 test.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] MyClass.Fails

 1 FAILED TEST

如果您希望将模拟对象保存在测试夹具中,您可以执行以下操作:

class MyClassTest : public testing::Test {
 protected:
  MyMockClass myMockObject_;
};

TEST_F(MyClassTest, Fails) {
  ON_CALL(myMockObject_, myMockMethod()).WillByDefault(Return("hello mock"));
  EXPECT_CALL(myMockObject_, myMockMethod()).Times(99999);
  myMockObject_.myMockMethod();
}

答案 1 :(得分:0)

 Mock::VerifyAndClearExpectations(&myMockObject);

这就是诀窍。我仍然不确定在幕后如何管理期望,但这让我工作。

但是,对此的任何进一步解释都将非常感激。