Problem using ElementsAreArray with C-Style array

[Ken]

Hi.  I am trying to use googlemock to test a parameter that is a c-style array.  I have looked at the CookBook and several posts on this group.  I've tried to base what I have done on those examples, but I keep getting the same compile error.

 

 

Here is a code snippet:

 

double doubleArray[] = {1.1, 2.2};

 

Matcher<double> expected_array_values[] =

{

   DoubleEq(1.1),

   DoubleEq(2.2)

};

 

EXPECT_CALL(mock_arrayUser, doubleArrayIn(ElementsAreArray(expected_array_values)));

The signature of doubleArrayIn is

void doubleArrayIn(double array[ ]) = 0;

 

The error I am getting says that in gmock-matchers.h, line 2873, error "double*" is not a class, struct or union type.  The error gets kicked off from line 3292 which is trying to instantiate ElementsAreArrayMatcher<T> as operator testing::Matcher<T>() const [with Container = double*, T = testing::Matcher<double>]

 

Any suggestions?

 

I am using GoogleMock 1.7.

 

Thanks!

 

Ken

[Samuel Benzaquen]

ElementsAre can't work with unsized arrays. It can't know its size, so it can't iterate it and compare them. It does work on sized arrays (like 'double array[N]').

Note that the 'Array' part of ElementsAreArray refers to the way you construct the matcher, not what it matches. It is still a variant of ElementAre.

I recommend using a custom matcher for that.

Something like:

MATCHER_P(AsVector, m, DescribeMatcher(m, negation)) {

  return ExplainMatchResult(m, std::vector<double>(arg, <some_hardcoded_size_you_know>), result_listener);

}

...

EXPECT_CALL(mock_arrayUser, doubleArrayIn(AsVector(ElementsAreArray(expected_array_values))));

The custom matcher is pretty much only providing that hardcoded size to the array. If there is not such a size, then I don't think you can do this safely.

_Sam

 

I am using GoogleMock 1.7.

 

Thanks!

 

Ken

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[Greg]

There is another way to do it, but it also requires to pass the array size:

class Mock

{

  public:

    MOCK_METHOD4(func, void(int, const std::string&, int *array, int arraySize));

}

TEST(MockTest, Array)

{

    Mock mock;

    EXPECT_CALL(mock, func(1, "test", _, _))

        .With(Args<2, 3>(ElementsAre(1, 2, 3)));