I've run into an issue while attempting to start using Google Mocks - for some reason it can't tell the call I'm specifying in the EXPECT_CALL
macro, even though the types are consistent. I want to know why it doesn't just match the first function, and what I need to do/add to make it match the first function.
The mock class:
class GMockTest : public ITest
{
public:
MOCK_METHOD2(SetParameter,
int(int nParameter, double value));
MOCK_METHOD2(SetParameter,
int(int nParameter, int value));
MOCK_METHOD2(SetParameter,
int(int nParameter, __int64 value));
}
The test code that throws the error:
__int64 nFrom = 0,
nTo = 0;
EXPECT_CALL(mock, SetParameter(2, nFrom))
.Times(1)
.WillOnce(Return(0));
EXPECT_CALL(mock, SetParameter(3, nTo))
.Times(1)
.WillOnce(Return(0));
The compilation error:
test.cpp(1343) : error C2668: GMockTest::gmock_SetParameter' : ambiguous call to overloaded function
testmocks.h(592): could be 'testing::internal::MockSpec<F>
&GMockTest::gmock_SetParameter(const testing::Matcher<T> &,const testing::Matcher<A2> &)
'
with
[
F=int (int,__int64),
T=int,
A2=__int64
]
testmocks.h(590): or 'testing::internal::MockSpec<F>
&GMockTest::gmock_SetParameter(const testing::Matcher<T> &,const testing::Matcher<T> &)'
with
[
F=int (int,int),
T=int
]
testmocks.h(580): or 'testing::internal::MockSpec<F>
&GMockTest::gmock_SetParameter(const testing::Matcher<T> &,const testing::Matcher<FloatT
ype> &)'
with
[
F=int (int,double),
T=int,
FloatType=double
]
while trying to match the argument list '(int, __int64)'
Google mock has trouble telling which overload to use. From the cookbook, try using the Matcher<T>
or TypedEq<T>
matchers to specify the exact type:
struct ITest
{
virtual int SetParameter(int n, double v) = 0;
virtual int SetParameter(int n, int v) = 0;
virtual int SetParameter(int n, __int64 v) = 0;
};
struct MockTest : public ITest
{
MOCK_METHOD2(SetParameter, int(int n, double v));
MOCK_METHOD2(SetParameter, int(int n, int v));
MOCK_METHOD2(SetParameter, int(int n, __int64 v));
};
TEST(Test, Test)
{
MockTest mock;
__int64 nFrom = 0, nTo = 0;
EXPECT_CALL(mock, SetParameter(2, Matcher<__int64>(nFrom)));
EXPECT_CALL(mock, SetParameter(3, Matcher<__int64>(nTo)));
mock.SetParameter(2, nFrom);
mock.SetParameter(3, nTo);
}