Capture GMOCK string parameter

Question

If I have the following interface member function:

virtual bool print_string(const char* data) = 0;

with the following mock

MOCK_METHOD1(print_string, bool(const char * data));

Is it possible to capture the string that is passed to print_string()?

I tried to:

char out_string[20];     //
SaveArg<0>(out_string);  // this saves the first char of the sting

this saves the first char of the sting but not the whole string.

Answer 1

Class

struct Foo {
    virtual bool print_string(const char* data) = 0;
};

Mock

struct FooMock {
    MOCK_METHOD1(print_string, bool(const char * data));
};

Test

struct StrArg {
    bool print_string(const char* data) { 
        arg = data; 
        return true; 
    }
    string arg;
};

TEST(FooTest, first) {
    FooMock f;
    StrArg out_string;

    EXPECT_CALL(f, print_string(_))
        .WillOnce(Invoke(&out_string, &StrArg::print_string));
    f.print_string("foo");
    EXPECT_EQ(string("foo"), out_string.arg);
}

You can always use Invoke to capture parameter value in structure.