Unit test against odbc-driver function involving SQLPOINTER

I want to write unit tests against the following functions. But I do not know how to create a non-null SQLPointer. Could someone help to build an example of unit test parameters for the following store_sqlwstr with the expected true/false return value please?

http://ift.tt/1Gi8OYX

bool store_sqlwstr(SQLPOINTER OutPointer, SQLSMALLINT BufferLength,
                   SQLSMALLINT *StringLengthPtr, const char *value) {
    string str = value;
    return store_sqlwstr(OutPointer, BufferLength, StringLengthPtr, str);
}


bool store_sqlwstr(SQLPOINTER OutPointer, SQLSMALLINT BufferLength,
                   SQLSMALLINT *StringLengthPtr, const string &value) {
    assert(OutPointer != NULL);

    sqlwchar_string sqlwstr;
    int in_len, len, out_len;

    // BufferLength is in bytes, not characters.
    in_len = BufferLength / sizeof(SQLWCHAR);

    utf8_to_swchar(value, sqlwstr);
    len = swchar_strlcpy((SQLWCHAR *) OutPointer, sqlwstr.c_str(), in_len);

    // Store the actual number of characters written into the buffer.
    out_len = min(in_len - 1, len);
    if (StringLengthPtr != NULL)
        *StringLengthPtr = out_len * sizeof(SQLWCHAR);

    return (len == out_len);
}

I have a test like:

TEST(outParams, testStoreSQLwstr) {
    string test = "test";
    string *p = &test;
    SQLPOINTER outPointer = p; 
    SQLSMALLINT bufferLength = 100;
    SQLSMALLINT *stringLengthPtr = new SQLSMALLINT(100);
    const char *value = "string"; // 4 byte

    EXPECT_TRUE(store_sqlwstr(outPointer, bufferLength, stringLengthPtr, value));}

But it is throwing errors pointer being freed was not allocated .

Thank you.