test case neither passes nor fails in vs

In VS Express 2013, I run the following program against certain test cases written in a spec file. The code and a portion of the spec file is as follows:

struct DOB {
    int date;
    int month;
    int year;
};

int stringToValue(char* temp) {
    int num = 0;
    while (*temp != '-' && *temp != '\0') {
        if (((*temp) >= '0') && ((*temp) <= '9')) {
            num = num * 10 + ((*temp) - '0');
            ++temp;
        }
    }
    return num;
}

int isValidFormat(char* dob) {
    int length = 0;
    for (int i = 0; dob[i] != '\0'; ++i) {
        if (!((dob[i] >= '0' && dob[i] <= '9' || dob[i] == '-')))
            return 0;
        ++length;
    }
    return length;
}

int function(int value1, int value2) {
    if (value1>value2) {
        return 2;
    }

    else if (value1<value2) {
        return 1;
    }
    else
        return 0;
}

int isLeap(int year) {
    if ((year % 4 == 0) && !(year % 100)) {
        return 1;
    }

    else {
        if (year % 400 == 0)
            return 1;
        else
            return 0;
    }
}

int isValid(struct DOB d) {
    if (d.year>0) {
        if (d.month>0 && d.month <= 12) {
            if (d.month == 2 && isLeap(d.year) == 1) {
                if (d.date>0 && d.date <= 29) {
                    return 1;
                }
                else if (d.date > 0 && d.date <= 28) {
                    return 1;
                }
                else
                    return 0;
            }
            else if (d.date == 1 || d.date == 3 || d.date == 5 || d.date == 7 || d.date == 8 || d.date == 10 || d.date == 12){
                if (d.date > 0 && d.date <= 31) {
                    return 1;
                }
                else
                    return 0;
            }
            else {
                if (d.date > 0 && d.date <= 30) {
                    return 1;
                }
                else
                    return 0;
            }
        }
        else {
            return 0;
        }
    }
    else {
        return 0;
    }
}

int isOlder(char* dob1, char* dob2) {
    struct DOB d1, d2;

    if (isValidFormat(dob1)!= 10 && isValidFormat(dob2) != 10)
        return -1;

    d1.date = stringToValue(dob1);
    d2.date = stringToValue(dob2);
    d1.month = stringToValue(dob1 + 3);
    d2.month = stringToValue(dob2 + 3);
    d1.year = stringToValue(dob1 + 6);
    d2.year = stringToValue(dob2 + 6);

    if (isValid(d1) == 1 && isValid(d2) == 1) {
        if (function(d1.year, d2.year) != 0)
            return function(d1.year, d2.year);
        else if (function(d1.month, d2.month) != 0)
            return function(d1.month, d2.month);
        else
            return function(d1.date, d2.date);
    }

    else {
        return -1;
    }
}

TEST_METHOD(isOlderinvalid)
        {
            Assert::AreEqual(-1, isOlder("1000", "15-07-2000"), L"isOlder: invalid input case failed", LINE_INFO());
            Assert::AreEqual(-1, isOlder("15-07-2000", "000"), L"isOlder: invalid input case failed", LINE_INFO());
            Assert::AreEqual(-1, isOlder("15-0A-2000", "15-07-2000"), L"isOlder: invalid input case failed", LINE_INFO());
            Assert::AreEqual(-1, isOlder("15-13-2000", "15-07-2000"), L"isOlder: invalid input case failed", LINE_INFO());
            Assert::AreEqual(-1, isOlder("29-02-2001", "15-07-2000"), L"isOlder: invalid input case failed", LINE_INFO());
        }

When I run the following test cases on my local compiler, I get the expected output. But when I run the tests on the above code, I neither pass nor fail the above test cases. I'm honestly not sure what's wrong. It seems like a VS-specific problem rather than a problem with my code. Could someone PLEASE PLEASE help me out?