How to use google test for C++ to run through combinations of data

Question

I have a unit test that I need to run for 200 possible combinations of data. (The production implementation has the data to be tested in configuration files. I know how to mock

Answer 1

Use an array of structs (called, say, Combination) to hold your test data, and loop though each entry in a single test. Check each combination using EXPECT_EQ instead of ASSERT_EQ so that the test isn't aborted and you can continue checking other combinations.

Overload operator<< for a Combination so that you can output it to an ostream:

ostream& operator<<(ostream& os, const Combination& combo)
{
    os << "(" << combo.field1 << ", " << combo.field2 << ")";
    return os;
}

Overload operator== for a Combination so that you can easily compare two combinations for equality:

bool operator==(const Combination& c1, const Combination& c2)
{
    return (c1.field1 == c2.field1) && (c1.field2 == c2.field2);
}

And the unit test could look something like this:

TEST(myTestCase, myTestName)
{
    int failureCount = 0;
    for (each index i in expectedComboTable)
    {
        Combination expected = expectedComboTable[i];
        Combination actual = generateCombination(i);
        EXPECT_EQ(expected, actual);
        failureCount += (expected == actual) ? 0 : 1;
    }
    ASSERT_EQ(0, failureCount) << "some combinations failed";
}