Modern C++ Programming with Test-Driven Development

A2.2 Let’s Go!

What are we building?

Story: Roman Numeral Converter

We need a function that takes an Arabic number and returns its Roman numeral equivalent (as a string).

One, Two, Three, ...

Getting the first test to pass will take us a few minutes, since there’s a good amount of setup work to do (getting the build script in place, adding header includes, and so on). There are also decisions to be made: What are we going to name our test method? What should the interface to our function look like?

We choose to make our conversion a free function. Here’s the first, failing test:

TEST(RomanConverter, CanConvertPositiveDigits) {
   EXPECT_THAT(convert(1), Eq("I"));
}

One of the goals for a kata is to minimize our ...