Roman Numerals: First Test

Practice

Now that we’ve covered the basics of tests in Go, let’s see a practical example in which we’re going to add tests and refactor them. The exercise we’ll rely on is the Roman Numerals Converter kata.

Roman numeral conversion

This is by far one of the most popular katas available. However, let’s refresh its rules for the purposes of this lesson. The Roman symbols that we can use to represent numbers are summarized in the following table:

Other rules are:

• We can’t have more than three equal adjacent symbols, which means that 4 is represented with IV instead of IIII.
• Valid numbers that can be converted are only within the 1 to 3999 range (extremes included).

The following table has some conversion examples to help clarify the concept:

Implementation

The goal of this exercise is to write a function ...