Learning Test-Driven Development with Go/

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FizzBuzz: "FizzBuzz" Requirement

FizzBuzz: "FizzBuzz" Requirement

Finish the kata by building the FizzBuzz feature.

We'll cover the following...

The last feature that we have to implement is the FizzBuzz feature. Let’s recap the scenarios we’ve managed so far

  • Return Fizz if the number is divisible by 3.
  • Return Buzz if the number is divisible by 5.
  • Return the string representation of the number if not divisible neither by 3 nor by 5.

Now, let’s focus on what we missed to complete the kata.

FizzBuzz scenario

We have to manage the numbers that are divisible by 3 and also by 5. When we receive one of these numbers, we need to return the FizzBuzz string to the caller.

The Red phase

Let’s write one test to jump into the Red phase:

package fizzbuzz

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestFizzBuzz(t *testing.T) {
	// arrange
	testSuite := []struct {
		name     string
		input    int
		expected string
	}{
		{
			"ShouldReturnOne_WhenOneIsPassed",
			1,
			"1",
		},
		{
			"ShouldReturnTwo_WhenTwoIsPassed",
			2,
			"2",
		},
		{
			"ShouldReturnFour_WhenFourIsPassed",
			4,
			"4",
		},
		{
			"ShouldReturnFizz_WhenThreeIsPassed",
			3,
			"Fizz",
		},
		{
			"ShouldReturnFizz_WhenSixIsPassed",
			6,
			"Fizz",
		},
		{
			"ShouldReturnBuzz_WhenFiveIsPassed",
			5,
			"Buzz",
		},
		{
			"ShouldReturnFizzBuzz_WhenFifteenIsPassed",
			15,
			"FizzBuzz",
		},
	}

	for _, tt := range testSuite {
		t.Run(tt.name, func(t *testing.T) {
			// act
			got := FizzBuzz(tt.input)

			// assert
			assert.Equal(t, tt.expected, got)
		})
	}
}
Red phase for the value 15
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