aoc-2024/cmd/day_4/main_test.go

package main

import (
	"testing"
)

func TestCounter(t *testing.T) {
	cases := []struct {
		Name     string
		Expected int
		Input    string
	}{
		{"No hits", 0, "XXXAAMSMMA"},
		{"One hit", 1, "XXMSAXMASA"},
		{"Two hits", 2, "SAMXMMXMAS"},
	}
	ctr := new(Counter)
	buf := make([]byte, 0, 4)

	for _, c := range cases {
		ctr.cnt = 0
		ctr.Init(buf)
		ctr.Reset()

		for _, e := range c.Input {
			ctr.Event(byte(e))
		}
		actual := ctr.Count()
		if actual != c.Expected {
			t.Errorf("%s: Expected %d hits; got %d", c.Name, c.Expected, actual)
		}
	}
}