package domain

import "testing"

func TestIntersperse(t *testing.T) {
	got := Intersperse([]int64{1, 2, 3}, 0)
	want := []int64{0, 1, 0, 2, 0, 3, 0}
	if len(got) != len(want) {
		t.Fatalf("Intersperse() = %v, want %v", got, want)
	}
	for i := range want {
		if got[i] != want[i] {
			t.Fatalf("Intersperse() = %v, want %v", got, want)
		}
	}
}

func TestSymbolToIDCoversLetters(t *testing.T) {
	for _, r := range "ABCabc012" {
		if _, ok := SymbolToID[r]; !ok {
			t.Errorf("SymbolToID missing letter/digit %q", r)
		}
	}
}

func TestSymbolToIDPad(t *testing.T) {
	id, ok := SymbolToID['_']
	if !ok || id != 0 {
		t.Fatalf("SymbolToID['_'] = (%d, %v), want (0, true) - pad must be symbol ID 0", id, ok)
	}
}