package natsort

import "testing"

func TestLess(t *testing.T) {
	cases := []struct {
		a, b string
		want bool
	}{
		{"page1", "page2", true},
		{"page2", "page10", true},
		{"page10", "page2", false},
		{"01 - Track.mp3", "02 - Track.mp3", true},
		{"Chapter 1.mp3", "Chapter 10.mp3", true},
		{"Chapter 10.mp3", "Chapter 9.mp3", false},
		{"page01", "page1", false}, // numerically equal
		{"page1", "page01", false},
		{"a", "b", true},
		{"b", "a", false},
		{"", "a", true},
		{"a", "", false},
	}
	for _, c := range cases {
		if got := Less(c.a, c.b); got != c.want {
			t.Errorf("Less(%q, %q) = %v, want %v", c.a, c.b, got, c.want)
		}
	}
}