package season

import "testing"

func TestDerive(t *testing.T) {
	cases := []struct {
		year   uint16
		col    string
		season string
		want   string
	}{
		{2026, ColRTW, SeasonSpring, "SS26"},
		{2025, "", SeasonFall, "FW25"},
		{2026, ColResort, "", "RES26"},
		{2026, ColPreFall, "", "PF26"},
		{2025, ColMenswear, "", "FW25"},
		{2025, ColCouture, "", "FW25"},
		{2026, "", "", "SS26"},        // 二者皆空回落 SS
		{0, ColRTW, SeasonSpring, ""}, // 未知年份无法编码
		{2099, ColRTW, SeasonSpring, "SS99"},
	}
	for _, c := range cases {
		got := Derive(c.year, c.col, c.season)
		if got != c.want {
			t.Fatalf("Derive(%d,%q,%q)=%q want %q", c.year, c.col, c.season, got, c.want)
		}
	}
}