update

internal/pkg/season/season_test.go

@@ -0,0 +1,28 @@
+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)
+		}
+	}
+}