feat(suitbuilder): CD-tier filter helpers + tests; gate inventory-go build on go test

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

go-services/inventory-go/suit_cd_test.go

@@ -0,0 +1,82 @@
+package main
+
+import "testing"
+
+func TestCritTier(t *testing.T) {
+	cases := []struct {
+		rating, want int
+	}{{-1, 0}, {0, 0}, {1, 1}, {2, 2}, {3, 2}, {5, 2}}
+	for _, c := range cases {
+		if got := critTier(c.rating); got != c.want {
+			t.Errorf("critTier(%d) = %d, want %d", c.rating, got, c.want)
+		}
+	}
+}
+
+func TestAllowedCritSet(t *testing.T) {
+	for _, vals := range [][]int{nil, {}, {0, 1, 2}, {0, 1, 3}} {
+		if allowedCritSet(vals) != nil {
+			t.Errorf("allowedCritSet(%v) should be nil (inactive)", vals)
+		}
+	}
+	if s := allowedCritSet([]int{1}); s == nil || !s[1] || s[0] || s[2] {
+		t.Errorf("allowedCritSet({1}) = %v, want only tier 1", s)
+	}
+	if s := allowedCritSet([]int{0, 1}); s == nil || !s[0] || !s[1] || s[2] {
+		t.Errorf("allowedCritSet({0,1}) = %v, want tiers 0,1", s)
+	}
+	if s := allowedCritSet([]int{3}); s == nil || !s[2] || s[0] || s[1] {
+		t.Errorf("allowedCritSet({3}) = %v, want only tier 2 (normalized)", s)
+	}
+}
+
+func TestIsArmorSlot(t *testing.T) {
+	for _, s := range []string{"Chest", "Head", "Feet", "Chest, Abdomen", "Upper Legs, Lower Legs"} {
+		if !isArmorSlot(s) {
+			t.Errorf("isArmorSlot(%q) = false, want true", s)
+		}
+	}
+	for _, s := range []string{"Neck", "Left Ring", "Left Wrist", "Trinket", "Shirt", "Pants", "Unknown", ""} {
+		if isArmorSlot(s) {
+			t.Errorf("isArmorSlot(%q) = true, want false", s)
+		}
+	}
+}
+
+func cdItem(slot string, cd int) *SuitItem {
+	return &SuitItem{Slot: slot, Ratings: map[string]int{"crit_damage_rating": cd}}
+}
+
+func TestFilterArmorByCD(t *testing.T) {
+	items := []*SuitItem{
+		cdItem("Chest", 0), cdItem("Head", 1), cdItem("Feet", 2),
+		cdItem("Chest, Abdomen", 2), // multi-coverage armor, CD2
+		cdItem("Neck", 0),           // jewelry — never filtered
+		cdItem("Shirt", 0),          // clothing — never filtered
+	}
+
+	if got := filterArmorByCD(items, nil); len(got) != len(items) {
+		t.Errorf("nil filter dropped items: got %d, want %d", len(got), len(items))
+	}
+
+	got := filterArmorByCD(items, map[int]bool{1: true})
+	keep := map[string]bool{"Head": true, "Neck": true, "Shirt": true}
+	if len(got) != 3 {
+		t.Fatalf("allowed{1}: got %d items, want 3", len(got))
+	}
+	for _, it := range got {
+		if !keep[it.Slot] {
+			t.Errorf("allowed{1}: unexpected slot %q survived", it.Slot)
+		}
+	}
+
+	got = filterArmorByCD(items, map[int]bool{0: true, 1: true})
+	if len(got) != 4 { // Chest(0), Head(1), Neck, Shirt
+		t.Errorf("allowed{0,1}: got %d items, want 4", len(got))
+	}
+	for _, it := range got {
+		if isArmorSlot(it.Slot) && it.Ratings["crit_damage_rating"] >= 2 {
+			t.Errorf("allowed{0,1}: CD2 armor %q should have been dropped", it.Slot)
+		}
+	}
+}