more platform

projection/helpers_test.go

@@ -0,0 +1,54 @@
+// Local helpers for the snapshot / holder tests — production code does not see
+// them. tProj is a stand-in stored value; the projection package is
+// value-agnostic, so the tests use a small local struct instead of depending on
+// catalog.Projection (the type these tests were extracted alongside).
+package projection
+
+import "os"
+
+// tProj mirrors the fields the ported catalog snapshot tests exercise. Prices
+// are plain int64 here (no money dependency in the generic package).
+type tProj struct {
+	ID          string `json:"id"`
+	SKU         string `json:"sku"`
+	Title       string `json:"title,omitempty"`
+	PriceIncVat int64  `json:"price_inc_vat"`
+	Currency    string `json:"currency,omitempty"`
+	TaxClass    string `json:"tax_class,omitempty"`
+	UpdatedAt   int64  `json:"updated_at,omitempty"`
+}
+
+func os2WriteFile(path string, data []byte, perm os.FileMode) error {
+	return os.WriteFile(path, data, perm)
+}
+
+func os2Stat(path string) (os.FileInfo, error) {
+	return os.Stat(path)
+}
+
+// appendP appends a tProj keyed by its own SKU — the producer/test pattern over
+// the generic SnapshotWriter (Append takes an explicit key).
+func appendP(w *SnapshotWriter[tProj], p tProj) error {
+	return w.Append(p.SKU, p)
+}
+
+// makeProjection builds a tProj fixture.
+func makeProjection(sku string, price int64) tProj {
+	return tProj{
+		ID:          "sku:" + sku,
+		SKU:         sku,
+		Title:       "Item " + sku,
+		PriceIncVat: price,
+		Currency:    "SEK",
+		TaxClass:    "standard",
+		UpdatedAt:   1,
+	}
+}
+
+func repeat32(s string, n int) string {
+	out := make([]byte, 0, n*len(s))
+	for i := 0; i < n; i++ {
+		out = append(out, s...)
+	}
+	return string(out)
+}