added a ton of tests for new plan, immediate and scheduled switch

shared/utils/cusProductUtils/featureOptionUtils/convertFeatureOptions.ts

@@ -0,0 +1,29 @@
+import type { FeatureOptions } from "@models/cusProductModels/cusProductModels";
+import type { EntitlementWithFeature } from "@models/productModels/entModels/entModels";
+import type { Price } from "@models/productModels/priceModels/priceModels";
+import { priceUtils } from "@utils/productUtils/priceUtils/index";
+import { Decimal } from "decimal.js";
+
+export const featureOptionsToV2StripeQuantity = ({
+	featureOptions,
+	price,
+	entitlement,
+}: {
+	featureOptions?: FeatureOptions;
+	price: Price;
+	entitlement: EntitlementWithFeature;
+}) => {
+	const packsExcludingAllowance =
+		featureOptions?.upcoming_quantity ?? featureOptions?.quantity;
+
+	const allowanceInPacks = priceUtils.convert.toAllowanceInPacks({
+		price,
+		entitlement,
+	});
+
+	// 1. If no packs, return allowance
+	if (!packsExcludingAllowance) return allowanceInPacks;
+
+	// 2. Otherwise, return the total quantity
+	return new Decimal(packsExcludingAllowance).add(allowanceInPacks).toNumber();
+};