f - check quantity against offer upfront

Author: jkczyz

lightning/src/offers/invoice_request.rs

@@ -129,6 +129,12 @@ impl<'a> InvoiceRequestBuilder<'a> {
 		Ok(self)
 	}
 
+	#[cfg(test)]
+	pub fn quantity_unchecked(mut self, quantity: u64) -> Self {
+		self.invoice_request.quantity = Some(quantity);
+		self
+	}
+
 	/// Sets the [`InvoiceRequest::payer_note`].
 	///
 	/// Successive calls to this method will override the previous setting.
@@ -955,7 +961,7 @@ mod tests {
 			.build().unwrap()
 			.request_invoice(vec![1; 32], payer_pubkey())
 			.amount_msats(2_000)
-			.quantity(2)
+			.quantity_unchecked(2)
 			.build_unchecked()
 			.sign(payer_sign).unwrap();
 
@@ -975,7 +981,7 @@ mod tests {
 			.build().unwrap()
 			.request_invoice(vec![1; 32], payer_pubkey())
 			.amount_msats(10_000)
-			.quantity(10)
+			.quantity(10).unwrap()
 			.build().unwrap()
 			.sign(payer_sign).unwrap();
 
@@ -992,7 +998,7 @@ mod tests {
 			.build().unwrap()
 			.request_invoice(vec![1; 32], payer_pubkey())
 			.amount_msats(11_000)
-			.quantity(11)
+			.quantity_unchecked(11)
 			.build_unchecked()
 			.sign(payer_sign).unwrap();
 
@@ -1010,7 +1016,7 @@ mod tests {
 			.build().unwrap()
 			.request_invoice(vec![1; 32], payer_pubkey())
 			.amount_msats(2_000)
-			.quantity(2)
+			.quantity(2).unwrap()
 			.build().unwrap()
 			.sign(payer_sign).unwrap();