@@ -2389,7 +2389,7 @@ func testCustomChannelsLiquidityEdgeCasesCore(ctx context.Context,
23892389 )
23902390 charlieFundingAmount := cents .Amount - uint64 (2 * 400_000 )
23912391
2392- _ , _ , _ = createTestAssetNetwork (
2392+ _ , _ , chanPointEF : =createTestAssetNetwork (
23932393 t , net , charlieTap , daveTap , erinTap , fabiaTap , yaraTap ,
23942394 universeTap , cents , 400_000 , charlieFundingAmount ,
23952395 daveFundingAmount , erinFundingAmount , 0 ,
@@ -2407,6 +2407,37 @@ func testCustomChannelsLiquidityEdgeCasesCore(ctx context.Context,
24072407
24082408 logBalance (t .t , nodes , assetID , "initial" )
24092409
2410+ // Edge case: We send a single satoshi keysend payment from Dave to
2411+ // Fabia. Which will make it so that Fabia's balance in the channel
2412+ // between Erin and her is 1 satoshi, which is below the dust limit.
2413+ // This is only allowed while Fabia doesn't have any assets on her side
2414+ // yet.
2415+ erinFabiaChan := fetchChannel (t .t , fabia , chanPointEF )
2416+ hinEF := & lnrpc.HopHint {
2417+ NodeId : erin .PubKeyStr ,
2418+ ChanId : erinFabiaChan .PeerScidAlias ,
2419+ CltvExpiryDelta : 80 ,
2420+ FeeBaseMsat : 1000 ,
2421+ FeeProportionalMillionths : 1 ,
2422+ }
2423+ sendKeySendPayment (
2424+ t .t , dave , fabia , 1 , withPayRouteHints ([]* lnrpc.RouteHint {{
2425+ HopHints : []* lnrpc.HopHint {hinEF },
2426+ }}),
2427+ )
2428+ logBalance (t .t , nodes , assetID , "after single sat keysend" )
2429+
2430+ // We make sure that a single sat keysend payment is not allowed when
2431+ // it carries assets.
2432+ sendAssetKeySendPayment (
2433+ t .t , erin , fabia , 123 , assetID , fn.Some [int64 ](1 ),
2434+ withPayErrSubStr (
2435+ fmt .Sprintf ("keysend payment satoshi amount must be " +
2436+ "greater than or equal to %d satoshis" ,
2437+ rfqmath .DefaultOnChainHtlcSat ),
2438+ ),
2439+ )
2440+
24102441 // Normal case.
24112442 // Send 50 assets from Charlie to Dave.
24122443 sendAssetKeySendPayment (
@@ -2870,6 +2901,54 @@ func testCustomChannelsLiquidityEdgeCasesCore(ctx context.Context,
28702901 )
28712902
28722903 logBalance (t .t , nodes , assetID , "after safe asset htlc failure" )
2904+
2905+ // Another test case: Make sure an asset invoice contains the correct
2906+ // channel policy. We expect it to be the policy for the direction from
2907+ // edge node to receiver node. To test this, we first set two different
2908+ // policies on the channel between Erin and Fabia.
2909+ resp , err := erin .UpdateChannelPolicy (ctx , & lnrpc.PolicyUpdateRequest {
2910+ Scope : & lnrpc.PolicyUpdateRequest_ChanPoint {
2911+ ChanPoint : chanPointEF ,
2912+ },
2913+ BaseFeeMsat : 31337 ,
2914+ FeeRatePpm : 443322 ,
2915+ TimeLockDelta : 19 ,
2916+ })
2917+ require .NoError (t .t , err )
2918+ require .Empty (t .t , resp .FailedUpdates )
2919+
2920+ resp , err = fabia .UpdateChannelPolicy (ctx , & lnrpc.PolicyUpdateRequest {
2921+ Scope : & lnrpc.PolicyUpdateRequest_ChanPoint {
2922+ ChanPoint : chanPointEF ,
2923+ },
2924+ BaseFeeMsat : 42069 ,
2925+ FeeRatePpm : 223344 ,
2926+ TimeLockDelta : 18 ,
2927+ })
2928+ require .NoError (t .t , err )
2929+ require .Empty (t .t , resp .FailedUpdates )
2930+
2931+ // We now create an invoice on Fabia and expect Erin's policy to be used
2932+ // in the invoice.
2933+ invoiceResp = createAssetInvoice (t .t , erin , fabia , 1_000 , assetID )
2934+ req , err := erin .DecodePayReq (ctx , & lnrpc.PayReqString {
2935+ PayReq : invoiceResp .PaymentRequest ,
2936+ })
2937+ require .NoError (t .t , err )
2938+
2939+ require .Len (t .t , req .RouteHints , 1 )
2940+ require .Len (t .t , req .RouteHints [0 ].HopHints , 1 )
2941+ invoiceHint := req .RouteHints [0 ].HopHints [0 ]
2942+ require .Equal (t .t , erin .PubKeyStr , invoiceHint .NodeId )
2943+ require .EqualValues (t .t , 31337 , invoiceHint .FeeBaseMsat )
2944+ require .EqualValues (t .t , 443322 , invoiceHint .FeeProportionalMillionths )
2945+ require .EqualValues (t .t , 19 , invoiceHint .CltvExpiryDelta )
2946+
2947+ // Now we pay the invoice and expect the same policy with very expensive
2948+ // fees to be used.
2949+ payInvoiceWithSatoshi (
2950+ t .t , dave , invoiceResp , withFeeLimit (100_000_000 ),
2951+ )
28732952}
28742953
28752954// testCustomChannelsLiquidityEdgeCases is a test that runs through some
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