withdraw and max withdraw tests

x/leverage/keeper/msg_server_test.go

@@ -350,6 +350,13 @@ func (s *IntegrationTestSuite) TestMsgWithdraw() {
 	// borrowed value is $10 (current) or $5 (historic)
 	// collateral weights are always 0.25 in testing
 
+	// create an UMEE borrower using STABLE collateral
+	stableUmeeBorrower := s.newAccount(coin.New(stableDenom, 100_000000))
+	s.supply(stableUmeeBorrower, coin.New(stableDenom, 100_000000))
+	s.collateralize(stableUmeeBorrower, coin.New("u/"+stableDenom, 100_000000))
+	s.borrow(stableUmeeBorrower, coin.New(umeeDenom, 30_000000))
+	// UMEE and STABLE have the same price but different collateral weights
+
 	tcs := []struct {
 		msg                  string
 		addr                 sdk.AccAddress
@@ -455,6 +462,14 @@ func (s *IntegrationTestSuite) TestMsgWithdraw() {
 			nil,
 			sdk.Coin{},
 			types.ErrUndercollaterized,
+		}, {
+			"borrow limit (undercollateralized due to borrow factor but not collateral weight)",
+			stableUmeeBorrower,
+			coin.New("u/"+stableDenom, 50_000000),
+			nil,
+			nil,
+			sdk.Coin{},
+			types.ErrUndercollaterized,
 		},
 	}