added valid sorted coin testcase

Author: spoo-bar

x/bank/types/balance_test.go

@@ -87,6 +87,18 @@ func TestBalanceValidate(t *testing.T) {
 			},
 			true,
 		},
+		{
+			"valid sorted coins",
+			bank.Balance{
+				Address: "cosmos1yq8lgssgxlx9smjhes6ryjasmqmd3ts2559g0t",
+				Coins: sdk.Coins{
+					sdk.NewInt64Coin("atom", 2),
+					sdk.NewInt64Coin("batom", 12),
+					sdk.NewInt64Coin("zatom", 2),
+				},
+			},
+			false,
+		},
 	}
 
 	for _, tc := range testCases {