Fix prices function

evm/src/balancer-v2/BalancerV2SwapAdapter.sol

@@ -106,6 +106,7 @@ contract BalancerV2SwapAdapter is ISwapAdapter {
         address buyToken,
         uint256[] memory specifiedAmounts
     ) external returns (Fraction[] memory calculatedPrices) {
+        calculatedPrices = new Fraction[](specifiedAmounts.length);
         for (uint256 i = 0; i < specifiedAmounts.length; i++) {
             calculatedPrices[i] =
                 priceSingle(poolId, sellToken, buyToken, specifiedAmounts[i]);

evm/test/BalancerV2SwapAdapter.t.sol

@@ -40,8 +40,8 @@ contract BalancerV2SwapAdapterTest is Test, ISwapAdapterTypes {
 
     function testPrice() public {
         uint256[] memory amounts = new uint256[](2);
-        amounts[0] = amount0;
-        amounts[1] = amount1;
+        amounts[0] = 1e18;
+        amounts[1] = 2e18;
 
         Fraction[] memory prices = adapter.price(B_80BAL_20WETH_POOL_ID, BAL, WETH, amounts);