Add ContractFallbackCallFailed event

contracts/ERC677BridgeToken.sol

@@ -17,6 +17,8 @@ contract ERC677BridgeToken is
     Version.Version public getTokenInterfacesVersion = Version.Version(2, 0, 0);
     address public bridgeContract;
 
+    event ContractFallbackCallFailed(address from, address to, uint value);
+
     constructor(
         string _name,
         string _symbol,
@@ -53,8 +55,12 @@ contract ERC677BridgeToken is
     function transfer(address _to, uint256 _value) public returns (bool)
     {
         require(superTransfer(_to, _value));
-        if (isContract(_to) && !contractFallback(_to, _value, new bytes(0)) && _to == bridgeContract) {
-            revert();
+        if (isContract(_to) && !contractFallback(_to, _value, new bytes(0))) {
+            if (_to == bridgeContract) {
+                revert();
+            } else {
+                emit ContractFallbackCallFailed(msg.sender, _to, _value);
+            }
         }
         return true;
     }

test/poa20_test.js

@@ -152,6 +152,12 @@ contract('ERC677BridgeToken', async (accounts) => {
         to: validatorContract.address,
         value: minPerTx
       })
+      result.logs[1].event.should.be.equal("ContractFallbackCallFailed")
+      result.logs[1].args.should.be.deep.equal({
+        from: user,
+        to: validatorContract.address,
+        value: minPerTx
+      })
     })
 
     it('fail to send tokens to bridge contract out of limits', async () => {