add RewardsCoordinatorAddr to the ContractAddresses struct and use it…

… in the test

chainio/clients/elcontracts/writer_test.go

@@ -172,9 +172,8 @@ func TestSetClaimerFor(t *testing.T) {
 
 	privateKeyHex := "ac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80"
 	contractAddrs := testutils.GetContractAddressesFromContractRegistry(anvilHttpEndpoint)
-	// TODO: fetch this address from ContractRegistry (currently returns zero address)
-	rewardsCoordinatorAddr := common.HexToAddress("0x2279B7A0a67DB372996a5FaB50D91eAA73d2eBe6")
 
+	rewardsCoordinatorAddr := contractAddrs.RewardsCoordinator
 	config := elcontracts.Config{
 		DelegationManagerAddress:  contractAddrs.DelegationManager,
 		RewardsCoordinatorAddress: rewardsCoordinatorAddr,

testutils/anvil.go

@@ -65,6 +65,7 @@ type ContractAddresses struct {
 	OperatorStateRetriever common.Address
 	DelegationManager      common.Address
 	Erc20MockStrategy      common.Address
+	RewardsCoordinator     common.Address
 }
 
 func GetContractAddressesFromContractRegistry(ethHttpUrl string) (mockAvsContracts ContractAddresses) {
@@ -121,12 +122,20 @@ func GetContractAddressesFromContractRegistry(ethHttpUrl string) (mockAvsContrac
 	if erc20MockStrategyAddr == (common.Address{}) {
 		panic("erc20MockStrategyAddr is empty")
 	}
+	rewardsCoordinatorAddr, err := contractsRegistry.Contracts(&bind.CallOpts{}, "rewardsCoordinator")
+	if err != nil {
+		panic(err)
+	}
+	if rewardsCoordinatorAddr == (common.Address{}) {
+		panic("rewardsCoordinatorAddr is empty")
+	}
 	mockAvsContracts = ContractAddresses{
 		ServiceManager:         mockAvsServiceManagerAddr,
 		RegistryCoordinator:    mockAvsRegistryCoordinatorAddr,
 		OperatorStateRetriever: mockAvsOperatorStateRetrieverAddr,
 		DelegationManager:      delegationManagerAddr,
 		Erc20MockStrategy:      erc20MockStrategyAddr,
+		RewardsCoordinator:     rewardsCoordinatorAddr,
 	}
 	return mockAvsContracts
 }