Fix error messages

chain.go

@@ -51,7 +51,7 @@ func RegisterChainID(blockchain Blockchain, network NetworkID, chainID int) erro
 	k := fmt.Sprintf("%s:%s", blockchain, network)
 	existingChainID, ok := chainIDs[k]
 	if ok && existingChainID != ChainID(chainID) {
-		return fmt.Errorf("chainID %s:%s already registered", blockchain, network)
+		return fmt.Errorf("chainID '%s:%s' already registered with value %d", blockchain, network, existingChainID)
 	}
 	chainIDs[k] = ChainID(chainID)
 

did.go

@@ -152,7 +152,7 @@ var DIDMethodByte = map[DIDMethod]byte{
 func RegisterDIDMethod(m DIDMethod, b byte) error {
 	existingByte, ok := DIDMethodByte[m]
 	if ok && existingByte != b {
-		return fmt.Errorf("DID method %s already registered", m)
+		return fmt.Errorf("DID method '%s' already registered with byte %b", m, existingByte)
 	}
 
 	max := DIDMethodByte[DIDMethodOther]
@@ -276,10 +276,10 @@ func RegisterDIDMethodNetwork(params DIDMethodNetworkParams, opts ...Registratio
 			return err
 		}
 	}
-
-	if existed, ok := DIDMethodNetwork[m][flg]; ok && existed != params.NetworkFlag {
-		return fmt.Errorf("DID method network '%s' with blockchain '%s' and network '%s' already registered",
-			m, b, n)
+	existedFlag, ok := DIDMethodNetwork[m][flg]
+	if ok && existedFlag != params.NetworkFlag {
+		return fmt.Errorf("DID method network '%s' with blockchain '%s' and network '%s' already registered with another flag '%b'",
+			m, b, n, existedFlag)
 	}
 
 	DIDMethodNetwork[m][flg] = params.NetworkFlag

did_test.go

@@ -506,7 +506,7 @@ func TestCustomDIDRegistration_Negative(t *testing.T) {
 				NetworkFlag: 0b0001_0001,
 			},
 			opts: []RegistrationOptions{WithChainID(1)},
-			err:  "chainID polygon:mumbai already registered",
+			err:  "chainID 'polygon:mumbai' already registered with value 80001",
 		},
 		{
 			Description: "try to overwrite existing DID method byte",
@@ -517,7 +517,7 @@ func TestCustomDIDRegistration_Negative(t *testing.T) {
 				NetworkFlag: 0b00100000 | 0b00000001,
 			},
 			opts: []RegistrationOptions{WithChainID(1), WithDIDMethodByte(0b00000010)},
-			err:  "DID method iden3 already registered",
+			err:  "DID method 'iden3' already registered with byte 1",
 		},
 		{
 			Description: "try to write max did method byte",
@@ -539,7 +539,7 @@ func TestCustomDIDRegistration_Negative(t *testing.T) {
 				NetworkFlag: 0b00100000 | 0b00000011,
 			},
 			opts: nil,
-			err:  "DID method network 'iden3' with blockchain 'eth' and network 'main' already registered",
+			err:  "DID method network 'iden3' with blockchain 'eth' and network 'main' already registered with another flag '100001'",
 		},
 	}