FAB-11081 check marshaled json for eth RPC fields

 - explicitly list the fields and check for existence of exactly that list

Change-Id: I2ef4ed0c9ea97b669aff2c7440e13e5a3701326c
Signed-off-by: Morgan Bauer <mbauer@us.ibm.com>

fabproxy/ethservice_types_roundtrip_test.go

@@ -0,0 +1,53 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package fabproxy_test
+
+import (
+	"encoding/json"
+	"reflect"
+
+	"github.com/hyperledger/fabric-chaincode-evm/fabproxy"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("ethereum json rpc struct fields", func() {
+	By("that match case exactly, in camelCase starting with a lowercase letter")
+	assertTypeMarshalsJSONFields := func(fieldNames []string, itype interface{}) {
+		b, err := json.Marshal(itype)
+		Expect(err).ToNot(HaveOccurred())
+		m := make(map[string]interface{})
+		err = json.Unmarshal(b, &m)
+		Expect(err).ToNot(HaveOccurred())
+		Expect(m).To(HaveLen(len(fieldNames)), "did you add a field to this type? %q", reflect.TypeOf(itype))
+		for _, fieldName := range fieldNames {
+			_, ok := m[fieldName]
+			Expect(ok).To(BeTrue(), "couldn't find an expected field %q in this type", fieldName)
+		}
+	}
+
+	It("for TxReceipt with the proper cases", func() {
+		fieldNames := []string{"transactionHash", "transactionIndex",
+			"blockHash", "blockNumber", "contractAddress", "gasUsed",
+			"cumulativeGasUsed", "to", "status", "logs"}
+		assertTypeMarshalsJSONFields(fieldNames, fabproxy.TxReceipt{})
+	})
+	It("for Log subobjects in TxReceipt with the proper cases", func() {
+		fieldNames := []string{"address", "topics", "data", "blockNumber",
+			"transactionHash", "transactionIndex", "blockHash", "logIndex"}
+		assertTypeMarshalsJSONFields(fieldNames, fabproxy.Log{})
+	})
+	It("for Transaction with the proper cases", func() {
+		fieldNames := []string{"blockHash", "blockNumber", "to", "input", "transactionIndex", "hash"}
+		assertTypeMarshalsJSONFields(fieldNames, fabproxy.Transaction{})
+	})
+	It("for Block with the proper cases", func() {
+		fieldNames := []string{"number", "hash", "parentHash", "transactions"}
+		assertTypeMarshalsJSONFields(fieldNames, fabproxy.Block{})
+	})
+})