Changes miningReward method to calculate the reward for block zero correctly

ethereum/client.go

@@ -1067,14 +1067,10 @@ func (ec *Client) populateTransaction(
 // for a given block height.
 //
 // Source:
-// https://github.com/ethereum/go-ethereum/master/consensus/ethash/consensus.go#L619-L645
+// https://github.com/ethereum/go-ethereum/blob/master/consensus/ethash/consensus.go#L646-L653
 func (ec *Client) miningReward(
 	currentBlock *big.Int,
 ) int64 {
-	if currentBlock.Int64() == int64(0) {
-		return big.NewInt(0).Int64()
-	}
-
 	blockReward := ethash.FrontierBlockReward.Int64()
 	if ec.p.IsByzantium(currentBlock) {
 		blockReward = ethash.ByzantiumBlockReward.Int64()

ethereum/client_test.go

@@ -1392,6 +1392,59 @@ func TestBlock_Index(t *testing.T) {
 	mockGraphQL.AssertExpectations(t)
 }
 
+func TestBlock_FirstBlock(t *testing.T) {
+	mockJSONRPC := &mocks.JSONRPC{}
+	mockGraphQL := &mocks.GraphQL{}
+
+	tc, err := testTraceConfig()
+	assert.NoError(t, err)
+	c := &Client{
+		c:              mockJSONRPC,
+		g:              mockGraphQL,
+		tc:             tc,
+		p:              params.RopstenChainConfig,
+		traceSemaphore: semaphore.NewWeighted(100),
+	}
+
+	ctx := context.Background()
+	mockJSONRPC.On(
+		"CallContext",
+		ctx,
+		mock.Anything,
+		"eth_getBlockByNumber",
+		"0x0",
+		true,
+	).Return(
+		nil,
+	).Run(
+		func(args mock.Arguments) {
+			r := args.Get(1).(*json.RawMessage)
+
+			file, err := ioutil.ReadFile("testdata/block_0.json")
+			assert.NoError(t, err)
+
+			*r = file
+		},
+	).Once()
+
+	correctRaw, err := ioutil.ReadFile("testdata/block_response_0.json")
+	assert.NoError(t, err)
+	var correct *RosettaTypes.BlockResponse
+	assert.NoError(t, json.Unmarshal(correctRaw, &correct))
+
+	resp, err := c.Block(
+		ctx,
+		&RosettaTypes.PartialBlockIdentifier{
+			Index: RosettaTypes.Int64(0),
+		},
+	)
+	assert.Equal(t, correct.Block, resp)
+	assert.NoError(t, err)
+
+	mockJSONRPC.AssertExpectations(t)
+	mockGraphQL.AssertExpectations(t)
+}
+
 func jsonifyBlock(b *RosettaTypes.Block) (*RosettaTypes.Block, error) {
 	bytes, err := json.Marshal(b)
 	if err != nil {

ethereum/testdata/block_0.json

@@ -0,0 +1,22 @@
+{
+  "difficulty": "0x400000000",
+  "extraData": "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa",
+  "gasLimit": "0x1388",
+  "gasUsed": "0x0",
+  "hash": "0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3",
+  "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+  "miner": "0x0000000000000000000000000000000000000000",
+  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+  "nonce": "0x0000000000000042",
+  "number": "0x0",
+  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+  "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+  "size": "0x21c",
+  "stateRoot": "0xd7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544",
+  "timestamp": "0x0",
+  "totalDifficulty": "0x400000000",
+  "transactions": [],
+  "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+  "uncles": []
+}

ethereum/testdata/block_response_0.json

@@ -0,0 +1,39 @@
+{
+    "block":{
+        "block_identifier":{
+            "index":0,
+            "hash":"0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
+        },
+        "parent_block_identifier":{
+            "index":0,
+            "hash":"0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
+        },
+        "timestamp":0,
+        "transactions":[
+            {
+                "transaction_identifier":{
+                    "hash":"0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
+                },
+                "operations":[
+                    {
+                        "operation_identifier":{
+                            "index":0
+                        },
+                        "type":"MINER_REWARD",
+                        "status":"SUCCESS",
+                        "account":{
+                            "address":"0x0000000000000000000000000000000000000000"
+                        },
+                        "amount":{
+                            "value":"5000000000000000000",
+                            "currency":{
+                                "symbol":"ETH",
+                                "decimals":18
+                            }
+                        }
+                    }
+                ]
+            }
+        ]
+    }
+}