evm: fix format errors in String() of QueryEthLogs (#748)

* FIX: format errors in String() of QueryETHLogs

* FINISH: add change log

CHANGELOG.md

@@ -44,6 +44,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (evm) [\#747](https://github.com/cosmos/ethermint/issues/747) Fix format errors in String() of QueryETHLogs
 * (evm) [\#687](https://github.com/cosmos/ethermint/issues/687) Fix nonce check to explicitly check for the correct nonce, rather than a simple 'greater than' comparison. 
 * (api) [\#687](https://github.com/cosmos/ethermint/issues/687) Returns error for a transaction with an incorrect nonce. 
 * (evm) [\#674](https://github.com/cosmos/ethermint/issues/674) Reset all cache after account data has been committed in `EndBlock` to make sure every node state consistent.

x/evm/types/querier.go

@@ -71,7 +71,13 @@ type QueryETHLogs struct {
 }
 
 func (q QueryETHLogs) String() string {
-	return fmt.Sprintf("%+v", q.Logs)
+	var logsStr string
+	logsLen := len(q.Logs)
+	for i := 0; i < logsLen; i++ {
+		logsStr = fmt.Sprintf("%s%v\n", logsStr, *q.Logs[i])
+	}
+
+	return logsStr
 }
 
 // QueryBloomFilter is response type for tx logs query

x/evm/types/querier_test.go

@@ -0,0 +1,26 @@
+package types
+
+import (
+	ethtypes "github.com/ethereum/go-ethereum/core/types"
+	"github.com/stretchr/testify/require"
+	"strings"
+	"testing"
+)
+
+func TestQueryETHLogs_String(t *testing.T) {
+	const expectedQueryETHLogsStr = `{0x0000000000000000000000000000000000000000 [] [1 2 3 4] 9 0x0000000000000000000000000000000000000000000000000000000000000000 0 0x0000000000000000000000000000000000000000000000000000000000000000 0 false}
+{0x0000000000000000000000000000000000000000 [] [5 6 7 8] 10 0x0000000000000000000000000000000000000000000000000000000000000000 0 0x0000000000000000000000000000000000000000000000000000000000000000 0 false}
+`
+	logs := []*ethtypes.Log{
+		{
+			Data:        []byte{1, 2, 3, 4},
+			BlockNumber: 9,
+		},
+		{
+			Data:        []byte{5, 6, 7, 8},
+			BlockNumber: 10,
+		},
+	}
+
+	require.True(t, strings.EqualFold(expectedQueryETHLogsStr, QueryETHLogs{logs}.String()))
+}