3 more unhandled errors (iotexproject#581)

Author: Yutong Pei

action/protocol/rewarding/fund_test.go

@@ -32,6 +32,7 @@ func TestProtocol_Fund(t *testing.T) {
 		require.NoError(t, stateDB.Commit(ws))
 
 		ws, err = stateDB.NewWorkingSet()
+		require.NoError(t, err)
 		totalBalance, err := p.TotalBalance(ctx, ws)
 		require.NoError(t, err)
 		assert.Equal(t, big.NewInt(5), totalBalance)

action/protocol/rewarding/protocol.go

@@ -138,6 +138,9 @@ func (p *Protocol) ReadState(
 			return nil, err
 		}
 		balance, err := p.UnclaimedBalance(ctx, sm, addr)
+		if err != nil {
+			return nil, err
+		}
 		return []byte(balance.String()), nil
 	default:
 		return nil, errors.New("corresponding method isn't found")

e2etest/rewarding_test.go

@@ -64,6 +64,7 @@ func TestBlockReward(t *testing.T) {
 	pk := &sk.PublicKey
 	pkHash1 := keypair.HashPubKey(pk)
 	addr, err := address.FromBytes(pkHash1[:])
+	require.NoError(t, err)
 
 	blockReward, err := rp.BlockReward(ctx, ws)
 	require.NoError(t, err)