...

x/distribution/keeper/delegation_test.go

@@ -4,6 +4,7 @@ import "testing"
 
 func TestWithdrawDelegationReward(t *testing.T) {
 
+	keeper.WithdrawDelegationReward(ctx, delAddr1, valAddr1)
 }
 
 func TestWithdrawDelegationRewardsAll(t *testing.T) {

x/distribution/keeper/test_utils.go

@@ -0,0 +1,27 @@
+package types
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/tendermint/tendermint/crypto"
+	"github.com/tendermint/tendermint/crypto/ed25519"
+)
+
+var (
+	delPk1       = ed25519.GenPrivKey().PubKey()
+	delPk2       = ed25519.GenPrivKey().PubKey()
+	delPk3       = ed25519.GenPrivKey().PubKey()
+	delAddr1     = sdk.AccAddress(delPk1.Address())
+	delAddr2     = sdk.AccAddress(delPk2.Address())
+	delAddr3     = sdk.AccAddress(delPk3.Address())
+	emptyDelAddr sdk.AccAddress
+
+	valPk1       = ed25519.GenPrivKey().PubKey()
+	valPk2       = ed25519.GenPrivKey().PubKey()
+	valPk3       = ed25519.GenPrivKey().PubKey()
+	valAddr1     = sdk.ValAddress(delPk1.Address())
+	valAddr2     = sdk.ValAddress(delPk2.Address())
+	valAddr3     = sdk.ValAddress(delPk3.Address())
+	emptyValAddr sdk.ValAddress
+
+	emptyPubkey crypto.PubKey
+)