diff --git a/types/evidence.go b/types/evidence.go
index 266375ec..6313f43a 100644
--- a/types/evidence.go
+++ b/types/evidence.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"fmt"
 
-	"github.com/tendermint/go-amino"
+	amino "github.com/tendermint/go-amino"
 
 	"github.com/tendermint/tendermint/crypto"
 	"github.com/tendermint/tendermint/crypto/merkle"
diff --git a/types/evidence_test.go b/types/evidence_test.go
index 5bbb2a37..54eba01c 100644
--- a/types/evidence_test.go
+++ b/types/evidence_test.go
@@ -36,7 +36,7 @@ func TestEvidence(t *testing.T) {
 	blockID3 := makeBlockID("blockhash", 10000, "partshash")
 	blockID4 := makeBlockID("blockhash", 10000, "partshash2")
 
-	chainID := "mychain"
+	const chainID = "mychain"
 
 	vote1 := makeVote(val, chainID, 0, 10, 2, 1, blockID)
 	badVote := makeVote(val, chainID, 0, 10, 2, 1, blockID)
@@ -72,3 +72,30 @@ func TestEvidence(t *testing.T) {
 		}
 	}
 }
+
+func TestDuplicatedVoteEvidence(t *testing.T) {
+	ev := randomDuplicatedVoteEvidence()
+
+	assert.True(t, ev.Equal(ev))
+	assert.False(t, ev.Equal(&DuplicateVoteEvidence{}))
+}
+
+func TestEvidenceList(t *testing.T) {
+	ev := randomDuplicatedVoteEvidence()
+	evl := EvidenceList([]Evidence{ev})
+
+	assert.NotNil(t, evl.Hash())
+	assert.True(t, evl.Has(ev))
+	assert.False(t, evl.Has(&DuplicateVoteEvidence{}))
+}
+
+func randomDuplicatedVoteEvidence() *DuplicateVoteEvidence {
+	val := NewMockPV()
+	blockID := makeBlockID("blockhash", 1000, "partshash")
+	blockID2 := makeBlockID("blockhash2", 1000, "partshash")
+	const chainID = "mychain"
+	return &DuplicateVoteEvidence{
+		VoteA: makeVote(val, chainID, 0, 10, 2, 1, blockID),
+		VoteB: makeVote(val, chainID, 0, 10, 2, 1, blockID2),
+	}
+}