From daa0b027ec35ccf2722e1d8a828770668c60e65a Mon Sep 17 00:00:00 2001
From: Al Cutter <al@google.com>
Date: Thu, 14 Dec 2023 18:22:13 +0000
Subject: [PATCH] Test

---
 client/client_test.go | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/client/client_test.go b/client/client_test.go
index 5499f72..b3625a4 100644
--- a/client/client_test.go
+++ b/client/client_test.go
@@ -48,7 +48,7 @@ func mustMakeVerifier(vs string) note.Verifier {
 
 func mustLoadTestCheckpoints() ([][]byte, []log.Checkpoint) {
 	raws, cps := make([][]byte, 0), make([]log.Checkpoint, 0)
-	for i := 1; ; i++ {
+	for i := 0; ; i++ {
 		cpName := fmt.Sprintf("checkpoint.%d", i)
 		r, err := testLogFetcher(context.Background(), cpName)
 		if err != nil {
@@ -335,3 +335,16 @@ func TestNodeCacheHandlesInvalidRequest(t *testing.T) {
 		t.Error("got no error, want error because ID is out of range")
 	}
 }
+
+func TestHandleZeroRoot(t *testing.T) {
+	zeroCP := testCheckpoints[0]
+	if zeroCP.Size != 0 {
+		t.Fatal("BadData: checkpoint has non-zero size")
+	}
+	if len(zeroCP.Hash) == 0 {
+		t.Fatal("BadTestData: checkpoint.0 has empty root hash")
+	}
+	if _, err := NewProofBuilder(context.Background(), zeroCP, rfc6962.DefaultHasher.HashChildren, testLogFetcher); err != nil {
+		t.Fatalf("NewProofBuilder: %v", err)
+	}
+}