fix: condition + add test

Author: rach-id

types/row_proof.go

@@ -36,7 +36,7 @@ func (rp RowProof) Validate(root []byte) error {
 	}
 	if len(rp.Proofs) != 0 &&
 		(int64(rp.StartRow) != rp.Proofs[0].Index ||
-			int64(rp.StartRow) != rp.Proofs[len(rp.Proofs)-1].Index) {
+			int64(rp.EndRow) != rp.Proofs[len(rp.Proofs)-1].Index) {
 		return fmt.Errorf("invalid start/end row")
 	}
 	if !rp.VerifyProof(root) {

types/row_proof_test.go

@@ -59,6 +59,26 @@ func TestRowProofValidate(t *testing.T) {
 			root:    root,
 			wantErr: true,
 		},
+		{
+			name: "invalid start row",
+			rp: func() RowProof {
+				proof := validRowProof()
+				proof.StartRow += 1
+				return proof
+			}(),
+			root:    root,
+			wantErr: true,
+		},
+		{
+			name: "invalid end row",
+			rp: func() RowProof {
+				proof := validRowProof()
+				proof.EndRow += 1
+				return proof
+			}(),
+			root:    root,
+			wantErr: true,
+		},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {