From 07a65cbac7547e31320d589834e40a04de2b4fdb Mon Sep 17 00:00:00 2001
From: Ben Johnson <benbjohnson@yahoo.com>
Date: Sat, 16 Jan 2021 10:04:03 -0700
Subject: [PATCH] Fix crc64 unit test

---
 db.go      | 6 ++++++
 db_test.go | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/db.go b/db.go
index d206991..8e55cb6 100644
--- a/db.go
+++ b/db.go
@@ -1485,6 +1485,12 @@ func (db *DB) CRC64() (uint64, Pos, error) {
 	db.mu.Lock()
 	defer db.mu.Unlock()
 
+	if err := db.init(); err != nil {
+		return 0, Pos{}, err
+	} else if db.db == nil {
+		return 0, Pos{}, os.ErrNotExist
+	}
+
 	// Force a RESTART checkpoint to ensure the database is at the start of the WAL.
 	if err := db.checkpoint(CheckpointModeRestart); err != nil {
 		return 0, Pos{}, err
diff --git a/db_test.go b/db_test.go
index a973ef1..d848e89 100644
--- a/db_test.go
+++ b/db_test.go
@@ -137,8 +137,8 @@ func TestDB_CRC64(t *testing.T) {
 			t.Fatal(err)
 		} else if chksum1, _, err := db.CRC64(); err != nil {
 			t.Fatal(err)
-		} else if chksum0 != chksum1 {
-			t.Fatal("expected equal checksum after WAL change")
+		} else if chksum0 == chksum1 {
+			t.Fatal("expected different checksum event after WAL change")
 		}
 
 		// Checkpoint change into database. Checksum should change.