More DB and Checkpoint tests

db/db_test.go

@@ -492,6 +492,8 @@ func Test_WALDatabaseCreatedOK(t *testing.T) {
 	}
 }
 
+// Test_WALDatabaseCheckpointOKNoWAL tests that a checkpoint succeeds
+// even when no WAL file exists.
 func Test_WALDatabaseCheckpointOKNoWAL(t *testing.T) {
 	path := mustTempFile()
 	defer os.Remove(path)
@@ -512,6 +514,25 @@ func Test_WALDatabaseCheckpointOKNoWAL(t *testing.T) {
 	}
 }
 
+// Test_WALDatabaseCheckpointOKDelete tests that a checkpoint returns no error
+// even when the database is opened in DELETE mode.
+func Test_WALDatabaseCheckpointOKDelete(t *testing.T) {
+	path := mustTempFile()
+	defer os.Remove(path)
+
+	db, err := Open(path, false, false)
+	if err != nil {
+		t.Fatalf("failed to open database in DELETE mode: %s", err.Error())
+	}
+	if db.WALEnabled() {
+		t.Fatalf("WAL mode enabled")
+	}
+	defer db.Close()
+	if err := db.Checkpoint(); err != nil {
+		t.Fatalf("failed to checkpoint database in DELETE mode: %s", err.Error())
+	}
+}
+
 // Test_WALDatabaseCreatedOKFromDELETE tests that a WAL database is created properly,
 // even when supplied with a DELETE-mode database.
 func Test_WALDatabaseCreatedOKFromDELETE(t *testing.T) {