# 2008 August 01

 #

 # The author disclaims copyright to this source code.  In place of

 # a legal notice, here is a blessing:

 #

 #    May you do good and not evil.

 #    May you find forgiveness for yourself and forgive others.

 #    May you share freely, never taking more than you give.

 #

 #***********************************************************************

 #

 # Tests for the lookaside memory allocator.

 #

 # $Id: lookaside.test,v 1.6 2008/09/30 00:31:38 drh Exp $

 set testdir [file dirname $argv0]

 source $testdir/tester.tcl

 catch {db close}

 sqlite3_shutdown

 sqlite3_config_pagecache 0 0

 sqlite3_config_scratch 0 0

 sqlite3_initialize

 sqlite3 db test.db

 # Make sure sqlite3_db_config() and sqlite3_db_status are working.

 #

 do_test lookaside-1.1 {

   catch {sqlite3_config_error db}

 } {0}

 do_test lookaside-1.2 {

   sqlite3_db_config_lookaside db 1 18 18

 } {0}

 do_test lookaside-1.3 {

   sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 0

 } {0 0 0}

 do_test lookaside-1.4 {

   db eval {CREATE TABLE t1(w,x,y,z);}

   foreach {x y z} [sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 0] break

   expr {$x==0 && $y<$z && $z==18}

 } {1}

 do_test lookaside-1.5 {

   foreach {x y z} [sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 1] break

   expr {$x==0 && $y<$z && $z==18}

 } {1}

 do_test lookaside-1.6 {

   foreach {x y z} [sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 0] break

   expr {$x==0 && $y==$z && $y<18}

 } {1}

 do_test lookaside-1.7 {

   db cache flush

   foreach {x y z} [sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 0] break

   expr {$x==0 && $y==0 && $z<18}

 } {1}

 do_test lookaside-1.8 {

   db cache flush

   foreach {x y z} [sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 1] break

   expr {$x==0 && $y==0 && $z<18}

 } {1}

 do_test lookaside-1.9 {

   db cache flush

   sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 0

 } {0 0 0}

 do_test lookaside-2.1 {

   sqlite3_db_config_lookaside db 0 100 1000

 } {0}

 do_test lookaside-2.2 {

   db eval {CREATE TABLE t2(x);}

   foreach {x y z} [sqlite3_db_status db SQLITE_DBSTATUS_LOOKASIDE_USED 0] break

   expr {$x==0 && $y<$z && $z>10 && $z<100}

 } {1}

 do_test lookaside-2.3 {

   sqlite3_db_config_lookaside db 0 50 50

 } {5}  ;# SQLITE_BUSY

 do_test lookaside-2.4 {

   db cache flush

   sqlite3_db_config_lookaside db 0 50 50

 } {0}  ;# SQLITE_OK

 # sqlite3_db_status() with an invalid verb returns an error.

 #

 do_test lookaside-3.1 {

   sqlite3_db_status db 99999 0

 } {1 0 0}

 # Test that an invalid verb on sqlite3_config() is detected and

 # reported as an error.

 #

 do_test lookaside-4.1 {

   db close

   sqlite3_shutdown

   catch sqlite3_config_error

 } {0}

 sqlite3_initialize

 finish_test