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+# 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 1.10 2009/04/09 01:23:49 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+ifcapable !lookaside {
+  finish_test
+  return
+}
+
+# The tests in this file configure the lookaside allocator after a 
+# connection is opened. This will not work if there is any "presql"
+# configured (SQL run within the [sqlite3] wrapper in tester.tcl).
+if {[info exists ::G(perm:dbconfig)] && $::G(perm:dbconfig)!=""} {
+  finish_test
+  return
+}
+
+test_set_config_pagecache 0 0
+
+catch {db close}
+sqlite3_shutdown
+sqlite3_initialize
+autoinstall_test_functions
+
+sqlite3 db test.db
+db cache size 4
+
+# Make sure sqlite3_db_config() and sqlite3_db_status are working.
+#
+do_test lookaside-1.1 {
+  catch {sqlite3_config_error db}
+} {0}
+
+do_test lookaside-1.2 {
+  sqlite3_db_config_lookaside db 1 18 18
+} {0}
+do_test lookaside-1.3.1 {
+  sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 0
+} {0 0 0}
+do_test lookaside-1.3.2 {
+  sqlite3_db_status db DBSTATUS_LOOKASIDE_HIT 0
+} {0 0 0}
+do_test lookaside-1.3.3 {
+  sqlite3_db_status db DBSTATUS_LOOKASIDE_MISS_SIZE 0
+} {0 0 0}
+do_test lookaside-1.3.4 {
+  sqlite3_db_status db DBSTATUS_LOOKASIDE_MISS_FULL 0
+} {0 0 0}
+
+do_test lookaside-1.4 {
+  db eval {CREATE TABLE t1(w,x,y,z);}
+  foreach {x y z} [sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 0] break
+  set p [lindex [sqlite3_db_status db DBSTATUS_LOOKASIDE_HIT 0] 2]
+  set q [lindex [sqlite3_db_status db DBSTATUS_LOOKASIDE_MISS_SIZE 0] 2]
+  set r [lindex [sqlite3_db_status db DBSTATUS_LOOKASIDE_MISS_FULL 0] 2]
+  expr {$x==0 && $y<$z && $z==18 && $p>0 && $q>0 && $r>0}
+} {0}
+do_test lookaside-1.5 {
+  foreach {x y z} [sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 1] break
+  expr {$x==0 && $y<$z && $z==18}
+} {0}
+do_test lookaside-1.6 {
+  foreach {x y z} [sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 0] break
+  expr {$x==0 && $y==$z && $y<18}
+} {1}
+do_test lookaside-1.7 {
+  db cache flush
+  foreach {x y z} [sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 0] break
+  expr {$x==0 && $y==0 && $z<18}
+} {1}
+do_test lookaside-1.8 {
+  db cache flush
+  foreach {x y z} [sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 1] break
+  expr {$x==0 && $y==0 && $z<18}
+} {1}
+do_test lookaside-1.9 {
+  db cache flush
+  sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 0
+} {0 0 0}
+
+do_test lookaside-2.1 {
+  sqlite3_db_config_lookaside db 0 100 1000
+} {0}
+do_test lookaside-2.2 {
+  db eval {CREATE TABLE t2(x);}
+  foreach {x y z} [sqlite3_db_status db DBSTATUS_LOOKASIDE_USED 0] break
+  expr {$x==0 && $y<$z && $z>10 && $z<100}
+} {1}
+do_test lookaside-2.3 {
+  db eval {SELECT 1}
+  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
+do_test lookaside-2.5 {
+  sqlite3_db_config_lookaside db 0 -1 50
+} {0}  ;# SQLITE_OK
+do_test lookaside-2.6 {
+  sqlite3_db_config_lookaside db 0 50 -1
+} {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
+autoinstall_test_functions
+
+test_restore_config_pagecache
+finish_test