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# 2012 October 13

# 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.

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

# The tests in this file verify that if an empty database (zero bytes in

# size) is used as the source of a backup operation, the final destination

# database is one page in size.

# The destination must consist of at least one page as truncating a

# database file to zero bytes is equivalent to resetting the database

# schema cookie and change counter. Doing that could cause other clients

# to become confused and continue using out-of-date cache data.

set testdir [file dirname $argv0]

source $testdir/tester.tcl

set testprefix backup4

# The codec logic does not work for zero-length database files. A database

# file must contain at least one page in order to be recognized as an

# encrypted database.

do_not_use_codec

#-------------------------------------------------------------------------

# At one point this test was failing because [db] was using an out of

# date schema in test case 1.2.

do_execsql_test 1.0 {

CREATE TABLE t1(x, y, UNIQUE(x, y));

INSERT INTO t1 VALUES('one', 'two');

SELECT * FROM t1 WHERE x='one';

PRAGMA integrity_check;

} {one two ok}

do_test 1.1 {

sqlite3 db1 :memory:

db1 backup test.db

sqlite3 db1 test.db

db1 eval {

CREATE TABLE t1(x, y);

INSERT INTO t1 VALUES('one', 'two');

}

db1 close

} {}

do_execsql_test 1.2 {

SELECT * FROM t1 WHERE x='one';

PRAGMA integrity_check;

} {one two ok}

db close

forcedelete test.db

forcedelete test.db2

sqlite3 db test.db

#-------------------------------------------------------------------------

# Test that if the source is zero bytes, the destination database

# consists of a single page only.

do_execsql_test 2.1 {

CREATE TABLE t1(a, b);

CREATE INDEX i1 ON t1(a, b);

}

do_test 2.2 { file size test.db } [expr $AUTOVACUUM ? 4096 : 3072]

do_test 2.3 {

sqlite3 db1 test.db2

db1 backup test.db

db1 close

file size test.db

} {1024}

do_test 2.4 { file size test.db2 } 0

db close

forcedelete test.db

forcedelete test.db2

sqlite3 db test.db

#-------------------------------------------------------------------------

# Test that if the destination has a page-size larger than the implicit

# page-size of the source, the final destination database still consists

# of a single page.

do_execsql_test 3.1 {

PRAGMA page_size = 4096;

CREATE TABLE t1(a, b);

CREATE INDEX i1 ON t1(a, b);

}

do_test 3.2 { file size test.db } [expr $AUTOVACUUM ? 16384 : 12288]

do_test 3.3 {

sqlite3 db1 test.db2

db1 backup test.db

db1 close

file size test.db

} {1024}

do_test 3.4 { file size test.db2 } 0

finish_test