Import SQLite 3.7.6.3.

third_party/sqlite/src/test/wal4.test

+# 2010 July 1
+#
+# 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.
+#
+#***********************************************************************
+# Verify that an empty database and a non-empty WAL file do not
+# result in database corruption
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+source $testdir/malloc_common.tcl
+ifcapable !wal {finish_test ; return }
+
+do_test wal4-1.1 {
+  execsql {
+    PRAGMA journal_mode=WAL;
+    CREATE TABLE t1(x);
+    INSERT INTO t1 VALUES(1);
+    INSERT INTO t1 VALUES(2);
+    SELECT x FROM t1 ORDER BY x;
+  }
+} {wal 1 2}
+
+do_test wal4-1.2 {
+  # Save a copy of the file-system containing the wal and wal-index files 
+  # only (no database file).
+  faultsim_save_and_close
+  file delete -force sv_test.db
+} {}
+
+do_test wal4-1.3 {
+  faultsim_restore_and_reopen
+  catchsql { SELECT * FROM t1 }
+} {1 {no such table: t1}}
+
+do_faultsim_test wal4-2 -prep {
+  faultsim_restore_and_reopen
+} -body {
+  execsql { SELECT name FROM sqlite_master }
+} -test {
+  # Result should be zero rows (empty db file).
+  #
+  faultsim_test_result {0 {}}
+
+  # If the SELECT finished successfully, the WAL file should have been
+  # deleted. In no case should the database file have been written, so
+  # it should still be zero bytes in size regardless of whether or not
+  # a fault was injected. Test these assertions:
+  #
+  if { $testrc==0 && [file exists test.db-wal] } { 
+    error "Wal file was not deleted"
+  }
+  if { [file size test.db]!=0 } { 
+    error "Db file grew to [file size test.db] bytes"
+  }
+}
+
+finish_test