Import SQLite 3.7.6.3.

third_party/sqlite/src/test/walnoshm.test

Index: third_party/sqlite/src/test/walnoshm.test
diff --git a/third_party/sqlite/src/test/walnoshm.test b/third_party/sqlite/src/test/walnoshm.test
new file mode 100644
index 0000000000000000000000000000000000000000..de059dd5ca642d884c701fc1c5fd775bf34e29c5
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+++ b/third_party/sqlite/src/test/walnoshm.test
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+# 2010 November 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.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this file is testing that WAL databases may be accessed without
+# using the xShm primitives if the connection is in exclusive-mode.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix walnoshm
+ifcapable !wal {finish_test ; return }
+
+db close
+testvfs tvfsshm
+testvfs tvfs -default 1 -iversion 1 
+sqlite3 db test.db
+
+#--------------------------------------------------------------------------
+# Test that when using a version 1 VFS, a database can only be converted
+# to WAL mode after setting locking_mode=EXCLUSIVE. Also, test that if a
+# WAL database is opened using heap-memory for the WAL index, the connection
+# cannot change back to locking_mode=NORMAL while the database is still in
+# WAL mode.
+#
+do_execsql_test 1.1 {
+  CREATE TABLE t1(x, y);
+  INSERT INTO t1 VALUES(1, 2);
+}
+
+do_execsql_test 1.2 { 
+  PRAGMA journal_mode = WAL;
+  SELECT * FROM t1;
+} {delete 1 2}
+do_test 1.3 { file exists test.db-wal } {0}
+
+do_execsql_test 1.4 { 
+  PRAGMA locking_mode = exclusive;
+  PRAGMA journal_mode = WAL;
+  SELECT * FROM t1;
+} {exclusive wal 1 2}
+do_test 1.5 { file exists test.db-wal } {1}
+
+do_execsql_test 1.6 { INSERT INTO t1 VALUES(3, 4) }
+
+do_execsql_test 1.7 {
+  PRAGMA locking_mode = normal;
+} {exclusive}
+do_execsql_test 1.8 {
+  PRAGMA journal_mode = delete;
+  PRAGMA main.locking_mode;
+} {delete exclusive}
+do_execsql_test 1.9 {
+  PRAGMA locking_mode = normal;
+} {normal}
+do_execsql_test 1.10 {
+  SELECT * FROM t1;
+} {1 2 3 4}
+do_test 1.11 { file exists test.db-wal } {0}
+
+#-------------------------------------------------------------------------
+#
+# 2.1.*: Test that a connection using a version 1 VFS can open a WAL database
+#        and convert it to rollback mode if it is set to use
+#        locking_mode=exclusive.
+#
+# 2.2.*: Test that if the exclusive lock cannot be obtained while attempting
+#        the above, the operation fails and the WAL file is not opened.
+#
+do_execsql_test 2.1.1 {
+  CREATE TABLE t2(x, y);
+  INSERT INTO t2 VALUES('a', 'b');
+  INSERT INTO t2 VALUES('c', 'd');
+}
+do_execsql_test 2.1.2 {
+  PRAGMA locking_mode = exclusive;
+  PRAGMA journal_mode = WAL;
+  INSERT INTO t2 VALUES('e', 'f');
+  INSERT INTO t2 VALUES('g', 'h');
+} {exclusive wal}
+
+do_test 2.1.3 {
+  file copy -force test.db     test2.db
+  file copy -force test.db-wal test2.db-wal
+  sqlite3 db2 test2.db
+  catchsql { SELECT * FROM t2 } db2
+} {1 {unable to open database file}}
+do_test 2.1.4 {
+  catchsql { PRAGMA journal_mode = delete } db2
+} {1 {unable to open database file}}
+do_test 2.1.5 {
+  execsql { 
+    PRAGMA locking_mode = exclusive; 
+    PRAGMA journal_mode = delete;
+    SELECT * FROM t2;
+  } db2
+} {exclusive delete a b c d e f g h}
+
+do_test 2.2.1 {
+  file copy -force test.db     test2.db
+  file copy -force test.db-wal test2.db-wal
+  sqlite3 db3 test2.db -vfs tvfsshm
+  sqlite3 db2 test2.db
+  execsql { SELECT * FROM t2 } db3
+} {a b c d e f g h}
+
+do_test 2.2.2 {
+  execsql  { PRAGMA locking_mode = exclusive }  db2
+  catchsql { PRAGMA journal_mode = delete } db2
+} {1 {database is locked}}
+
+do_test 2.2.3 {
+  # This is to test that [db2] is not holding a PENDING lock (which can 
+  # happen when an attempt to obtain an EXCLUSIVE lock fails).
+  sqlite3 db4 test2.db -vfs tvfsshm
+  execsql { SELECT * FROM t2 } db4
+} {a b c d e f g h}
+
+do_test 2.2.4 {
+  catchsql { SELECT * FROM t2 } db2
+} {1 {database is locked}}
+
+do_test 2.2.5 {
+  db4 close
+  sqlite3 db4 test2.db -vfs tvfsshm
+  execsql { SELECT * FROM t2 } db4
+} {a b c d e f g h}
+
+do_test 2.2.6 {
+  db3 close
+  db4 close
+  execsql { SELECT * FROM t2 } db2
+} {a b c d e f g h}
+
+db2 close
+db close
+
+#-------------------------------------------------------------------------
+#
+# 3.1: Test that if locking_mode=EXCLUSIVE is set after the wal file is
+#      opened, it is possible to drop back to locking_mode=NORMAL.
+#
+# 3.2: Test that if locking_mode=EXCLUSIVE is set before the wal file is
+#      opened, it is not.
+#
+do_test 3.1 {
+  sqlite3 db test.db -vfs tvfsshm
+  execsql { 
+    SELECT * FROM t1;
+    PRAGMA locking_mode = EXCLUSIVE;
+    INSERT INTO t1 VALUES(5, 6);
+    PRAGMA locking_mode = NORMAL;
+    INSERT INTO t1 VALUES(7, 8);
+  }
+  sqlite3 db2 test.db -vfs tvfsshm
+  execsql { SELECT * FROM t1 } db2
+} {1 2 3 4 5 6 7 8}
+db close
+db2 close
+do_test 3.2 {
+  sqlite3 db  test.db -vfs tvfsshm
+  execsql { 
+    PRAGMA locking_mode = EXCLUSIVE;
+    INSERT INTO t1 VALUES(9, 10);
+    PRAGMA locking_mode = NORMAL;
+    INSERT INTO t1 VALUES(11, 12);
+  }
+  sqlite3 db2 test.db -vfs tvfsshm
+  catchsql { SELECT * FROM t1 } db2
+} {1 {database is locked}}
+db close
+db2 close
+
+tvfs delete
+tvfsshm delete
+
+finish_test