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+# 2007 June 26
+#
+# 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 the ALTER TABLE ... RENAME TO
+# command on virtual tables.
+#
+# $Id: vtab_alter.test,v 1.3 2007/12/13 21:54:11 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+ifcapable !vtab||!altertable {
+  finish_test
+  return
+}
+
+# Register the echo module.
+#
+# This test uses a special feature of the echo module. If the name
+# of the virtual table is a prefix of the name of the underlying
+# real table (for example if the v-table is "tbl" and the real table
+# is "tbl_base"), then the name of the real table is modified
+# when an "ALTER TABLE ... RENAME TO" is executed on the v-table.
+# For example:
+#
+#   sqlite> CREATE TABLE t1_base(a, b, c); 
+#   sqlite> CREATE VIRTUAL TABLE t1 USING(t1_base);
+#   sqlite> ALTER TABLE t1 RENAME TO t2;
+#   sqlite> SELECT tbl_name FROM sqlite_master;
+#   t2_base
+#   t2
+#
+register_echo_module [sqlite3_connection_pointer db]
+
+
+# Try to rename an echo table. Make sure nothing terrible happens.
+#
+do_test vtab_alter-1.1 {
+  execsql { CREATE TABLE t1(a, b VARCHAR, c INTEGER) }
+} {}
+do_test vtab_alter-1.2 {
+  execsql { CREATE VIRTUAL TABLE t1echo USING echo(t1) }
+} {}
+do_test vtab_alter-1.3 {
+  catchsql { SELECT * FROM t1echo }
+} {0 {}}
+do_test vtab_alter-1.4 {
+  execsql { ALTER TABLE t1echo RENAME TO new }
+} {}
+do_test vtab_alter-1.5 {
+  catchsql { SELECT * FROM t1echo }
+} {1 {no such table: t1echo}}
+do_test vtab_alter-1.6 {
+  catchsql { SELECT * FROM new }
+} {0 {}}
+
+# Try to rename an echo table that renames its base table. Make 
+# sure nothing terrible happens.
+#
+do_test vtab_alter-2.1 {
+  execsql { 
+    DROP TABLE new;
+    DROP TABLE t1;
+    CREATE TABLE t1_base(a, b, c);
+    CREATE VIRTUAL TABLE t1 USING echo('*_base');
+  }
+} {}
+do_test vtab_alter-2.2 {
+  execsql { 
+    INSERT INTO t1_base VALUES(1, 2, 3);
+    SELECT * FROM t1;
+  }
+} {1 2 3}
+do_test vtab_alter-2.3 {
+  execsql { ALTER TABLE t1 RENAME TO x }
+} {}
+do_test vtab_alter-2.4 {
+  execsql { SELECT * FROM x; }
+} {1 2 3}
+do_test vtab_alter-2.5 {
+  execsql { SELECT * FROM x_base; }
+} {1 2 3}
+
+# Cause an error to occur when the echo module renames its
+# backing store table.
+#
+do_test vtab_alter-3.1 {
+  execsql  { CREATE TABLE y_base(a, b, c) }
+  catchsql { ALTER TABLE x RENAME TO y }
+} {1 {SQL logic error or missing database}}
+do_test vtab_alter-3.2 {
+  execsql  { SELECT * FROM x }
+} {1 2 3}
+
+finish_test