[sql] Remove SQLite 3.10.2 reference directory.

third_party/sqlite/sqlite-src-3100200/test/e_walckpt.test

Index: third_party/sqlite/sqlite-src-3100200/test/e_walckpt.test
diff --git a/third_party/sqlite/sqlite-src-3100200/test/e_walckpt.test b/third_party/sqlite/sqlite-src-3100200/test/e_walckpt.test
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--- a/third_party/sqlite/sqlite-src-3100200/test/e_walckpt.test
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@@ -1,754 +0,0 @@
-# 2014 December 04
-#
-# 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.
-#
-#***********************************************************************
-#
-
-set testdir [file dirname $argv0]
-source $testdir/tester.tcl
-source $testdir/lock_common.tcl
-source $testdir/wal_common.tcl
-set testprefix e_walckpt
-
-# The following two commands are used to determine if any of the files
-# "test.db", "test.db2" and "test.db3" are modified by a test case.
-#
-# The [save_db_hashes] command saves a hash of the current contents of
-# all three files in global variables. The [compare_db_hashes] compares
-# the current contents with the saved hashes and returns a list of the
-# files that have changed.
-#
-proc save_db_hashes {} {
-  global H
-  foreach f {test.db test.db2 test.db3} {
-    set H($f) 0
-    catch { set H($f) [md5file $f] }
-  }
-}
-proc compare_db_hashes {} {
-  global H
-  set ret [list]
-  foreach f {test.db test.db2 test.db3} {
-    set expect 0
-    catch { set expect [md5file $f] }
-    if {$H($f) != $expect} { lappend ret $f }
-  }
-  set ret
-}
-
-#-------------------------------------------------------------------------
-# All calls to the [sqlite3_wal_checkpoint_v2] command made within this
-# file use this wrapper. It's sole purpose is to throw an error if the
-# following requirement is violated:
-#
-# EVIDENCE-OF: R-60567-47780 Unless it returns SQLITE_MISUSE, the
-# sqlite3_wal_checkpoint_v2() interface sets the error information that
-# is queried by sqlite3_errcode() and sqlite3_errmsg().
-#
-proc wal_checkpoint_v2 {db args} {
-  set rc [catch {
-    uplevel sqlite3_wal_checkpoint_v2 $db $args
-  } msg]
-
-  set errcode "SQLITE_OK"
-  if {$rc} {
-    set errcode [lindex [split $msg " "] 0]
-  } elseif { [lindex $msg 0] } {
-    set errcode "SQLITE_BUSY"
-  }
-
-  if {$errcode != "SQLITE_MISUSE" && [sqlite3_errcode $db] != $errcode} {
-    error "sqlite3_errcode mismatch! (1) $errcode!=[sqlite3_errcode $db]"
-  }
-
-  if {$rc==0} {
-    return $msg
-  } else {
-    error $msg
-  }
-}
-
-
-# The following tests are run 3 times, each using a different method of 
-# invoking a checkpoint:
-#
-#   1) Using sqlite3_wal_checkpoint_v2()
-#   2) Using "PRAGMA wal_checkpoint"
-#   3) Using sqlite3_wal_checkpoint() in place of checkpoint_v2(PASSIVE)
-#
-# Cases (2) and (3) are to show that the following statements are 
-# correct, respectively:
-#
-# EVIDENCE-OF: R-36706-10507 The PRAGMA wal_checkpoint command can be
-# used to invoke this interface from SQL.
-#
-# EVIDENCE-OF: R-41613-20553 The sqlite3_wal_checkpoint(D,X) is
-# equivalent to
-# sqlite3_wal_checkpoint_v2(D,X,SQLITE_CHECKPOINT_PASSIVE,0,0).
-# 
-foreach {tn script} {
-  1 {
-    proc checkpoint {db mode args} {
-      eval wal_checkpoint_v2 [list $db] [list $mode] $args
-    }
-  }
-
-  2 {
-    proc checkpoint {db mode args} {
-      set sql "PRAGMA wal_checkpoint = $mode"
-      if {[llength $args] && [lindex $args 0]!=""} {
-        set sql "PRAGMA [lindex $args 0].wal_checkpoint = $mode"
-      }
-      set rc [catch { $db eval $sql } msg]
-      if {$rc} {
-        regsub {database} $msg {database:} msg
-        error "[sqlite3_errcode $db] - $msg"
-      }
-      set msg
-    }
-  }
-
-  3 {
-    proc checkpoint {db mode args} {
-      if {$mode == "passive"} {
-        set rc [eval sqlite3_wal_checkpoint [list $db] $args]
-        if {$rc != "SQLITE_OK"} {
-          error "$rc - [sqlite3_errmsg $db]"
-        }
-      } else {
-        eval wal_checkpoint_v2 [list $db] [list $mode] $args
-      }
-    }
-  }
-
-} {
-
-  eval $script
-
-  reset_db
-  forcedelete test.db2 test.db3 test.db4
-  execsql {
-    ATTACH 'test.db2' AS aux;
-    ATTACH 'test.db3' AS aux2;
-    ATTACH 'test.db4' AS aux3;
-    CREATE TABLE t1(x);
-    CREATE TABLE aux.t2(x);
-    CREATE TABLE aux2.t3(x);
-    CREATE TABLE aux3.t4(x);
-    PRAGMA main.journal_mode = WAL;
-    PRAGMA aux.journal_mode = WAL;
-    PRAGMA aux2.journal_mode = WAL;
-    /* Leave aux4 in rollback mode */
-  }
-
-  # EVIDENCE-OF: R-49787-09095 The sqlite3_wal_checkpoint_v2(D,X,M,L,C)
-  # interface runs a checkpoint operation on database X of database
-  # connection D in mode M. Status information is written back into
-  # integers pointed to by L and C.
-  #
-  #     Tests 1, 2 and 3 below verify the "on database X" part of the
-  #     above. Other parts of this requirement are tested below.
-  #
-  # EVIDENCE-OF: R-00653-06026 If parameter zDb is NULL or points to a
-  # zero length string, then the specified operation is attempted on all
-  # WAL databases attached to database connection db.
-  #
-  #     Tests 4 and 5 below test this.
-  #
-  foreach {tn2 zDb dblist} {
-    1 main  test.db
-    2 aux   test.db2
-    3 aux2  test.db3
-    4 ""    {test.db test.db2 test.db3}
-    5 -     {test.db test.db2 test.db3}
-    6 temp  {}
-  } {
-    do_test $tn.1.$tn2 {
-      execsql {
-        INSERT INTO t1 VALUES(1);
-        INSERT INTO t2 VALUES(2);
-        INSERT INTO t3 VALUES(3);
-      }
-      save_db_hashes
-
-      if {$zDb == "-"} {
-        checkpoint db passive
-      } else {
-        checkpoint db passive $zDb
-      }
-
-      compare_db_hashes
-    } $dblist
-  }
-
-  # EVIDENCE-OF: R-38207-48996 If zDb is not NULL (or a zero length
-  # string) and is not the name of any attached database, SQLITE_ERROR is
-  # returned to the caller.
-  do_test $tn.2.1 {
-    list [catch { checkpoint db passive notadb } msg] $msg
-  } {1 {SQLITE_ERROR - unknown database: notadb}}
-
-  # EVIDENCE-OF: R-14303-42483 If database zDb is the name of an attached
-  # database that is not in WAL mode, SQLITE_OK is returned and both
-  # *pnLog and *pnCkpt set to -1.
-  #
-  if {$tn==3} {
-    # With sqlite3_wal_checkpoint() the two output variables cannot be 
-    # tested. So just test that no error is returned when attempting to
-    # checkpoint a db in rollback mode.
-    do_test $tn.2.2.a { checkpoint db passive aux3 } {}
-  } else {
-    do_test $tn.2.2.b { checkpoint db passive aux3 } {0 -1 -1}
-  }
-
-  # EVIDENCE-OF: R-62028-47212 All calls obtain an exclusive "checkpoint"
-  # lock on the database file.
-  db close
-  testvfs tvfs
-  tvfs filter xShmLock
-  tvfs script filelock
-  proc filelock {method file handle details} {
-    # Test for an exclusive checkpoint lock. A checkpoint lock locks a
-    # single byte starting at offset 1.
-    if {$details == "1 1 lock exclusive"} { set ::seen_checkpoint_lock 1 }
-  }
-  sqlite3 db test.db -vfs tvfs
-  do_test $tn.3.1 {
-    execsql { INSERT INTO t1 VALUES('xyz') }
-    unset -nocomplain ::seen_checkpoint_lock
-    checkpoint db passive
-    set ::seen_checkpoint_lock
-  } {1}
-  db close
-  tvfs delete
-  reset_db
-
-
- 
-
-  #-----------------------------------------------------------------------
-  # EVIDENCE-OF: R-10421-19736 If any other process is running a
-  # checkpoint operation at the same time, the lock cannot be obtained and
-  # SQLITE_BUSY is returned.
-  #
-  # EVIDENCE-OF: R-53820-33897 Even if there is a busy-handler configured,
-  # it will not be invoked in this case.
-  #
-  testvfs tvfs
-  tvfs filter xWrite
-  sqlite3 db test.db -vfs tvfs
-  sqlite3 db2 test.db -vfs tvfs
-
-  do_test $tn.3.2.1 {
-    db2 eval {
-      PRAGMA auto_vacuum = 0;
-      PRAGMA journal_mode = WAL;
-      CREATE TABLE t1(x, y);
-      INSERT INTO t1 VALUES(1,2);
-      INSERT INTO t1 VALUES(3,4);
-      INSERT INTO t1 VALUES(5,6);
-    }
-    file size test.db-wal
-  } [wal_file_size 5 1024]
-
-
-  # Connection [db] runs a checkpoint. During this checkpoint, each
-  # time it calls xWrite() to write a page into the database file, we
-  # attempt to start a checkpoint using [db2]. According to the 
-  # first requirement being tested, this should return SQLITE_BUSY. According
-  # to the second, the busy-handler belonging to [db2] should not be
-  # invoked.
-  #
-  set ::write_count 0
-  set ::write_errors [list]
-  proc busy_callback {args} {
-    lappend ::write_errors "busy handler called!"
-  }
-  proc write_callback {args} {
-    set rc [catch {checkpoint db2 passive} msg]
-    if {0==[regexp "database is locked" $msg] && $msg!="1 -1 -1"} {
-      lappend ::write_errors "$rc $msg"
-    } 
-    incr ::write_count
-  }
-  db2 busy busy_callback
-  tvfs script write_callback
-
-  do_test $tn.3.2.2 {
-    db eval {SELECT * FROM sqlite_master}
-    checkpoint db full
-    set ::write_count
-  } {2}
-
-  do_test $tn.3.2.3 {
-    set ::write_errors
-  } {}
-
-  db close
-  db2 close
-  tvfs delete
-
-  proc busy_handler {mode busy_handler_mode n} {
-    incr ::busy_handler_counter
-    switch -- $busy_handler_mode {
-      1 {
-        # Do nothing. Do not block.
-        return 1
-      }
-
-      2 {
-        # Close first the reader, then later the writer. Give up before
-        # closing the [db6] reader.
-        if {$n==5}  { catch {db2 eval commit} }
-        if {$n==10} { catch {db3 eval commit} }
-        if {$n==15} { return 1 }
-        return 0
-      }
-
-      3 {
-        # Close first the writer, then later the reader. And finally the 
-        # [db6] reader.
-        if {$n==5}  { catch {db2 eval commit} }
-        if {$n==10} { catch {db3 eval commit} }
-        if {$n==15} { catch {db6 eval commit} }
-        return 0
-      }
-    }
-  }
-
-  foreach {mode busy_handler_mode} { 
-    passive  1
-    full     1       full     2       full    3
-    restart  1       restart  2       restart  3
-    truncate 1       truncate 2       truncate 3
-  } {
-    set tp "$tn.$mode.$busy_handler_mode"
-
-    set ::sync_counter 0
-
-    # Set up a callback function for xSync and xWrite calls made during
-    # the checkpoint.
-    #
-    set ::checkpoint_ongoing 0
-    proc tvfs_callback {method args} {
-      if {$::checkpoint_ongoing==0} return
-
-      set tail [file tail [lindex $args 0]]
-      if {$method == "xSync" && $tail == "test.db"} {
-        incr ::sync_counter
-      }
-      if {$method == "xWrite" && $tail=="test.db"} {
-        if {$::write_ok < 0} {
-          set ::write_ok [expr ![catch {db5 eval { BEGIN IMMEDIATE }}]]
-          catch { db5 eval ROLLBACK }
-        }
-        if {$::read_ok < 0} {
-          set ::read_ok [expr ![catch {db5 eval { SELECT * FROM t1 }}]]
-        }
-
-        # If one has not already been opened, open a read-transaction using
-        # connection [db6]
-        catch { db6 eval { BEGIN ; SELECT * FROM sqlite_master } } msg
-      }
-      if {$method == "xShmLock" } {
-        set details [lindex $args 2]
-        if {$details == "0 1 lock exclusive"} { set ::seen_writer_lock 1 }
-      }
-    }
-
-    catch { db close }
-    forcedelete test.db
-    testvfs tvfs
-    sqlite3 db test.db -vfs tvfs
-    #tvfs filter xSync
-    tvfs script tvfs_callback
-
-    do_execsql_test $tp.0 {
-      CREATE TABLE t1(a, b);
-      CREATE TABLE t2(a, b);
-      PRAGMA journal_mode = wal;
-      INSERT INTO t1 VALUES(1, 2);
-      INSERT INTO t1 VALUES(3, 4);
-      INSERT INTO t1 VALUES(5, 6);
-    } {wal}
-
-    # Open a reader on the current database snapshot.
-    do_test $tp.1 {
-      sqlite3 db2 test.db -vfs tvfs
-      execsql {
-        BEGIN;
-          SELECT * FROM t1 UNION ALL SELECT * FROM t2;
-      } db2
-    } {1 2 3 4 5 6}
-
-    # Open a writer. Write a transaction. Then begin, but do not commit,
-    # a second transaction.
-    do_test $tp.2 {
-      sqlite3 db3 test.db -vfs tvfs
-      execsql {
-        INSERT INTO t2 VALUES(7, 8);
-        BEGIN;
-          INSERT INTO t2 VALUES(9, 10);
-          SELECT * FROM t1 UNION ALL SELECT * FROM t2;
-      } db3
-    } {1 2 3 4 5 6 7 8 9 10}
-
-    sqlite3 db5 test.db -vfs tvfs
-    sqlite3 db6 test.db -vfs tvfs
-
-    # Register a busy-handler with connection [db].
-    #
-    db busy [list busy_handler $mode $busy_handler_mode]
-    set ::sync_counter 0
-    set ::busy_handler_counter 0
-    set ::read_ok -1
-    set ::write_ok -1
-    set ::seen_writer_lock 0
-    
-    set ::checkpoint_ongoing 1
-    do_test $tp.3 {
-      checkpoint db $mode main
-      set {} {}
-    } {}
-    set ::checkpoint_ongoing 0
-    set ::did_restart_blocking [expr {[catch {db6 eval commit}]}]
-
-    if { $mode=="passive" } {
-      # EVIDENCE-OF: R-16333-64433 Checkpoint as many frames as possible
-      # without waiting for any database readers or writers to finish, then
-      # sync the database file if all frames in the log were checkpointed.
-      #
-      #   "As many frames as possible" means all but the last two transactions
-      #   (the two that write to table t2, of which the scond is unfinished).
-      #   So copying the db file only we see the t1 change, but not the t2
-      #   modifications.
-      #
-      #   The busy handler is not invoked (see below) and the db reader and
-      #   writer are still active - so the checkpointer did not wait for either
-      #   readers or writers. As a result the checkpoint was not finished and
-      #   so the db file is not synced.
-      #
-      # EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
-      # in the SQLITE_CHECKPOINT_PASSIVE mode.
-      #
-      #   It's not. Test case "$tp.6".
-      #
-      do_test $tp.4 {
-        forcecopy test.db abc.db
-        sqlite3 db4 abc.db
-        db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
-      } {1 2 3 4 5 6}
-      do_test $tp.5 { set ::sync_counter } 0
-      do_test $tp.6 { set ::busy_handler_counter } 0
-      db4 close
-  
-      db2 eval COMMIT
-      db3 eval COMMIT
-  
-      # EVIDENCE-OF: R-65499-53765 On the other hand, passive mode might leave
-      # the checkpoint unfinished if there are concurrent readers or writers.
-      #
-      #   The reader and writer have now dropped their locks. And so a 
-      #   checkpoint now is able to checkpoint more frames. Showing that the
-      #   attempt above was left "unfinished".
-      #
-      #   Also, because the checkpoint finishes this time, the db is synced.
-      #   Which is part of R-16333-64433 above.
-      #
-      set ::checkpoint_ongoing 1
-      do_test $tp.7 {
-        checkpoint db $mode main
-        forcecopy test.db abc.db
-        sqlite3 db4 abc.db
-        db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
-      } {1 2 3 4 5 6 7 8 9 10}
-      set ::checkpoint_ongoing 0
-      do_test $tp.7 { set ::sync_counter } 1
-      do_test $tp.8 { set ::busy_handler_counter } 0
-      db4 close
-    }
-
-    if { $mode=="full" || $mode=="restart" || $mode=="truncate" } {
-
-      # EVIDENCE-OF: R-59782-36818 The SQLITE_CHECKPOINT_FULL, RESTART and
-      # TRUNCATE modes also obtain the exclusive "writer" lock on the 
-      # database file.
-      #
-      #   Or at least attempts to obtain.
-      #
-      do_test $tp.9 {
-        set ::seen_writer_lock
-      } {1}
-
-      if {$busy_handler_mode==2 || $busy_handler_mode==3} {
-        # EVIDENCE-OF: R-59171-47567 This mode blocks (it invokes the
-        # busy-handler callback) until there is no database writer and all
-        # readers are reading from the most recent database snapshot.
-        #
-        #   The test below shows that both the reader and writer have 
-        #   finished:
-        #
-        #   Also restated by the following two. That both busy_handler_mode
-        #   values 2 and 3 work show that both of the following are true - as
-        #   they release the reader and writer transactions in different
-        #   orders.
-        #
-        # EVIDENCE-OF: R-60642-04082 If the writer lock cannot be obtained
-        # immediately, and a busy-handler is configured, it is invoked and the
-        # writer lock retried until either the busy-handler returns 0 or the
-        # lock is successfully obtained.
-        #
-        # EVIDENCE-OF: R-48107-00250 The busy-handler is also invoked while
-        # waiting for database readers as described above.
-        #
-        do_test $tp.7 {
-          list [catchsql COMMIT db2] [catchsql COMMIT db3]
-        } [list                                             \
-            {1 {cannot commit - no transaction is active}}  \
-            {1 {cannot commit - no transaction is active}}  \
-        ]
-
-        # EVIDENCE-OF: R-29177-48281 It then checkpoints all frames in the log
-        # file and syncs the database file.
-        #
-        do_test $tp.8 {
-          forcecopy test.db abc.db
-          sqlite3 db4 abc.db
-          db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
-        } {1 2 3 4 5 6 7 8 9 10}
-        do_test $tp.9 { set ::sync_counter } 1
-        db4 close
-
-        # EVIDENCE-OF: R-51867-44713 This mode blocks new database writers
-        # while it is pending, but new database readers are allowed to continue
-        # unimpeded.
-        #
-        # EVIDENCE-OF: R-47276-58266 Like SQLITE_CHECKPOINT_FULL, this mode
-        # blocks new database writer attempts while it is pending, but does not
-        # impede readers.
-        #
-        #   The first of the above two refers to "full" mode. The second
-        #   to "restart".
-        #
-        do_test $tp.10.1 {
-          list $::write_ok $::read_ok
-        } {0 1}
-
-        # EVIDENCE-OF: R-12410-31217 This mode works the same way as
-        # SQLITE_CHECKPOINT_FULL with the addition that after checkpointing the
-        # log file it blocks (calls the busy-handler callback) until all
-        # readers are reading from the database file only.
-        #
-        #     The stuff above passed, so the first part of this requirement
-        #     is met. The second part is tested below. If the checkpoint mode
-        #     was "restart" or "truncate", then the busy-handler will have
-        #     been called to block on wal-file readers.
-        #
-        do_test $tp.11 {
-          set ::did_restart_blocking
-        } [expr {($mode=="restart"||$mode=="truncate")&&$busy_handler_mode==3}]
-
-        # EVIDENCE-OF: R-44699-57140 This mode works the same way as
-        # SQLITE_CHECKPOINT_RESTART with the addition that it also truncates
-        # the log file to zero bytes just prior to a successful return.
-        if {$mode=="truncate" && $busy_handler_mode==3} {
-          do_test $tp.12 {
-            file size test.db-wal
-          } 0
-        }
-      } elseif {$busy_handler_mode==1} {
-
-        # EVIDENCE-OF: R-34519-06271 SQLITE_BUSY is returned in this case.
-        if {$tn!=2} {
-          # ($tn==2) is the loop that uses "PRAGMA wal_checkpoint"
-          do_test $tp.13 { sqlite3_errcode db } {SQLITE_BUSY}
-        }
-
-        # EVIDENCE-OF: R-49155-63541 If the busy-handler returns 0 before the
-        # writer lock is obtained or while waiting for database readers, the
-        # checkpoint operation proceeds from that point in the same way as
-        # SQLITE_CHECKPOINT_PASSIVE - checkpointing as many frames as possible
-        # without blocking any further.
-        do_test $tp.14 {
-          forcecopy test.db abc.db
-            sqlite3 db4 abc.db
-            db4 eval { SELECT * FROM t1 UNION ALL SELECT * FROM t2 }
-        } {1 2 3 4 5 6}
-        do_test $tp.15 { set ::sync_counter } 0
-        do_test $tp.16 { set ::busy_handler_counter } 1
-        db4 close
-      }
-    }
-
-    db2 close
-    db3 close
-    db5 close
-    db6 close
-  }
-
-  db close
-  tvfs delete
-}
-
-#-----------------------------------------------------------------------
-# EVIDENCE-OF: R-03996-12088 The M parameter must be a valid checkpoint
-# mode:
-#
-#   Valid checkpoint modes are 0, 1, 2 and 3.
-#
-sqlite3 db test.db
-foreach {tn mode res} {
-  0 -1001    {1 {SQLITE_MISUSE - not an error}}
-  1 -1       {1 {SQLITE_MISUSE - not an error}}
-  2  0       {0 {0 -1 -1}}
-  3  1       {0 {0 -1 -1}}
-  4  2       {0 {0 -1 -1}}
-  5  3       {0 {0 -1 -1}}
-  6  4       {1 {SQLITE_MISUSE - not an error}}
-  7  114     {1 {SQLITE_MISUSE - not an error}}
-  8  1000000 {1 {SQLITE_MISUSE - not an error}}
-} {
-  do_test 4.$tn {
-    list [catch "wal_checkpoint_v2 db $mode" msg] $msg
-  } $res
-}
-db close
-
-foreach tn {1 2 3} {
-  forcedelete test.db test.db2 test.db3
-  testvfs tvfs
-
-  sqlite3 db test.db -vfs tvfs
-  execsql {
-    ATTACH 'test.db2' AS aux2;
-    ATTACH 'test.db3' AS aux3;
-    PRAGMA main.journal_mode = WAL;
-    PRAGMA aux2.journal_mode = WAL;
-    PRAGMA aux3.journal_mode = WAL;
-
-    CREATE TABLE main.t1(x,y);
-    CREATE TABLE aux2.t2(x,y);
-    CREATE TABLE aux3.t3(x,y);
-
-    INSERT INTO t1 VALUES('a', 'b');
-    INSERT INTO t2 VALUES('a', 'b');
-    INSERT INTO t3 VALUES('a', 'b');
-  }
-  sqlite3 db2 test.db2 -vfs tvfs
-
-  switch -- $tn {
-    1 {
-      # EVIDENCE-OF: R-41299-52117 If no error (SQLITE_BUSY or otherwise) is
-      # encountered while processing the attached databases, SQLITE_OK is
-      # returned.
-      do_test 5.$tn.1 {
-        lindex [wal_checkpoint_v2 db truncate] 0
-      } {0}    ;# 0 -> SQLITE_OK
-      do_test 5.$tn.2 {
-        list [expr [file size test.db-wal]==0]  \
-             [expr [file size test.db2-wal]==0] \
-             [expr [file size test.db3-wal]==0]
-      } {1 1 1}
-    }
-
-    2 {
-      # EVIDENCE-OF: R-38578-34175 If an SQLITE_BUSY error is encountered when
-      # processing one or more of the attached WAL databases, the operation is
-      # still attempted on any remaining attached databases and SQLITE_BUSY is
-      # returned at the end.
-      db2 eval { BEGIN; INSERT INTO t2 VALUES('d', 'e'); }
-      do_test 5.$tn.1 {
-        lindex [wal_checkpoint_v2 db truncate] 0
-      } {1}    ;# 1 -> SQLITE_BUSY
-      do_test 5.$tn.2 {
-        list [expr [file size test.db-wal]==0]  \
-             [expr [file size test.db2-wal]==0] \
-             [expr [file size test.db3-wal]==0]
-      } {1 0 1}
-      db2 eval ROLLBACK
-    }
-
-    3 {
-      # EVIDENCE-OF: R-38049-07913 If any other error occurs while processing
-      # an attached database, processing is abandoned and the error code is
-      # returned to the caller immediately.
-      tvfs filter xWrite
-      tvfs script inject_ioerr
-      proc inject_ioerr {method file args} {
-        if {[file tail $file]=="test.db2"} {
-          return "SQLITE_IOERR"
-        }
-        return 0
-      }
-      do_test 5.$tn.1 {
-        list [catch { wal_checkpoint_v2 db truncate } msg] $msg
-      } {1 {SQLITE_IOERR - disk I/O error}}
-      do_test 5.$tn.2 {
-        list [expr [file size test.db-wal]==0]  \
-             [expr [file size test.db2-wal]==0] \
-             [expr [file size test.db3-wal]==0]
-      } {1 0 0}
-      tvfs script ""
-    }
-  }
-
-  db close
-  db2 close
-}
-
-reset_db
-sqlite3 db2 test.db
-
-do_test 6.1 {
-  execsql {
-    PRAGMA auto_vacuum = 0; 
-    PRAGMA journal_mode = WAL;
-    CREATE TABLE t1(a, b);
-    INSERT INTO t1 VALUES(1, 2);
-  }
-  file size test.db-wal
-} [wal_file_size 3 1024]
-
-do_test 6.2 {
-  db2 eval { BEGIN; SELECT * FROM t1; }
-  db  eval { INSERT INTO t1 VALUES(3, 4) }
-  file size test.db-wal
-} [wal_file_size 4 1024]
-
-#   At this point the log file contains 4 frames. 3 of which it should
-#   be possible to checkpoint.
-#
-# EVIDENCE-OF: R-16642-42503 If pnLog is not NULL, then *pnLog is set to
-# the total number of frames in the log file or to -1 if the checkpoint
-# could not run because of an error or because the database is not in
-# WAL mode.
-#
-# EVIDENCE-OF: R-10514-25250 If pnCkpt is not NULL,then *pnCkpt is set
-# to the total number of checkpointed frames in the log file (including
-# any that were already checkpointed before the function was called) or
-# to -1 if the checkpoint could not run due to an error or because the
-# database is not in WAL mode.
-#
-do_test 6.4 {
-  lrange [wal_checkpoint_v2 db passive] 1 2
-} {4 3} 
-
-# EVIDENCE-OF: R-37257-17813 Note that upon successful completion of an
-# SQLITE_CHECKPOINT_TRUNCATE, the log file will have been truncated to
-# zero bytes and so both *pnLog and *pnCkpt will be set to zero.
-#
-do_test 6.5 {
-  db2 eval COMMIT
-  wal_checkpoint_v2 db truncate
-} {0 0 0}
-
-
-
-finish_test
-