Import SQLite 3.7.6.3.

third_party/sqlite/src/test/cache.test

Index: third_party/sqlite/src/test/cache.test
diff --git a/third_party/sqlite/src/test/cache.test b/third_party/sqlite/src/test/cache.test
index dd51c7cd1f1482f422960970bb0d4e8e344f4c88..8d801f05998775228d2c95acc8ba8bcc0ab14196 100644
--- a/third_party/sqlite/src/test/cache.test
+++ b/third_party/sqlite/src/test/cache.test
@@ -28,9 +28,9 @@ proc pager_cache_size {db} {
   return $stats(page)
 }
 
-do_test cache-1.1 {
-  pager_cache_size db
-} {0}
+if {[permutation] == ""} { 
+  do_test cache-1.1 { pager_cache_size db } {0}
+}
 
 do_test cache-1.2 {
   execsql {
@@ -51,13 +51,90 @@ do_test cache-1.2 {
 #
 set cache_size [pager_cache_size db]
 for {set ii 0} {$ii < 10} {incr ii} {
-
   do_test cache-1.3.$ii {
     execsql {SELECT * FROM abc}
     pager_cache_size db
   } $::cache_size
+}
+
+#-------------------------------------------------------------------------
+# This block of tests checks that it is possible to set the cache_size of a
+# database to a small (< 10) value. More specifically:
+#
+#   cache-2.1.*: Test that "PRAGMA cache_size" appears to work with small 
+#                values.
+#   cache-2.2.*: Test that "PRAGMA main.cache_size" appears to work with 
+#                small values.
+#   cache-2.3.*: Test cache_size=1 correctly spills/flushes the cache. 
+#   cache-2.4.*: Test cache_size=0 correctly spills/flushes the cache. 
+#
+#
+db_delete_and_reopen
+do_execsql_test cache-2.0 {
+  PRAGMA auto_vacuum=OFF;
+  PRAGMA journal_mode=DELETE;
+  CREATE TABLE t1(a, b);
+  CREATE TABLE t2(c, d);
+  INSERT INTO t1 VALUES('x', 'y');
+  INSERT INTO t2 VALUES('i', 'j');
+} {delete}
 
+for {set i 0} {$i < 20} {incr i} {
+  do_execsql_test cache-2.1.$i.1 "PRAGMA cache_size = $i"
+  do_execsql_test cache-2.1.$i.2 "PRAGMA cache_size" $i
+  do_execsql_test cache-2.1.$i.3 "SELECT * FROM t1" {x y}
+  do_execsql_test cache-2.1.$i.4 "PRAGMA cache_size" $i
 }
-sqlite3_soft_heap_limit $soft_limit
+for {set i 0} {$i < 20} {incr i} {
+  do_execsql_test cache-2.2.$i.1 "PRAGMA main.cache_size = $i"
+  do_execsql_test cache-2.2.$i.2 "PRAGMA main.cache_size" $i
+  do_execsql_test cache-2.2.$i.3 "SELECT * FROM t1" {x y}
+  do_execsql_test cache-2.2.$i.4 "PRAGMA main.cache_size" $i
+}
+
+# Tests for cache_size = 1.
+#
+do_execsql_test cache-2.3.1 {
+  PRAGMA cache_size = 1;
+  BEGIN;
+    INSERT INTO t1 VALUES(1, 2);
+    PRAGMA lock_status;
+} {main reserved temp closed}
+do_test cache-2.3.2 { pager_cache_size db } 2
+do_execsql_test cache-2.3.3 {
+    INSERT INTO t2 VALUES(1, 2);
+    PRAGMA lock_status;
+} {main exclusive temp closed}
+do_test cache-2.3.4 { pager_cache_size db } 2
+do_execsql_test cache-2.3.5 COMMIT
+do_test cache-2.3.6 { pager_cache_size db } 1
+
+do_execsql_test cache-2.3.7 {
+  SELECT * FROM t1 UNION SELECT * FROM t2;
+} {1 2 i j x y}
+do_test cache-2.3.8 { pager_cache_size db } 1
+
+# Tests for cache_size = 0.
+#
+do_execsql_test cache-2.4.1 {
+  PRAGMA cache_size = 0;
+  BEGIN;
+    INSERT INTO t1 VALUES(1, 2);
+    PRAGMA lock_status;
+} {main reserved temp closed}
+do_test cache-2.4.2 { pager_cache_size db } 2
+do_execsql_test cache-2.4.3 {
+    INSERT INTO t2 VALUES(1, 2);
+    PRAGMA lock_status;
+} {main exclusive temp closed}
+do_test cache-2.4.4 { pager_cache_size db } 2
+do_execsql_test cache-2.4.5 COMMIT
+
+do_test cache-2.4.6 { pager_cache_size db } 0
+do_execsql_test cache-2.4.7 {
+  SELECT * FROM t1 UNION SELECT * FROM t2;
+} {1 2 i j x y}
+do_test cache-2.4.8 { pager_cache_size db } 0
 
+sqlite3_soft_heap_limit $cmdlinearg(soft-heap-limit)
 finish_test