Add test cases and fix minor error-handling issues in unionvtab.c.

FossilOrigin-Name: deadaad2a0801b3c30d2a076d8eb006b62d8557cff820e0939741c078477c83f

test/unionvtabfault.test

@@ -0,0 +1,68 @@
+# 2017-07-15
+#
+# 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 percentile.c extension
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix unionvtabfault
+
+
+forcedelete test.db2
+do_execsql_test 1.0 {
+  ATTACH 'test.db2' AS aux;
+  CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT);
+  CREATE TABLE t2(a INTEGER PRIMARY KEY, b TEXT);
+  CREATE TABLE aux.t3(a INTEGER PRIMARY KEY, b TEXT);
+
+  INSERT INTO t1 VALUES(1, 'one'), (2, 'two'), (3, 'three');
+  INSERT INTO t2 VALUES(10, 'ten'), (11, 'eleven'), (12, 'twelve');
+  INSERT INTO t3 VALUES(20, 'twenty'), (21, 'twenty-one'), (22, 'twenty-two');
+}
+faultsim_save_and_close
+
+do_faultsim_test 1.1 -faults * -prep {
+  faultsim_restore_and_reopen
+  load_static_extension db unionvtab
+  execsql { ATTACH 'test.db2' AS aux; }
+  execsql { CREATE TEMP TABLE xyz(x); }
+} -body {
+  execsql {
+    CREATE VIRTUAL TABLE temp.uuu USING unionvtab(
+    "VALUES(NULL, 't1', 1, 9),  ('main', 't2', 10, 19), ('aux', 't3', 20, 29)"
+    );
+  }
+} -test {
+  faultsim_test_result {0 {}}             \
+     {1 {vtable constructor failed: uuu}} \
+     {1 {sql error: interrupted}}
+}
+
+faultsim_restore_and_reopen
+load_static_extension db unionvtab
+execsql { ATTACH 'test.db2' AS aux; }
+execsql { CREATE TEMP TABLE xyz(x); }
+execsql {
+  CREATE VIRTUAL TABLE temp.uuu USING unionvtab(
+      "VALUES(NULL, 't1', 1, 9),  ('main', 't2', 10, 19), ('aux', 't3', 20, 29)"
+  );
+}
+do_faultsim_test 1.2 -faults oom* -prep {
+} -body {
+  execsql { SELECT * FROM uuu }
+} -test {
+  faultsim_test_result {0 {1 one 2 two 3 three 10 ten 11 eleven 12 twelve 20 twenty 21 twenty-one 22 twenty-two}} 
+}
+
+
+finish_test
+