add tests for queryWalk()

simpletest/WalkTest.php

@@ -0,0 +1,24 @@
+<?php
+
+class WalkTest extends SimpleTest {
+  function test_1_walk() {
+    $Walk = DB::queryWalk("SELECT * FROM accounts");
+
+    $results = array();
+    while ($row = $Walk->next()) {
+      $results[] = $row;
+    }
+
+    $this->assert(count($results) == 8);
+    $this->assert($results[7]['username'] == 'vookoo');
+  }
+
+  function test_2_walk_stop() {
+    $Walk = DB::queryWalk("SELECT * FROM accounts");
+    $Walk->next();
+    unset($Walk);
+
+    // if $Walk hasn't been properly freed, this will produce an out of sync error
+    DB::query("SELECT * FROM accounts");
+  }
+}