[sql] Callback and scoped-ignore tests for sql::Statement.

sql/test/error_callback_support.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SQL_TEST_ERROR_CALLBACK_SUPPORT_H_
+#define SQL_TEST_ERROR_CALLBACK_SUPPORT_H_
+
+#include "sql/connection.h"
+
+namespace sql {
+
+// Helper to capture any errors into a local variable for testing.
+// For instance:
+//   int error = SQLITE_OK;
+//   ScopedErrorCallback sec(db, base::Bind(&CaptureErrorCallback, &error));
+//   // Provoke SQLITE_CONSTRAINT on db.
+//   EXPECT_EQ(SQLITE_CONSTRAINT, error);
+void CaptureErrorCallback(int* error_pointer, int error, sql::Statement* stmt);
+
+// Helper to set db's error callback and then reset it when it goes
+// out of scope.
+class ScopedErrorCallback {
+ public:
+  ScopedErrorCallback(sql::Connection* db,
+                      const sql::Connection::ErrorCallback& cb);
+  ~ScopedErrorCallback();
+
+ private:
+  sql::Connection* db_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedErrorCallback);
+};
+
+}  // namespace sql
+
+#endif  // SQL_TEST_ERROR_CALLBACK_SUPPORT_H_