[sql] Framework for allowing tests to handle errors.

sql/test/scoped_error_ignorer.cc

+// Copyright (c) 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.
+
+#include "sql/test/scoped_error_ignorer.h"
+
+#include "base/bind.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sql {
+
+ScopedErrorIgnorer::ScopedErrorIgnorer()
+    : checked_(false) {
+  callback_ =
+      base::Bind(&ScopedErrorIgnorer::ShouldIgnore, base::Unretained(this));
+  Connection::SetErrorIgnorer(&callback_);
+}
+
+ScopedErrorIgnorer::~ScopedErrorIgnorer() {
+  EXPECT_TRUE(checked_) << " Test must call CheckIgnoredErrors()";
+  Connection::ResetErrorIgnorer();
+}
+
+void ScopedErrorIgnorer::IgnoreError(int err) {
+  EXPECT_EQ(0u, ignore_errors_.count(err))
+      << " Error " << err << " is already ignored";
+  ignore_errors_.insert(err);
+}
+
+bool ScopedErrorIgnorer::CheckIgnoredErrors() {
+  checked_ = true;
+  return errors_ignored_ == ignore_errors_;
+}
+
+bool ScopedErrorIgnorer::ShouldIgnore(int err) {
+  // Look for extended code.
+  if (ignore_errors_.count(err) > 0) {
+    // Record that the error was seen and ignore it.
+    errors_ignored_.insert(err);
+    return true;
+  }
+
+  // Trim extended codes and check again.
+  int base_err = err & 0xff;
+  if (ignore_errors_.count(base_err) > 0) {
+    // Record that the error was seen and ignore it.
+    errors_ignored_.insert(base_err);
+    return true;
+  }
+
+  // Unexpected error.
+  ADD_FAILURE() << " Unexpected SQLite error " << err;
+
+  // TODO(shess): If it never makes sense to pass through an error
+  // under the test harness, then perhaps the ignore callback
+  // signature should be changed.
+  return true;
+}
+
+}  // namespace sql