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// Copyright 2018 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 "extensions/browser/extension_event_histogram_value.h"
#include <map>
#include <set>
#include <string>
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/strings/stringprintf.h"
#include "base/test/metrics/histogram_enum_reader.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace extensions {
// Tests that the ExtensionEvents enum in enums.xml exactly matches the
// C++ enum definition.
TEST(ExtensionEventHistogramValueTest, CheckEnums) {
base::Optional<base::HistogramEnumEntryMap> enums =
base::ReadEnumFromEnumsXml("ExtensionEvents");
ASSERT_TRUE(enums);
// The number of enums in the histogram entry should be equal to the number of
// enums in the C++ file.
EXPECT_EQ(events::ENUM_BOUNDARY, enums->size());
base::FilePath src_root;
ASSERT_TRUE(base::PathService::Get(base::DIR_SOURCE_ROOT, &src_root));
base::FilePath event_histogram_value =
src_root.AppendASCII("extensions")
.AppendASCII("browser")
.AppendASCII("extension_event_histogram_value.h");
ASSERT_TRUE(base::PathExists(event_histogram_value));
std::string file_contents;
ASSERT_TRUE(base::ReadFileToString(event_histogram_value, &file_contents));
for (const auto& entry : *enums) {
// Check that the C++ file has a definition equal to the histogram file.
// NOTE: For now, we do this in a simple, but reasonably effective, manner:
// expecting to find the string "ENTRY = <value>" somewhere in the file.
std::string expected_string =
base::StringPrintf("%s = %d,", entry.second.c_str(), entry.first);
EXPECT_NE(std::string::npos, file_contents.find(expected_string))
<< "Failed to find entry " << entry.second << " with value "
<< entry.first << ". Make sure events::HistogramValue and the "
<< "ExtensionEvents enum in enums.xml agree with each other.";
}
}
} // namespace extensions
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