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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/metrics/bucket_ranges.h"
#include <stdint.h>
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
TEST(BucketRangesTest, NormalSetup) {
BucketRanges ranges(5);
ASSERT_EQ(5u, ranges.size());
ASSERT_EQ(4u, ranges.bucket_count());
for (int i = 0; i < 5; ++i) {
EXPECT_EQ(0, ranges.range(i));
}
EXPECT_EQ(0u, ranges.checksum());
ranges.set_range(3, 100);
EXPECT_EQ(100, ranges.range(3));
}
TEST(BucketRangesTest, Equals) {
// Compare empty ranges.
BucketRanges ranges1(3);
BucketRanges ranges2(3);
BucketRanges ranges3(5);
EXPECT_TRUE(ranges1.Equals(&ranges2));
EXPECT_FALSE(ranges1.Equals(&ranges3));
EXPECT_FALSE(ranges2.Equals(&ranges3));
// Compare full filled ranges.
ranges1.set_range(0, 0);
ranges1.set_range(1, 1);
ranges1.set_range(2, 2);
ranges1.set_checksum(100);
ranges2.set_range(0, 0);
ranges2.set_range(1, 1);
ranges2.set_range(2, 2);
ranges2.set_checksum(100);
EXPECT_TRUE(ranges1.Equals(&ranges2));
// Checksum does not match.
ranges1.set_checksum(99);
EXPECT_FALSE(ranges1.Equals(&ranges2));
ranges1.set_checksum(100);
// Range does not match.
ranges1.set_range(1, 3);
EXPECT_FALSE(ranges1.Equals(&ranges2));
}
TEST(BucketRangesTest, Checksum) {
BucketRanges ranges(3);
ranges.set_range(0, 0);
ranges.set_range(1, 1);
ranges.set_range(2, 2);
ranges.ResetChecksum();
EXPECT_EQ(289217253u, ranges.checksum());
ranges.set_range(2, 3);
EXPECT_FALSE(ranges.HasValidChecksum());
ranges.ResetChecksum();
EXPECT_EQ(2843835776u, ranges.checksum());
EXPECT_TRUE(ranges.HasValidChecksum());
}
TEST(BucketRangesTest, FromData) {
// Known good value #1
{
BucketRanges ranges({0, 1, 2});
EXPECT_EQ(ranges.size(), 3);
EXPECT_EQ(ranges.range(0), 0);
EXPECT_EQ(ranges.range(1), 1);
EXPECT_EQ(ranges.range(2), 2);
EXPECT_EQ(ranges.checksum(), 289217253u);
}
// Known good value #2
{
BucketRanges ranges({0, 1, 3});
EXPECT_EQ(ranges.size(), 3);
EXPECT_EQ(ranges.range(0), 0);
EXPECT_EQ(ranges.range(1), 1);
EXPECT_EQ(ranges.range(2), 3);
EXPECT_EQ(ranges.checksum(), 2843835776u);
}
// Must be non-empty.
{
BucketRanges ranges({});
EXPECT_EQ(ranges.size(), 0);
EXPECT_EQ(ranges.checksum(), 0);
}
// Must be non-negative.
{
BucketRanges ranges({-1, 1, 2});
EXPECT_EQ(ranges.size(), 0);
EXPECT_EQ(ranges.checksum(), 0);
}
// Must be in sorted order.
{
BucketRanges ranges({0, 2, 1});
EXPECT_EQ(ranges.size(), 0);
EXPECT_EQ(ranges.checksum(), 0);
}
// Must not contain duplicate values
{
BucketRanges ranges({0, 0, 1});
EXPECT_EQ(ranges.size(), 0);
EXPECT_EQ(ranges.checksum(), 0);
}
}
} // namespace
} // namespace base
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