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/*
* Copyright 2025 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <ui/RingBuffer.h>
namespace android::ui {
TEST(RingBuffer, basic) {
RingBuffer<int, 5> rb;
rb.next() = 1;
ASSERT_EQ(1, rb.size());
ASSERT_EQ(1, rb.back());
ASSERT_EQ(1, rb.front());
rb.next() = 2;
ASSERT_EQ(2, rb.size());
ASSERT_EQ(2, rb.back());
ASSERT_EQ(1, rb.front());
ASSERT_EQ(1, rb[-1]);
rb.next() = 3;
ASSERT_EQ(3, rb.size());
ASSERT_EQ(3, rb.back());
ASSERT_EQ(1, rb.front());
ASSERT_EQ(2, rb[-1]);
ASSERT_EQ(1, rb[-2]);
rb.next() = 4;
ASSERT_EQ(4, rb.size());
ASSERT_EQ(4, rb.back());
ASSERT_EQ(1, rb.front());
ASSERT_EQ(3, rb[-1]);
ASSERT_EQ(2, rb[-2]);
ASSERT_EQ(1, rb[-3]);
rb.next() = 5;
ASSERT_EQ(5, rb.size());
ASSERT_EQ(5, rb.back());
ASSERT_EQ(1, rb.front());
ASSERT_EQ(4, rb[-1]);
ASSERT_EQ(3, rb[-2]);
ASSERT_EQ(2, rb[-3]);
ASSERT_EQ(1, rb[-4]);
rb.next() = 6;
ASSERT_EQ(5, rb.size());
ASSERT_EQ(6, rb.back());
ASSERT_EQ(2, rb.front());
ASSERT_EQ(5, rb[-1]);
ASSERT_EQ(4, rb[-2]);
ASSERT_EQ(3, rb[-3]);
ASSERT_EQ(2, rb[-4]);
}
} // namespace android::ui
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