151 lines
4.6 KiB
C++
151 lines
4.6 KiB
C++
/*
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* Unit tests for class CircularBuffer.
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*/
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#include "util/CircularBuffer.hxx"
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#include <gtest/gtest.h>
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TEST(CircularBuffer, Basic)
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{
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constexpr size_t N = 8;
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int data[N];
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CircularBuffer<int> buffer(data, N);
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EXPECT_EQ(size_t(N), buffer.GetCapacity());
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/* '.' = empty; 'O' = occupied; 'X' = blocked */
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/* checks on empty buffer */
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/* [.......X] */
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EXPECT_TRUE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_EQ(size_t(0), buffer.GetSize());
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EXPECT_EQ(size_t(7), buffer.GetSpace());
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EXPECT_TRUE(buffer.Read().empty());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[0], buffer.Write().data());
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EXPECT_EQ(size_t(7), buffer.Write().size());
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/* append one element */
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/* [O......X] */
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buffer.Append(1);
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EXPECT_FALSE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(1), buffer.GetSize());
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EXPECT_EQ(size_t(6), buffer.GetSpace());
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EXPECT_EQ(size_t(1), buffer.Read().size());
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EXPECT_EQ(&data[0], buffer.Read().data());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[1], buffer.Write().data());
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EXPECT_EQ(size_t(6), buffer.Write().size());
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/* append 6 elements, buffer is now full */
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/* [OOOOOOOX] */
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buffer.Append(6);
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EXPECT_FALSE(buffer.empty());
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EXPECT_TRUE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(7), buffer.GetSize());
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EXPECT_EQ(size_t(0), buffer.GetSpace());
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EXPECT_EQ(size_t(7), buffer.Read().size());
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EXPECT_EQ(&data[0], buffer.Read().data());
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EXPECT_TRUE(buffer.Write().empty());
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/* consume [0]; can append one at [7] */
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/* [XOOOOOO.] */
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buffer.Consume(1);
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EXPECT_FALSE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(6), buffer.GetSize());
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EXPECT_EQ(size_t(1), buffer.GetSpace());
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EXPECT_EQ(size_t(6), buffer.Read().size());
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EXPECT_EQ(&data[1], buffer.Read().data());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[7], buffer.Write().data());
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EXPECT_EQ(size_t(1), buffer.Write().size());
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/* append one element; [0] is still empty but cannot
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be written to because head==1 */
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/* [XOOOOOOO] */
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buffer.Append(1);
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EXPECT_FALSE(buffer.empty());
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EXPECT_TRUE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(7), buffer.GetSize());
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EXPECT_EQ(size_t(0), buffer.GetSpace());
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EXPECT_EQ(size_t(7), buffer.Read().size());
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EXPECT_EQ(&data[1], buffer.Read().data());
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EXPECT_TRUE(buffer.Write().empty());
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/* consume [1..3]; can append [0..2] */
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/* [...XOOOO] */
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buffer.Consume(3);
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EXPECT_FALSE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(4), buffer.GetSize());
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EXPECT_EQ(size_t(3), buffer.GetSpace());
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EXPECT_EQ(size_t(4), buffer.Read().size());
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EXPECT_EQ(&data[4], buffer.Read().data());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[0], buffer.Write().data());
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EXPECT_EQ(size_t(3), buffer.Write().size());
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/* append [0..1] */
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/* [OO.XOOOO] */
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buffer.Append(2);
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EXPECT_FALSE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(6), buffer.GetSize());
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EXPECT_EQ(size_t(1), buffer.GetSpace());
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EXPECT_EQ(size_t(4), buffer.Read().size());
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EXPECT_EQ(&data[4], buffer.Read().data());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[2], buffer.Write().data());
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EXPECT_EQ(size_t(1), buffer.Write().size());
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/* append [2] */
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/* [OOOXOOOO] */
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buffer.Append(1);
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EXPECT_FALSE(buffer.empty());
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EXPECT_TRUE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(7), buffer.GetSize());
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EXPECT_EQ(size_t(0), buffer.GetSpace());
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EXPECT_EQ(size_t(4), buffer.Read().size());
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EXPECT_EQ(&data[4], buffer.Read().data());
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EXPECT_TRUE(buffer.Write().empty());
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/* consume [4..7] */
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/* [OOO....X] */
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buffer.Consume(4);
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EXPECT_FALSE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_FALSE(buffer.Read().empty());
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EXPECT_EQ(size_t(3), buffer.GetSize());
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EXPECT_EQ(size_t(4), buffer.GetSpace());
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EXPECT_EQ(size_t(3), buffer.Read().size());
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EXPECT_EQ(&data[0], buffer.Read().data());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[3], buffer.Write().data());
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EXPECT_EQ(size_t(4), buffer.Write().size());
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/* consume [0..2]; after that, we can only write 5,
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because the CircularBuffer class doesn't have
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special code to rewind/reset an empty buffer */
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/* [..X.....] */
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buffer.Consume(3);
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EXPECT_TRUE(buffer.empty());
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EXPECT_FALSE(buffer.IsFull());
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EXPECT_EQ(size_t(0), buffer.GetSize());
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EXPECT_EQ(size_t(7), buffer.GetSpace());
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EXPECT_TRUE(buffer.Read().empty());
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EXPECT_FALSE(buffer.Write().empty());
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EXPECT_EQ(&data[3], buffer.Write().data());
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EXPECT_EQ(size_t(5), buffer.Write().size());
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}
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