import org.junit.Test import org.junit.Ignore import kotlin.test.assertEquals import kotlin.test.assertFailsWith class CircularBufferTest { @Test fun `reading empty buffer should fail`() { val buffer = CircularBuffer(1) assertFailsWith() { buffer.read() } } @Ignore @Test fun `can read an item just written`() { val buffer = CircularBuffer(1) buffer.write(1) assertEquals(1, buffer.read()) } @Ignore @Test fun `each item may only be read once`() { val buffer = CircularBuffer(1) buffer.write(1) assertEquals(1, buffer.read()) assertFailsWith { buffer.read() } } @Ignore @Test fun `items are read in the order they are written`() { val buffer = CircularBuffer(2) buffer.write(1) buffer.write(2) assertEquals(1, buffer.read()) assertEquals(2, buffer.read()) } @Ignore @Test fun `full buffer can't be written to`() { val buffer = CircularBuffer(1) buffer.write(1) assertFailsWith { buffer.write(2) } } @Ignore @Test fun `a read frees up capacity for another write`() { val buffer = CircularBuffer(1) buffer.write(1) assertEquals(1, buffer.read()) buffer.write(2) assertEquals(2, buffer.read()) } @Ignore @Test fun `read position is maintained even across multiple writes`() { val buffer = CircularBuffer(3) buffer.write(1) buffer.write(2) assertEquals(1, buffer.read()) buffer.write(3) assertEquals(2, buffer.read()) assertEquals(3, buffer.read()) } @Ignore @Test fun `items cleared out of buffer can't be read`() { val buffer = CircularBuffer(1) buffer.write(1) buffer.clear() assertFailsWith { buffer.read() } } @Ignore @Test fun `clear frees up capacity for another write`() { val buffer = CircularBuffer(1) buffer.write(1) buffer.clear() buffer.write(2) assertEquals(2, buffer.read()) } @Ignore @Test fun `clear does nothing on empty buffer`() { val buffer = CircularBuffer(1) buffer.clear() buffer.write(1) assertEquals(1, buffer.read()) } @Ignore @Test fun `overwrite acts like write on non-full buffer`() { val buffer = CircularBuffer(2) buffer.write(1) buffer.overwrite(2) assertEquals(1, buffer.read()) assertEquals(2, buffer.read()) } @Ignore @Test fun `overwrite replaces the oldest item on full buffer`() { val buffer = CircularBuffer(2) buffer.write(1) buffer.write(2) buffer.overwrite(3) assertEquals(2, buffer.read()) assertEquals(3, buffer.read()) } @Ignore @Test fun `overwrite replaces the oldest item remaining in buffer following a read`() { val buffer = CircularBuffer(3) buffer.write(1) buffer.write(2) buffer.write(3) assertEquals(1, buffer.read()) buffer.write(4) buffer.overwrite(5) assertEquals(3, buffer.read()) assertEquals(4, buffer.read()) assertEquals(5, buffer.read()) } @Ignore @Test fun `initial clear does not affect wrapping around`() { val buffer = CircularBuffer(2) buffer.clear() buffer.write(1) buffer.write(2) buffer.overwrite(3) buffer.overwrite(4) assertEquals(3, buffer.read()) assertEquals(4, buffer.read()) assertFailsWith { buffer.read() } } }