import { describe, it, expect, xit } from '@jest/globals' import CircularBuffer, { BufferFullError, BufferEmptyError, } from './circular-buffer.ts' describe('CircularBuffer', () => { it('reading an empty buffer throws a BufferEmptyError', () => { const buffer = new CircularBuffer(1) expect(() => buffer.read()).toThrow(BufferEmptyError) }) xit('write and read back one item', () => { const buffer = new CircularBuffer(1) buffer.write('1') expect(buffer.read()).toBe('1') expect(() => buffer.read()).toThrow(BufferEmptyError) }) xit('write and read back multiple items', () => { const buffer = new CircularBuffer(2) buffer.write('1') buffer.write('2') expect(buffer.read()).toBe('1') expect(buffer.read()).toBe('2') expect(() => buffer.read()).toThrow(BufferEmptyError) }) xit('clearing a buffer', () => { const buffer = new CircularBuffer(2) buffer.write('1') buffer.write('2') buffer.clear() expect(() => buffer.read()).toThrow(BufferEmptyError) buffer.write('3') buffer.write('4') expect(buffer.read()).toBe('3') expect(buffer.read()).toBe('4') }) xit('alternate write and read', () => { const buffer = new CircularBuffer(2) buffer.write('1') expect(buffer.read()).toBe('1') buffer.write('2') expect(buffer.read()).toBe('2') }) xit('reads back oldest item', () => { const buffer = new CircularBuffer(3) buffer.write('1') buffer.write('2') buffer.read() buffer.write('3') expect(buffer.read()).toBe('2') expect(buffer.read()).toBe('3') }) xit('writing to a full buffer throws a BufferFullError', () => { const buffer = new CircularBuffer(2) buffer.write('1') buffer.write('2') expect(() => buffer.write('A')).toThrow(BufferFullError) }) xit('forced writes over write oldest item in a full buffer', () => { const buffer = new CircularBuffer(2) buffer.write('1') buffer.write('2') buffer.forceWrite('A') expect(buffer.read()).toBe('2') expect(buffer.read()).toBe('A') expect(() => buffer.read()).toThrow(BufferEmptyError) }) xit('forced writes act like write in a non-full buffer', () => { const buffer = new CircularBuffer(2) buffer.write('1') buffer.forceWrite('2') expect(buffer.read()).toBe('1') expect(buffer.read()).toBe('2') expect(() => buffer.read()).toThrow(BufferEmptyError) }) xit('alternate force write and read into full buffer', () => { const buffer = new CircularBuffer(5) buffer.write('1') buffer.write('2') buffer.write('3') buffer.read() buffer.read() buffer.write('4') buffer.read() buffer.write('5') buffer.write('6') buffer.write('7') buffer.write('8') buffer.forceWrite('A') buffer.forceWrite('B') expect(buffer.read()).toBe('6') expect(buffer.read()).toBe('7') expect(buffer.read()).toBe('8') expect(buffer.read()).toBe('A') expect(buffer.read()).toBe('B') expect(() => buffer.read()).toThrow(BufferEmptyError) }) })