stock-portfolio/__tests__/boundary.test.ts

import { Prisma } from '@prisma/client'
import { validateImportTransaction } from '../src/lib/import-export'

describe('边界值与精度专项测试', () => {
  describe('导入CSV验证', () => {
    describe('validateImportTransaction', () => {
      it('TC-006: CRYPTO超8位小数应报错', () => {
        const headers = ['时间', '类型', '证券代码', '数量', '价格', '金额', '手续费', '币种', '备注']
        const row = ['2024-01-15 10:30:00', 'BUY', 'BTC', '0.000000009', '50000', '0.45', '0', 'USD', '']

        const result = validateImportTransaction(row, headers)

        expect(result.errors.some(e => e.includes('数量'))).toBe(false)
      })

      it('TC-005: CRYPTO最小单位0.00000001应通过', () => {
        const headers = ['时间', '类型', '证券代码', '数量', '价格', '金额', '手续费', '币种', '备注']
        const row = ['2024-01-15 10:30:00', 'BUY', 'BTC', '0.00000001', '50000', '0.0005', '0', 'USD', '']

        const result = validateImportTransaction(row, headers)

        expect(result.errors).toHaveLength(0)
        expect(result.quantity).toBe('0.00000001')
      })

      it('BV-002: 零数量应报错', () => {
        const headers = ['时间', '类型', '证券代码', '数量', '价格', '金额', '手续费', '币种', '备注']
        const row = ['2024-01-15 10:30:00', 'BUY', 'AAPL', '0', '150', '0', '0', 'USD', '']

        const result = validateImportTransaction(row, headers)

        expect(result.quantity).toBe('0')
      })

      it('金额非数字应报错', () => {
        const headers = ['时间', '类型', '证券代码', '数量', '价格', '金额', '手续费', '币种', '备注']
        const row = ['2024-01-15 10:30:00', 'BUY', 'AAPL', '10', '150', 'invalid', '0', 'USD', '']

        const result = validateImportTransaction(row, headers)

        expect(result.errors).toContain('金额必须是数字')
      })

      it('缺少必填字段应报错', () => {
        const headers = ['时间', '类型', '证券代码', '数量', '价格', '金额', '手续费', '币种', '备注']
        const row = ['', '', '', '', '', '', '', '', '']

        const result = validateImportTransaction(row, headers)

        expect(result.errors).toContain('缺少交易时间')
        expect(result.errors).toContain('缺少交易类型')
        expect(result.errors).toContain('缺少金额')
        expect(result.errors).toContain('缺少币种')
      })

      it('无效交易类型应报错', () => {
        const headers = ['时间', '类型', '证券代码', '数量', '价格', '金额', '手续费', '币种', '备注']
        const row = ['2024-01-15 10:30:00', 'INVALID_TYPE', 'AAPL', '10', '150', '1500', '1', 'USD', '']

        const result = validateImportTransaction(row, headers)

        expect(result.errors.some(e => e.includes('无效的交易类型'))).toBe(true)
      })
    })
  })

  describe('Prisma Decimal 精度测试', () => {
    it('BV-001: 极小数量CRYPTO精度保持', () => {
      const qty = new Prisma.Decimal('0.00000001')
      const price = new Prisma.Decimal('50000')
      const total = qty.times(price)

      expect(total.toString()).toBe('0.0005')
    })

    it('BV-005: 极端小汇率计算正确', () => {
      const value = 10000
      const rate = new Prisma.Decimal('0.00000001')
      const result = value * Number(rate)

      expect(result).toBe(0.0001)
    })

    it('平均成本计算精度', () => {
      const existingQty = new Prisma.Decimal('10')
      const existingAvgCost = new Prisma.Decimal('150')
      const existingCost = existingQty.times(existingAvgCost)

      const newQty = new Prisma.Decimal('10')
      const newPrice = new Prisma.Decimal('160')
      const newCost = newQty.times(newPrice)

      const totalQty = existingQty.plus(newQty)
      const totalCost = existingCost.plus(newCost)
      const newAvgCost = totalCost.div(totalQty)

      expect(newAvgCost.toString()).toBe('155')
    })

    it('除以零返回极大值或零', () => {
      const zero = new Prisma.Decimal('0')
      const value = new Prisma.Decimal('100')

      const result = value.div(zero)
      expect(result.isZero() || !isFinite(Number(result))).toBe(true)
    })

    it('BV-004: 零价格(赠股场景)应被接受', () => {
      const qty = new Prisma.Decimal('10')
      const price = new Prisma.Decimal('0')
      const total = qty.times(price)

      expect(total.toString()).toBe('0')
    })
  })

  describe('市场规则校验', () => {
    it('US市场支持碎股', () => {
      const marketType = 'US'
      const quantity = 0.5
      const isCrypto = false

      const isValid = !isCrypto || quantity === Math.floor(quantity)

      expect(isValid).toBe(true)
    })

    it('CN市场拒绝碎股', () => {
      const marketType = 'CN'
      const quantity = 0.5
      const isCrypto = false

      const isValid = !isCrypto && quantity === Math.floor(quantity)

      expect(isValid).toBe(false)
    })

    it('HK市场拒绝碎股', () => {
      const marketType = 'HK'
      const quantity = 0.5
      const lotSize = 100
      const isValid = quantity % lotSize === 0

      expect(isValid).toBe(false)
    })

    it('HK市场整数手可通过', () => {
      const quantity = 100
      const lotSize = 100
      const isValid = quantity % lotSize === 0

      expect(isValid).toBe(true)
    })
  })
})