ghostfolio/libs/ui/src/lib/holdings-table/quantity-precision.spec.ts

import { PortfolioPosition } from '@ghostfolio/common/interfaces';

import { AssetSubClass } from '@prisma/client';

import { getHoldingQuantityPrecision } from './quantity-precision';

function createHolding(
  quantity: number,
  assetSubClass: AssetSubClass
): Pick<PortfolioPosition, 'assetProfile' | 'quantity'> {
  return {
    assetProfile: { assetSubClass } as PortfolioPosition['assetProfile'],
    quantity
  };
}

describe('getHoldingQuantityPrecision', () => {
  it('preserves satoshi precision for fractional cryptocurrency quantities', () => {
    expect(
      getHoldingQuantityPrecision(
        createHolding(0.01525217, AssetSubClass.CRYPTOCURRENCY)
      )
    ).toBe(8);
    expect(
      getHoldingQuantityPrecision(
        createHolding(10.12345678, AssetSubClass.CRYPTOCURRENCY)
      )
    ).toBe(8);
  });

  it('does not add decimal places to integer cryptocurrency quantities', () => {
    expect(
      getHoldingQuantityPrecision(
        createHolding(12, AssetSubClass.CRYPTOCURRENCY)
      )
    ).toBe(0);
  });

  it('keeps the existing precision for non-cryptocurrency quantities', () => {
    expect(
      getHoldingQuantityPrecision(createHolding(12.3456, AssetSubClass.STOCK))
    ).toBe(2);
  });
});