80 lines
2.8 KiB
TypeScript
80 lines
2.8 KiB
TypeScript
import { expect } from './shared/expect'
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import { BitMathTest } from '../typechain/BitMathTest'
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import { ethers, waffle } from 'hardhat'
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import snapshotGasCost from './shared/snapshotGasCost'
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const { BigNumber } = ethers
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describe('BitMath', () => {
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let bitMath: BitMathTest
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const fixture = async () => {
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const factory = await ethers.getContractFactory('BitMathTest')
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return (await factory.deploy()) as BitMathTest
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}
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beforeEach('deploy BitMathTest', async () => {
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bitMath = await waffle.loadFixture(fixture)
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})
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describe('#mostSignificantBit', () => {
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it('0', async () => {
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await expect(bitMath.mostSignificantBit(0)).to.be.reverted
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})
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it('1', async () => {
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expect(await bitMath.mostSignificantBit(1)).to.eq(0)
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})
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it('2', async () => {
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expect(await bitMath.mostSignificantBit(2)).to.eq(1)
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})
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it('all powers of 2', async () => {
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const results = await Promise.all(
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[...Array(255)].map((_, i) => bitMath.mostSignificantBit(BigNumber.from(2).pow(i)))
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)
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expect(results).to.deep.eq([...Array(255)].map((_, i) => i))
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})
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it('uint256(-1)', async () => {
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expect(await bitMath.mostSignificantBit(BigNumber.from(2).pow(256).sub(1))).to.eq(255)
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})
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it('gas cost of smaller number', async () => {
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await snapshotGasCost(bitMath.getGasCostOfMostSignificantBit(BigNumber.from(3568)))
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})
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it('gas cost of max uint128', async () => {
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await snapshotGasCost(bitMath.getGasCostOfMostSignificantBit(BigNumber.from(2).pow(128).sub(1)))
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})
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it('gas cost of max uint256', async () => {
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await snapshotGasCost(bitMath.getGasCostOfMostSignificantBit(BigNumber.from(2).pow(256).sub(1)))
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})
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})
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describe('#leastSignificantBit', () => {
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it('0', async () => {
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await expect(bitMath.leastSignificantBit(0)).to.be.reverted
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})
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it('1', async () => {
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expect(await bitMath.leastSignificantBit(1)).to.eq(0)
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})
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it('2', async () => {
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expect(await bitMath.leastSignificantBit(2)).to.eq(1)
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})
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it('all powers of 2', async () => {
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const results = await Promise.all(
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[...Array(255)].map((_, i) => bitMath.leastSignificantBit(BigNumber.from(2).pow(i)))
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)
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expect(results).to.deep.eq([...Array(255)].map((_, i) => i))
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})
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it('uint256(-1)', async () => {
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expect(await bitMath.leastSignificantBit(BigNumber.from(2).pow(256).sub(1))).to.eq(0)
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})
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it('gas cost of smaller number', async () => {
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await snapshotGasCost(bitMath.getGasCostOfLeastSignificantBit(BigNumber.from(3568)))
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})
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it('gas cost of max uint128', async () => {
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await snapshotGasCost(bitMath.getGasCostOfLeastSignificantBit(BigNumber.from(2).pow(128).sub(1)))
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})
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it('gas cost of max uint256', async () => {
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await snapshotGasCost(bitMath.getGasCostOfLeastSignificantBit(BigNumber.from(2).pow(256).sub(1)))
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})
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})
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})
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