logos-storage-contracts-eth/test/Marketplace.test.js

const { ethers } = require("hardhat")
const { AddressZero } = ethers.constants
const { BigNumber } = ethers
const { expect } = require("chai")
const {
  exampleConfiguration,
  exampleRequest,
  exampleProof,
  invalidProof,
} = require("./examples")
const { periodic, hours } = require("./time")
const { requestId, slotId, askToArray } = require("./ids")
const {
  RequestState,
  SlotState,
  enableRequestAssertions,
} = require("./requests")
const {
  waitUntilCancelled,
  waitUntilStarted,
  waitUntilFinished,
  waitUntilFailed,
  waitUntilSlotFailed,
  patchOverloads,
} = require("./marketplace")
const {
  maxPrice,
  pricePerSlotPerSecond,
  payoutForDuration,
} = require("./price")
const { collateralPerSlot } = require("./collateral")
const {
  snapshot,
  revert,
  ensureMinimumBlockHeight,
  advanceTime,
  advanceTimeTo,
  currentTime,
  setNextBlockTimestamp,
} = require("./evm")
const { arrayify } = require("ethers/lib/utils")

const ACCOUNT_STARTING_BALANCE = 1_000_000_000_000_000

describe("Marketplace constructor", function () {
  let Marketplace, token, verifier, config

  beforeEach(async function () {
    await snapshot()
    await ensureMinimumBlockHeight(256)

    const TestToken = await ethers.getContractFactory("TestToken")
    token = await TestToken.deploy()

    const TestVerifier = await ethers.getContractFactory("TestVerifier")
    verifier = await TestVerifier.deploy()

    Marketplace = await ethers.getContractFactory("TestMarketplace")
    config = exampleConfiguration()
  })

  afterEach(async function () {
    await revert()
  })

  function testPercentageOverflow(property, expectedError) {
    it(`should reject for ${property} overflowing percentage values`, async () => {
      config.collateral[property] = 101

      await expect(
        Marketplace.deploy(config, token.address, verifier.address)
      ).to.be.revertedWith(expectedError)
    })
  }

  testPercentageOverflow(
    "repairRewardPercentage",
    "Marketplace_RepairRewardPercentageTooHigh"
  )
  testPercentageOverflow(
    "slashPercentage",
    "Marketplace_SlashPercentageTooHigh"
  )

  it("should reject when total slash percentage exceeds 100%", async () => {
    config.collateral.slashPercentage = 1
    config.collateral.maxNumberOfSlashes = 101

    await expect(
      Marketplace.deploy(config, token.address, verifier.address)
    ).to.be.revertedWith("Marketplace_MaximumSlashingTooHigh")
  })
})

describe("Marketplace", function () {
  const proof = exampleProof()
  const config = exampleConfiguration()

  let marketplace
  let token
  let verifier
  let client,
    clientWithdrawRecipient,
    host,
    host1,
    host2,
    host3,
    hostRewardRecipient,
    hostCollateralRecipient,
    validatorRecipient
  let request
  let slot

  enableRequestAssertions()

  beforeEach(async function () {
    await snapshot()
    await ensureMinimumBlockHeight(256)
    ;[
      client,
      clientWithdrawRecipient,
      host1,
      host2,
      host3,
      hostRewardRecipient,
      hostCollateralRecipient,
      validatorRecipient,
    ] = await ethers.getSigners()
    host = host1

    const TestToken = await ethers.getContractFactory("TestToken")
    token = await TestToken.deploy()
    for (let account of [
      client,
      clientWithdrawRecipient,
      host1,
      host2,
      host3,
      hostRewardRecipient,
      hostCollateralRecipient,
      validatorRecipient,
    ]) {
      await token.mint(account.address, ACCOUNT_STARTING_BALANCE)
    }

    const TestVerifier = await ethers.getContractFactory("TestVerifier")
    verifier = await TestVerifier.deploy()

    const Marketplace = await ethers.getContractFactory("TestMarketplace")
    marketplace = await Marketplace.deploy(
      config,
      token.address,
      verifier.address
    )
    patchOverloads(marketplace)

    request = await exampleRequest()
    request.client = client.address

    slot = {
      request: requestId(request),
      index: request.ask.slots / 2,
    }
  })

  afterEach(async function () {
    await revert()
  })

  function switchAccount(account) {
    token = token.connect(account)
    marketplace = marketplace.connect(account)
    patchOverloads(marketplace)
  }

  describe("requesting storage", function () {
    beforeEach(function () {
      switchAccount(client)
    })

    it("emits event when storage is requested", async function () {
      await token.approve(marketplace.address, maxPrice(request))
      const now = await currentTime()
      await setNextBlockTimestamp(now)
      const expectedExpiry = now + request.expiry
      await expect(marketplace.requestStorage(request))
        .to.emit(marketplace, "StorageRequested")
        .withArgs(requestId(request), askToArray(request.ask), expectedExpiry)
    })

    it("allows retrieval of request details", async function () {
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      const id = requestId(request)
      expect(await marketplace.getRequest(id)).to.be.request(request)
    })

    it("rejects request with invalid client address", async function () {
      let invalid = { ...request, client: host.address }
      await token.approve(marketplace.address, maxPrice(invalid))
      await expect(marketplace.requestStorage(invalid)).to.be.revertedWith(
        "Marketplace_InvalidClientAddress"
      )
    })

    it("rejects request with duration exceeding limit", async function () {
      request.ask.duration = config.requestDurationLimit + 1
      await token.approve(marketplace.address, collateralPerSlot(request))
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_DurationExceedsLimit"
      )
    })

    it("rejects request with insufficient payment", async function () {
      let insufficient = maxPrice(request) - 1
      await token.approve(marketplace.address, insufficient)
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "ERC20InsufficientAllowance"
      )
    })

    it("rejects request when expiry out of bounds", async function () {
      await token.approve(marketplace.address, maxPrice(request))

      request.expiry = request.ask.duration + 1
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InvalidExpiry"
      )

      request.expiry = 0
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InvalidExpiry"
      )
    })

    it("is rejected with insufficient slots ", async function () {
      request.ask.slots = 0
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InsufficientSlots"
      )
    })

    it("is rejected when maxSlotLoss exceeds slots", async function () {
      request.ask.maxSlotLoss = request.ask.slots + 1
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InvalidMaxSlotLoss"
      )
    })

    it("rejects resubmission of request", async function () {
      await token.approve(marketplace.address, maxPrice(request) * 2)
      await marketplace.requestStorage(request)
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_RequestAlreadyExists"
      )
    })

    it("is rejected when insufficient duration", async function () {
      request.ask.duration = 0
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        // request.expiry has to be > 0 and
        // request.expiry < request.ask.duration
        // so request.ask.duration will trigger "Marketplace_InvalidExpiry"
        "Marketplace_InvalidExpiry"
      )
    })

    it("is rejected when insufficient proofProbability", async function () {
      request.ask.proofProbability = 0
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InsufficientProofProbability"
      )
    })

    it("is rejected when insufficient collateral", async function () {
      request.ask.collateralPerByte = 0
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InsufficientCollateral"
      )
    })

    it("is rejected when insufficient reward", async function () {
      request.ask.pricePerBytePerSecond = 0
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InsufficientReward"
      )
    })

    it("is rejected when cid is missing", async function () {
      request.content.cid = []
      await expect(marketplace.requestStorage(request)).to.be.revertedWith(
        "Marketplace_InvalidCid"
      )
    })
  })

  describe("filling a slot with collateral", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      await token.approve(marketplace.address, collateralPerSlot(request))
    })

    it("emits event when slot is filled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await expect(marketplace.fillSlot(slot.request, slot.index, proof))
        .to.emit(marketplace, "SlotFilled")
        .withArgs(slot.request, slot.index)
    })

    it("allows retrieval of host that filled slot", async function () {
      expect(await marketplace.getHost(slotId(slot))).to.equal(AddressZero)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      expect(await marketplace.getHost(slotId(slot))).to.equal(host.address)
    })

    it("gives discount on the collateral for repaired slot", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.slotState(slotId(slot))).to.equal(
        SlotState.Repair
      )

      // We need to advance the time to next period, because filling slot
      // must not be done in the same period as for that period there was already proof
      // submitted with the previous `fillSlot` and the transaction would revert with "Proof already submitted".
      await advanceTime(config.proofs.period + 1)

      const startBalance = await token.balanceOf(host.address)
      const collateral = collateralPerSlot(request)
      const discountedCollateral =
        collateral -
        Math.round(
          (collateral * config.collateral.repairRewardPercentage) / 100
        )
      await token.approve(marketplace.address, discountedCollateral)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      const endBalance = await token.balanceOf(host.address)
      expect(startBalance - endBalance).to.equal(discountedCollateral)
      expect(await marketplace.slotState(slotId(slot))).to.equal(
        SlotState.Filled
      )
    })

    it("fails to retrieve a request of an empty slot", async function () {
      expect(marketplace.getActiveSlot(slotId(slot))).to.be.revertedWith(
        "Marketplace_SlotIsFree"
      )
    })

    it("allows retrieval of request of a filled slot", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      let activeSlot = await marketplace.getActiveSlot(slotId(slot))
      expect(activeSlot.request).to.be.request(request)
      expect(activeSlot.slotIndex).to.equal(slot.index)
    })

    it("is rejected when proof is incorrect", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await expect(
        marketplace.fillSlot(slot.request, slot.index, invalidProof())
      ).to.be.revertedWith("Proofs_InvalidProof")
    })

    it("is rejected when slot already filled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await expect(
        marketplace.fillSlot(slot.request, slot.index, proof)
      ).to.be.revertedWith("Marketplace_SlotNotFree")
    })

    it("is rejected when request is unknown", async function () {
      let unknown = await exampleRequest()
      await expect(
        marketplace.fillSlot(requestId(unknown), 0, proof)
      ).to.be.revertedWith("Marketplace_UnknownRequest")
    })

    it("is rejected when request is cancelled", async function () {
      switchAccount(client)
      let expired = { ...request, expiry: hours(1) + 1 }
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(expired)
      await waitUntilCancelled(marketplace, expired)
      switchAccount(host)
      await marketplace.reserveSlot(requestId(expired), slot.index)
      await expect(
        marketplace.fillSlot(requestId(expired), slot.index, proof)
      ).to.be.revertedWith("Marketplace_SlotNotFree")
    })

    it("is rejected when request is finished", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, slot.request)
      await expect(
        marketplace.fillSlot(slot.request, slot.index, proof)
      ).to.be.revertedWith("Marketplace_SlotNotFree")
    })

    it("is rejected when request is failed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFailed(marketplace, request)
      await expect(
        marketplace.fillSlot(slot.request, slot.index, proof)
      ).to.be.revertedWith("Marketplace_SlotNotFree")
    })

    it("is rejected when slot index not in range", async function () {
      const invalid = request.ask.slots
      await expect(
        marketplace.fillSlot(slot.request, invalid, proof)
      ).to.be.revertedWith("Marketplace_InvalidSlot")
    })

    it("fails when all slots are already filled", async function () {
      const lastSlot = request.ask.slots - 1
      await token.approve(
        marketplace.address,
        collateralPerSlot(request) * lastSlot
      )
      await token.approve(marketplace.address, maxPrice(request) * lastSlot)
      for (let i = 0; i <= lastSlot; i++) {
        await marketplace.reserveSlot(slot.request, i)
        await marketplace.fillSlot(slot.request, i, proof)
      }
      await expect(
        marketplace.fillSlot(slot.request, lastSlot, proof)
      ).to.be.revertedWith("Marketplace_SlotNotFree")
    })

    it("fails if slot is not reserved first", async function () {
      await expect(
        marketplace.fillSlot(slot.request, slot.index, proof)
      ).to.be.revertedWith("Marketplace_ReservationRequired")
    })
  })

  describe("filling slot without collateral", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
    })

    it("is rejected when approved collateral is insufficient", async function () {
      let insufficient = collateralPerSlot(request) - 1
      await token.approve(marketplace.address, insufficient)
      await marketplace.reserveSlot(slot.request, slot.index)
      await expect(
        marketplace.fillSlot(slot.request, slot.index, proof)
      ).to.be.revertedWith("ERC20InsufficientAllowance")
    })

    it("collects only requested collateral and not more", async function () {
      await token.approve(marketplace.address, collateralPerSlot(request) * 2)
      const startBalance = await token.balanceOf(host.address)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      const endBalance = await token.balanceOf(host.address)
      expect(startBalance - endBalance).to.eq(collateralPerSlot(request))
    })
  })

  describe("submitting proofs when slot is filled", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await advanceTime(config.proofs.period)
    })

    it("allows proofs to be submitted", async function () {
      await marketplace.submitProof(slotId(slot), proof)
    })

    it("reverts when somebody other then host submit the proof", async function () {
      switchAccount(host2)
      await expect(
        marketplace.submitProof(slotId(slot), proof)
      ).to.be.revertedWith("Marketplace_ProofNotSubmittedByHost")
    })

    it("converts first 31 bytes of challenge to field element", async function () {
      let challenge = arrayify(await marketplace.getChallenge(slotId(slot)))
      let truncated = challenge.slice(0, 31)
      let littleEndian = new Uint8Array(truncated).reverse()
      let expected = BigNumber.from(littleEndian)
      expect(await marketplace.challengeToFieldElement(challenge)).to.equal(
        expected
      )
    })

    it("converts merkle root to field element", async function () {
      let merkleRoot = request.content.merkleRoot
      let littleEndian = new Uint8Array(merkleRoot).reverse()
      let expected = BigNumber.from(littleEndian)
      expect(await marketplace.merkleRootToFieldElement(merkleRoot)).to.equal(
        expected
      )
    })
  })

  describe("request end", function () {
    var requestTime
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      requestTime = await currentTime()
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("sets the request end time to now + duration", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await expect(
        (await marketplace.requestEnd(requestId(request))).toNumber()
      ).to.equal(requestTime + request.ask.duration)
    })

    it("sets request end time to the past once failed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFailed(marketplace, request)
      const now = await currentTime()
      await expect(await marketplace.requestEnd(requestId(request))).to.be.eq(
        now - 1
      )
    })

    it("sets request end time to the past once cancelled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      const now = await currentTime()
      await expect(await marketplace.requestEnd(requestId(request))).to.be.eq(
        now - 1
      )
    })

    it("checks that request end time is in the past once finished", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      const now = await currentTime()
      await expect(await marketplace.requestEnd(requestId(request))).to.be.eq(
        now - 1
      )
    })
  })

  describe("freeing a slot", function () {
    let id

    beforeEach(async function () {
      slot.index = 0
      id = slotId(slot)

      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("fails to free slot when slot not filled", async function () {
      slot.index = 5
      let nonExistentId = slotId(slot)
      await expect(marketplace.freeSlot(nonExistentId)).to.be.revertedWith(
        "Marketplace_SlotIsFree"
      )
    })

    it("can only be freed by the host occupying the slot", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      switchAccount(client)
      await expect(marketplace.freeSlot(id)).to.be.revertedWith(
        "Marketplace_InvalidSlotHost"
      )
    })

    it("successfully frees slot", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await expect(marketplace.freeSlot(id)).not.to.be.reverted
    })

    it("emits event once slot is freed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await expect(await marketplace.freeSlot(id))
        .to.emit(marketplace, "SlotFreed")
        .withArgs(slot.request, slot.index)
    })
  })

  describe("paying out a slot", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("finished request pays out reward based on time hosted", async function () {
      // We are advancing the time because most of the slots will be filled somewhere
      // in the "expiry window" and not at its beginning. This is more "real" setup
      // and demonstrates the partial payout feature better.
      await advanceTime(request.expiry / 2)

      const expectedPayouts = await waitUntilStarted(
        marketplace,
        request,
        proof,
        token
      )
      await waitUntilFinished(marketplace, requestId(request))

      const startBalanceHost = await token.balanceOf(host.address)
      await marketplace.freeSlot(slotId(slot))
      const endBalanceHost = await token.balanceOf(host.address)

      expect(expectedPayouts[slot.index]).to.be.lt(maxPrice(request))
      const collateral = collateralPerSlot(request)
      expect(endBalanceHost - startBalanceHost).to.equal(
        expectedPayouts[slot.index] + collateral
      )
    })

    it("returns collateral to host collateral address if specified", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))

      const startBalanceHost = await token.balanceOf(host.address)
      const startBalanceCollateral = await token.balanceOf(
        hostCollateralRecipient.address
      )

      const collateralToBeReturned = await marketplace.currentCollateral(
        slotId(slot)
      )

      await marketplace.freeSlot(
        slotId(slot),
        hostRewardRecipient.address,
        hostCollateralRecipient.address
      )

      const endBalanceCollateral = await token.balanceOf(
        hostCollateralRecipient.address
      )

      const endBalanceHost = await token.balanceOf(host.address)
      expect(endBalanceHost).to.equal(startBalanceHost)
      expect(endBalanceCollateral - startBalanceCollateral).to.equal(
        collateralPerSlot(request)
      )
      expect(collateralToBeReturned).to.equal(collateralPerSlot(request))
    })

    it("pays reward to host reward address if specified", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))

      const startBalanceHost = await token.balanceOf(host.address)
      const startBalanceReward = await token.balanceOf(
        hostRewardRecipient.address
      )

      await marketplace.freeSlot(
        slotId(slot),
        hostRewardRecipient.address,
        hostCollateralRecipient.address
      )

      const endBalanceHost = await token.balanceOf(host.address)
      const endBalanceReward = await token.balanceOf(
        hostRewardRecipient.address
      )

      expect(endBalanceHost).to.equal(startBalanceHost)
      expect(endBalanceReward - startBalanceReward).to.gt(0)
    })

    it("pays the host when contract was cancelled", async function () {
      // Lets advance the time more into the expiry window
      const filledAt = (await currentTime()) + Math.floor(request.expiry / 3)
      const expiresAt = (
        await marketplace.requestExpiry(requestId(request))
      ).toNumber()

      await marketplace.reserveSlot(slot.request, slot.index)
      await setNextBlockTimestamp(filledAt)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      await marketplace.freeSlot(slotId(slot))

      const expectedPartialPayout =
        (expiresAt - filledAt) * pricePerSlotPerSecond(request)
      const endBalance = await token.balanceOf(host.address)
      expect(endBalance - ACCOUNT_STARTING_BALANCE).to.be.equal(
        expectedPartialPayout
      )
    })

    it("pays to host reward address when contract was cancelled, and returns collateral to host address", async function () {
      // Lets advance the time more into the expiry window
      const filledAt = (await currentTime()) + Math.floor(request.expiry / 3)
      const expiresAt = (
        await marketplace.requestExpiry(requestId(request))
      ).toNumber()

      await marketplace.reserveSlot(slot.request, slot.index)
      await setNextBlockTimestamp(filledAt)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      const startBalanceHost = await token.balanceOf(host.address)
      const startBalanceReward = await token.balanceOf(
        hostRewardRecipient.address
      )
      const startBalanceCollateral = await token.balanceOf(
        hostCollateralRecipient.address
      )

      const collateralToBeReturned = await marketplace.currentCollateral(
        slotId(slot)
      )

      await marketplace.freeSlot(
        slotId(slot),
        hostRewardRecipient.address,
        hostCollateralRecipient.address
      )

      const expectedPartialPayout =
        (expiresAt - filledAt) * pricePerSlotPerSecond(request)

      const endBalanceReward = await token.balanceOf(
        hostRewardRecipient.address
      )
      expect(endBalanceReward - startBalanceReward).to.be.equal(
        expectedPartialPayout
      )

      const endBalanceHost = await token.balanceOf(host.address)
      expect(endBalanceHost).to.be.equal(startBalanceHost)

      const endBalanceCollateral = await token.balanceOf(
        hostCollateralRecipient.address
      )
      expect(endBalanceCollateral - startBalanceCollateral).to.be.equal(
        collateralPerSlot(request)
      )

      expect(collateralToBeReturned).to.be.equal(collateralPerSlot(request))
    })

    it("does not pay when the contract hasn't ended", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      const startBalanceHost = await token.balanceOf(host.address)
      const startBalanceReward = await token.balanceOf(
        hostRewardRecipient.address
      )
      const startBalanceCollateral = await token.balanceOf(
        hostCollateralRecipient.address
      )
      await marketplace.freeSlot(slotId(slot))
      const endBalanceHost = await token.balanceOf(host.address)
      const endBalanceReward = await token.balanceOf(
        hostRewardRecipient.address
      )
      const endBalanceCollateral = await token.balanceOf(
        hostCollateralRecipient.address
      )
      expect(endBalanceHost).to.equal(startBalanceHost)
      expect(endBalanceReward).to.equal(startBalanceReward)
      expect(endBalanceCollateral).to.equal(startBalanceCollateral)
    })

    it("can only be done once", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      await marketplace.freeSlot(slotId(slot))
      await expect(marketplace.freeSlot(slotId(slot))).to.be.revertedWith(
        "Marketplace_AlreadyPaid"
      )
    })

    it("cannot be filled again", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      await marketplace.freeSlot(slotId(slot))
      await expect(marketplace.fillSlot(slot.request, slot.index, proof)).to.be
        .reverted
    })
  })

  describe("fulfilling a request", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("emits event when all slots are filled", async function () {
      const lastSlot = request.ask.slots - 1
      await token.approve(
        marketplace.address,
        collateralPerSlot(request) * lastSlot
      )
      for (let i = 0; i < lastSlot; i++) {
        await marketplace.reserveSlot(slot.request, i)
        await marketplace.fillSlot(slot.request, i, proof)
      }

      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
      await marketplace.reserveSlot(slot.request, lastSlot)
      await expect(marketplace.fillSlot(slot.request, lastSlot, proof))
        .to.emit(marketplace, "RequestFulfilled")
        .withArgs(requestId(request))
    })
    it("sets state when all slots are filled", async function () {
      const slots = request.ask.slots
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral * slots)
      for (let i = 0; i < slots; i++) {
        await marketplace.reserveSlot(slot.request, i)
        await marketplace.fillSlot(slot.request, i, proof)
      }
      await expect(await marketplace.requestState(slot.request)).to.equal(
        RequestState.Started
      )
    })
    it("fails when all slots are already filled", async function () {
      const lastSlot = request.ask.slots - 1
      await token.approve(
        marketplace.address,
        collateralPerSlot(request) * (lastSlot + 1)
      )
      for (let i = 0; i <= lastSlot; i++) {
        await marketplace.reserveSlot(slot.request, i)
        await marketplace.fillSlot(slot.request, i, proof)
      }
      await expect(
        marketplace.fillSlot(slot.request, lastSlot, proof)
      ).to.be.revertedWith("Marketplace_SlotNotFree")
    })
  })

  describe("withdrawing funds", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)

      // wait a bit, so that there are funds for the client to withdraw
      await advanceTime(10)

      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("rejects withdraw when request not yet timed out", async function () {
      switchAccount(client)
      await expect(
        marketplace.withdrawFunds(slot.request, clientWithdrawRecipient.address)
      ).to.be.revertedWith("Marketplace_InvalidState")
    })

    it("rejects withdraw when wrong account used", async function () {
      await waitUntilCancelled(marketplace, request)
      await expect(
        marketplace.withdrawFunds(slot.request, clientWithdrawRecipient.address)
      ).to.be.revertedWith("Marketplace_InvalidClientAddress")
    })

    it("rejects withdraw when in wrong state", async function () {
      // fill all slots, should change state to RequestState.Started
      const lastSlot = request.ask.slots - 1
      await token.approve(
        marketplace.address,
        collateralPerSlot(request) * (lastSlot + 1)
      )
      for (let i = 0; i <= lastSlot; i++) {
        await marketplace.reserveSlot(slot.request, i)
        await marketplace.fillSlot(slot.request, i, proof)
      }
      await waitUntilCancelled(marketplace, request)
      switchAccount(client)
      await expect(
        marketplace.withdrawFunds(slot.request, clientWithdrawRecipient.address)
      ).to.be.revertedWith("Marketplace_InvalidState")
    })

    it("rejects withdraw when already withdrawn", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))

      switchAccount(client)
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )
      await expect(
        marketplace.withdrawFunds(slot.request, clientWithdrawRecipient.address)
      ).to.be.revertedWith("Marketplace_NothingToWithdraw")
    })

    it("emits event once request is cancelled", async function () {
      await waitUntilCancelled(marketplace, request)
      switchAccount(client)
      await expect(
        marketplace.withdrawFunds(slot.request, clientWithdrawRecipient.address)
      )
        .to.emit(marketplace, "RequestCancelled")
        .withArgs(requestId(request))
    })

    it("withdraw rest of funds to the client payout address for finished requests", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))

      switchAccount(client)
      const startBalanceClient = await token.balanceOf(client.address)
      const startBalancePayout = await token.balanceOf(
        clientWithdrawRecipient.address
      )
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )

      const endBalanceClient = await token.balanceOf(client.address)
      const endBalancePayout = await token.balanceOf(
        clientWithdrawRecipient.address
      )

      expect(endBalanceClient).to.equal(startBalanceClient)
      // As all the request's slots will get filled and request will start and successfully finishes,
      // then the upper bound to how much the client gets returned is the cumulative reward for all the
      // slots for expiry window. This limit is "inclusive" because it is possible that all slots are filled
      // at the time of expiry and hence the user would get the full "expiry window" reward back.
      expect(endBalancePayout - startBalancePayout).to.be.gt(0)
      expect(endBalancePayout - startBalancePayout).to.be.lte(
        request.expiry * pricePerSlotPerSecond(request)
      )
    })

    it("withdraws to the client payout address when request is cancelled", async function () {
      await waitUntilCancelled(marketplace, request)
      switchAccount(client)
      const startBalanceClient = await token.balanceOf(client.address)
      const startBalancePayout = await token.balanceOf(
        clientWithdrawRecipient.address
      )
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )
      const endBalanceClient = await token.balanceOf(client.address)
      const endBalancePayout = await token.balanceOf(
        clientWithdrawRecipient.address
      )
      expect(endBalanceClient).to.equal(startBalanceClient)
      expect(endBalancePayout - startBalancePayout).to.equal(maxPrice(request))
    })

    it("withdraws full price for failed requests to the client payout address", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFailed(marketplace, request)

      switchAccount(client)

      const startBalanceClient = await token.balanceOf(client.address)
      const startBalancePayout = await token.balanceOf(
        clientWithdrawRecipient.address
      )
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )

      const endBalanceClient = await token.balanceOf(client.address)
      const endBalancePayout = await token.balanceOf(
        clientWithdrawRecipient.address
      )

      expect(endBalanceClient).to.equal(startBalanceClient)
      expect(endBalancePayout - startBalancePayout).to.equal(maxPrice(request))
    })

    it("withdraws to the client payout address for cancelled requests lowered by hosts payout", async function () {
      // Lets advance the time more into the expiry window
      const filledAt = (await currentTime()) + Math.floor(request.expiry / 3)
      const expiresAt = (
        await marketplace.requestExpiry(requestId(request))
      ).toNumber()

      await marketplace.reserveSlot(slot.request, slot.index)
      await setNextBlockTimestamp(filledAt)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      const expectedPartialhostRewardRecipient =
        (expiresAt - filledAt) * pricePerSlotPerSecond(request)

      switchAccount(client)
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )
      const endBalance = await token.balanceOf(clientWithdrawRecipient.address)
      expect(endBalance - ACCOUNT_STARTING_BALANCE).to.equal(
        maxPrice(request) - expectedPartialhostRewardRecipient
      )
    })

    it("when slot is freed and not repaired, client will get refunded the freed slot's funds", async function () {
      const payouts = await waitUntilStarted(marketplace, request, proof, token)

      await expect(marketplace.freeSlot(slotId(slot))).to.emit(
        marketplace,
        "SlotFreed"
      )
      await waitUntilFinished(marketplace, requestId(request))

      switchAccount(client)
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )
      const endBalance = await token.balanceOf(clientWithdrawRecipient.address)
      expect(endBalance - ACCOUNT_STARTING_BALANCE).to.equal(
        maxPrice(request) -
          payouts.reduce((a, b) => a + b, 0) + // This is the amount that user gets refunded for filling period in expiry window
          payouts[slot.index] // This is the refunded amount for the freed slot
      )
    })
  })

  describe("request state", function () {
    const { New, Cancelled, Started, Failed, Finished } = RequestState

    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("is 'New' initially", async function () {
      expect(await marketplace.requestState(slot.request)).to.equal(New)
    })

    it("changes to 'Cancelled' once request is cancelled", async function () {
      await waitUntilCancelled(marketplace, request)
      expect(await marketplace.requestState(slot.request)).to.equal(Cancelled)
    })

    it("remains 'Cancelled' when client withdraws funds", async function () {
      await waitUntilCancelled(marketplace, request)
      switchAccount(client)
      await marketplace.withdrawFunds(
        slot.request,
        clientWithdrawRecipient.address
      )
      expect(await marketplace.requestState(slot.request)).to.equal(Cancelled)
    })

    it("changes to 'Started' once all slots are filled", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      expect(await marketplace.requestState(slot.request)).to.equal(Started)
    })

    it("changes to 'Failed' once too many slots are freed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFailed(marketplace, request)
      expect(await marketplace.requestState(slot.request)).to.equal(Failed)
    })

    it("does not change to 'Failed' before it is started", async function () {
      await token.approve(
        marketplace.address,
        collateralPerSlot(request) * (request.ask.maxSlotLoss + 1)
      )
      for (let i = 0; i <= request.ask.maxSlotLoss; i++) {
        await marketplace.reserveSlot(slot.request, i)
        await marketplace.fillSlot(slot.request, i, proof)
      }
      for (let i = 0; i <= request.ask.maxSlotLoss; i++) {
        slot.index = i
        let id = slotId(slot)
        await marketplace.forciblyFreeSlot(id)
      }
      expect(await marketplace.requestState(slot.request)).to.equal(New)
    })

    it("changes to 'Finished' when the request ends", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      expect(await marketplace.requestState(slot.request)).to.equal(Finished)
    })

    it("remains 'Finished' once a slot is paid out", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.requestState(slot.request)).to.equal(Finished)
    })
  })

  describe("slot state", function () {
    const { Free, Filled, Finished, Failed, Paid, Cancelled, Repair } =
      SlotState
    let period, periodEnd

    beforeEach(async function () {
      period = config.proofs.period
      ;({ periodOf, periodEnd } = periodic(period))

      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    async function waitUntilProofIsRequired(id) {
      await advanceTimeTo(periodEnd(periodOf(await currentTime())))
      while (
        !(
          (await marketplace.isProofRequired(id)) &&
          (await marketplace.getPointer(id)) < 250
        )
      ) {
        await advanceTime(period)
      }
    }

    it("is 'Free' initially", async function () {
      expect(await marketplace.slotState(slotId(slot))).to.equal(Free)
    })

    it("changes to 'Filled' when slot is filled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      expect(await marketplace.slotState(slotId(slot))).to.equal(Filled)
    })

    it("changes to 'Finished' when request finishes", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, slot.request)
      expect(await marketplace.slotState(slotId(slot))).to.equal(Finished)
    })

    it("changes to 'Cancelled' when request is cancelled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      expect(await marketplace.slotState(slotId(slot))).to.equal(Cancelled)
    })

    it("changes to 'Repair' when host frees the slot", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.slotState(slotId(slot))).to.equal(Repair)
    })

    it("changes to 'Repair' when too many proofs are missed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      while ((await marketplace.slotState(slotId(slot))) === Filled) {
        await waitUntilProofIsRequired(slotId(slot))
        const missedPeriod = periodOf(await currentTime())
        await advanceTime(period + 1)
        await marketplace.markProofAsMissing(slotId(slot), missedPeriod)
      }
      expect(await marketplace.slotState(slotId(slot))).to.equal(Repair)
    })

    it("changes to 'Failed' when request fails", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilSlotFailed(marketplace, request, slot)
      expect(await marketplace.slotState(slotId(slot))).to.equal(Failed)
    })

    it("changes to 'Paid' when host has been paid", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, slot.request)
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.slotState(slotId(slot))).to.equal(Paid)
    })
  })

  describe("slot probability", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("calculates correctly the slot probability", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)

      // request.ask.proofProbability  = 4
      // config.proofs.downtime = 64
      // 4 * (256 - 64) / 256
      const expectedProbability = 3
      expect(await marketplace.slotProbability(slotId(slot))).to.equal(
        expectedProbability
      )
    })
  })

  describe("proof requirements", function () {
    let period, periodOf, periodEnd

    beforeEach(async function () {
      period = config.proofs.period
      ;({ periodOf, periodEnd } = periodic(period))

      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    async function waitUntilProofWillBeRequired(id) {
      while (!(await marketplace.willProofBeRequired(id))) {
        await advanceTime(period)
      }
    }

    async function waitUntilProofIsRequired(id) {
      await advanceTimeTo(periodEnd(periodOf(await currentTime())))
      while (
        !(
          (await marketplace.isProofRequired(id)) &&
          (await marketplace.getPointer(id)) < 250
        )
      ) {
        await advanceTime(period)
      }
    }

    it("requires proofs when slot is filled", async function () {
      const id = slotId(slot)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilProofWillBeRequired(id)
    })

    it("will not require proofs once cancelled", async function () {
      const id = slotId(slot)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilProofWillBeRequired(id)
      await expect(await marketplace.willProofBeRequired(id)).to.be.true
      await waitUntilCancelled(marketplace, request)
      await expect(await marketplace.willProofBeRequired(id)).to.be.false
    })

    it("does not require proofs once cancelled", async function () {
      const id = slotId(slot)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilProofIsRequired(id)
      await expect(await marketplace.isProofRequired(id)).to.be.true
      await waitUntilCancelled(marketplace, request)
      await expect(await marketplace.isProofRequired(id)).to.be.false
    })

    it("does not provide challenges once cancelled", async function () {
      const id = slotId(slot)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilProofIsRequired(id)
      const challenge1 = await marketplace.getChallenge(id)
      expect(BigNumber.from(challenge1).gt(0))
      await waitUntilCancelled(marketplace, request)
      const challenge2 = await marketplace.getChallenge(id)
      expect(BigNumber.from(challenge2).isZero())
    })

    it("does not provide pointer once cancelled", async function () {
      const id = slotId(slot)
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilProofIsRequired(id)
      const challenge1 = await marketplace.getChallenge(id)
      expect(BigNumber.from(challenge1).gt(0))
      await waitUntilCancelled(marketplace, request)
      const challenge2 = await marketplace.getChallenge(id)
      expect(BigNumber.from(challenge2).isZero())
    })
  })

  describe("missing proofs", function () {
    let period, periodOf, periodEnd

    beforeEach(async function () {
      period = config.proofs.period
      ;({ periodOf, periodEnd } = periodic(period))

      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    async function waitUntilProofIsRequired(id) {
      await advanceTimeTo(periodEnd(periodOf(await currentTime())))
      while (
        !(
          (await marketplace.isProofRequired(id)) &&
          (await marketplace.getPointer(id)) < 250
        )
      ) {
        await advanceTime(period)
      }
    }

    it("fails to mark proof as missing when cancelled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      let missedPeriod = periodOf(await currentTime())
      await expect(
        marketplace.markProofAsMissing(slotId(slot), missedPeriod)
      ).to.be.revertedWith("Marketplace_SlotNotAcceptingProofs")
    })

    describe("slashing when missing proofs", function () {
      it("reduces collateral when a proof is missing", async function () {
        const id = slotId(slot)
        const { slashPercentage } = config.collateral
        await marketplace.reserveSlot(slot.request, slot.index)
        await marketplace.fillSlot(slot.request, slot.index, proof)

        await waitUntilProofIsRequired(id)
        let missedPeriod = periodOf(await currentTime())
        await advanceTime(period + 1)
        await marketplace.markProofAsMissing(id, missedPeriod)

        const collateral = collateralPerSlot(request)
        const expectedBalance = Math.round(
          (collateral * (100 - slashPercentage)) / 100
        )

        expect(
          BigNumber.from(expectedBalance).eq(
            await marketplace.getSlotCollateral(id)
          )
        )
      })

      it("rewards validator when marking proof as missing", async function () {
        const id = slotId(slot)
        const { slashPercentage, validatorRewardPercentage } = config.collateral
        await marketplace.reserveSlot(slot.request, slot.index)
        await marketplace.fillSlot(slot.request, slot.index, proof)

        switchAccount(validatorRecipient)

        const startBalance = await token.balanceOf(validatorRecipient.address)

        await waitUntilProofIsRequired(id)
        let missedPeriod = periodOf(await currentTime())
        await advanceTime(period + 1)
        await marketplace.markProofAsMissing(id, missedPeriod)

        const endBalance = await token.balanceOf(validatorRecipient.address)

        const collateral = collateralPerSlot(request)
        const slashedAmount = (collateral * slashPercentage) / 100

        const expectedReward = Math.round(
          (slashedAmount * validatorRewardPercentage) / 100
        )

        expect(endBalance.toNumber()).to.equal(
          startBalance.toNumber() + expectedReward
        )
      })
    })

    it("frees slot when collateral slashed below minimum threshold", async function () {
      const collateral = collateralPerSlot(request)
      const minimum =
        collateral -
        (collateral *
          config.collateral.maxNumberOfSlashes *
          config.collateral.slashPercentage) /
          100
      await waitUntilStarted(marketplace, request, proof, token)
      while ((await marketplace.slotState(slotId(slot))) === SlotState.Filled) {
        expect(await marketplace.getSlotCollateral(slotId(slot))).to.be.gt(
          minimum
        )
        await waitUntilProofIsRequired(slotId(slot))
        const missedPeriod = periodOf(await currentTime())
        await advanceTime(period + 1)
        await marketplace.markProofAsMissing(slotId(slot), missedPeriod)
      }
      expect(await marketplace.slotState(slotId(slot))).to.equal(
        SlotState.Repair
      )
      expect(await marketplace.getSlotCollateral(slotId(slot))).to.be.lte(
        minimum
      )
    })

    it("free slot when minimum reached and resets missed proof counter", async function () {
      const collateral = collateralPerSlot(request)
      const minimum =
        collateral -
        (collateral *
          config.collateral.maxNumberOfSlashes *
          config.collateral.slashPercentage) /
          100
      await waitUntilStarted(marketplace, request, proof, token)
      let missedProofs = 0
      while ((await marketplace.slotState(slotId(slot))) === SlotState.Filled) {
        expect(await marketplace.getSlotCollateral(slotId(slot))).to.be.gt(
          minimum
        )
        await waitUntilProofIsRequired(slotId(slot))
        const missedPeriod = periodOf(await currentTime())
        await advanceTime(period + 1)
        expect(await marketplace.missingProofs(slotId(slot))).to.equal(
          missedProofs
        )
        await marketplace.markProofAsMissing(slotId(slot), missedPeriod)
        missedProofs += 1
      }
      expect(await marketplace.slotState(slotId(slot))).to.equal(
        SlotState.Repair
      )
      expect(await marketplace.missingProofs(slotId(slot))).to.equal(0)
      expect(await marketplace.getSlotCollateral(slotId(slot))).to.be.lte(
        minimum
      )
    })
  })

  describe("list of active requests", function () {
    beforeEach(async function () {
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
    })

    it("adds request to list when requesting storage", async function () {
      await marketplace.requestStorage(request)
      expect(await marketplace.myRequests()).to.deep.equal([requestId(request)])
    })

    it("keeps request in list when cancelled", async function () {
      await marketplace.requestStorage(request)
      await waitUntilCancelled(marketplace, request)
      expect(await marketplace.myRequests()).to.deep.equal([requestId(request)])
    })

    it("removes request from list when funds are withdrawn", async function () {
      await marketplace.requestStorage(request)
      await waitUntilCancelled(marketplace, request)
      await marketplace.withdrawFunds(
        requestId(request),
        clientWithdrawRecipient.address
      )
      expect(await marketplace.myRequests()).to.deep.equal([])
    })

    it("keeps request in list when request fails", async function () {
      await marketplace.requestStorage(request)
      switchAccount(host)
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFailed(marketplace, request)
      switchAccount(client)
      expect(await marketplace.myRequests()).to.deep.equal([requestId(request)])
    })

    it("removes request from list when request finishes", async function () {
      await marketplace.requestStorage(request)
      switchAccount(host)
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      await marketplace.freeSlot(slotId(slot))
      switchAccount(client)
      expect(await marketplace.myRequests()).to.deep.equal([])
    })
  })

  describe("list of active slots", function () {
    beforeEach(async function () {
      switchAccount(client)
      await token.approve(marketplace.address, maxPrice(request))
      await marketplace.requestStorage(request)
      switchAccount(host)
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
    })

    it("adds slot to list when filling slot", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      let slot1 = { ...slot, index: slot.index + 1 }
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
      await marketplace.reserveSlot(slot.request, slot1.index)
      await marketplace.fillSlot(slot.request, slot1.index, proof)
      expect(await marketplace.mySlots()).to.have.members([
        slotId(slot),
        slotId(slot1),
      ])
    })

    it("removes slot from list when slot is freed", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      let slot1 = { ...slot, index: slot.index + 1 }
      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
      await marketplace.reserveSlot(slot.request, slot1.index)
      await marketplace.fillSlot(slot.request, slot1.index, proof)
      await token.approve(marketplace.address, collateral)
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.mySlots()).to.have.members([slotId(slot1)])
    })

    it("keeps slots when cancelled", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      let slot1 = { ...slot, index: slot.index + 1 }

      const collateral = collateralPerSlot(request)
      await token.approve(marketplace.address, collateral)
      await marketplace.reserveSlot(slot.request, slot1.index)
      await marketplace.fillSlot(slot.request, slot1.index, proof)
      await waitUntilCancelled(marketplace, request)
      expect(await marketplace.mySlots()).to.have.members([
        slotId(slot),
        slotId(slot1),
      ])
    })

    it("removes slot when finished slot is freed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilFinished(marketplace, requestId(request))
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.mySlots()).to.not.contain(slotId(slot))
    })

    it("removes slot when cancelled slot is freed", async function () {
      await marketplace.reserveSlot(slot.request, slot.index)
      await marketplace.fillSlot(slot.request, slot.index, proof)
      await waitUntilCancelled(marketplace, request)
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.mySlots()).to.not.contain(slotId(slot))
    })

    it("removes slot when failed slot is freed", async function () {
      await waitUntilStarted(marketplace, request, proof, token)
      await waitUntilSlotFailed(marketplace, request, slot)
      await marketplace.freeSlot(slotId(slot))
      expect(await marketplace.mySlots()).to.not.contain(slotId(slot))
    })
  })
})