Test for entities after TransferEvent (#196)

* Add resolver for Position entity in uni-info-watcher.

* Test for entities after TransferEvent.

Co-authored-by: prathamesh0 <prathamesh.musale0@gmail.com>

packages/uni-info-watcher/.mocharc.yml

@@ -1,4 +1,4 @@
-timeout: '50000'
+timeout: '60000'
 bail: true
 exit: true # TODO: Find out why the program doesn't exit on its own.
 require: 'ts-node/register'

packages/uni-info-watcher/src/indexer.ts

@@ -1139,7 +1139,7 @@ export class Indexer {
 
         const [token0, token1] = await Promise.all([
           this._db.getTokenNoTx({ id: token0Address, blockHash }),
-          this._db.getTokenNoTx({ id: token0Address, blockHash })
+          this._db.getTokenNoTx({ id: token1Address, blockHash })
         ]);
         assert(token0 && token1);
         position.token0 = token0;

packages/uni-info-watcher/src/resolvers.ts

@@ -16,6 +16,7 @@ import { TokenDayData } from './entity/TokenDayData';
 import { TokenHourData } from './entity/TokenHourData';
 import { Transaction } from './entity/Transaction';
 import { UniswapDayData } from './entity/UniswapDayData';
+import { Position } from './entity/Position';
 
 const log = debug('vulcanize:resolver');
 
@@ -122,6 +123,12 @@ export const createResolvers = async (indexer: Indexer): Promise<any> => {
         log('uniswapDayDatas', first, skip, orderBy, orderDirection, where);
 
         return indexer.getEntities(UniswapDayData, {}, where, { limit: first, skip, orderBy, orderDirection });
+      },
+
+      positions: async (_: any, { first, where }: { first: number, where: { [key: string]: any } }) => {
+        log('uniswapDayDatas', first, where);
+
+        return indexer.getEntities(Position, {}, where, { limit: first }, ['pool', 'token0', 'token1', 'tickLower', 'tickUpper', 'transaction']);
       }
     }
   };

packages/uni-info-watcher/src/schema.ts

@@ -138,6 +138,24 @@ type TokenHourData {
   periodStartUnix: Int!
 }
 
+type Position {
+  id: ID!
+  pool: Pool!
+  token0: Token!
+  token1: Token!
+  tickLower: Tick!
+  tickUpper: Tick!
+  transaction: Transaction!
+  liquidity: BigInt!
+  depositedToken0: BigDecimal!
+  depositedToken1: BigDecimal!
+  collectedFeesToken0: BigDecimal!
+  collectedFeesToken1: BigDecimal!
+  owner: Bytes!
+  feeGrowthInside0LastX128: BigInt!
+  feeGrowthInside1LastX128: BigInt!
+}
+
 enum OrderDirection {
   asc
   desc
@@ -242,6 +260,10 @@ enum TokenHourData_orderBy {
   periodStartUnix
 }
 
+input Position_filter {
+  id: ID
+}
+
 type Query {
   bundle(
     id: ID!
@@ -382,5 +404,10 @@ type Query {
     orderDirection: OrderDirection
     where: UniswapDayData_filter
   ): [UniswapDayData!]!
+
+  positions(
+    first: Int = 100
+    where: Position_filter
+  ): [Position!]!
 }
 `;

packages/uni-info-watcher/src/smoke.test.ts

@@ -1,5 +1,5 @@
 import { expect } from 'chai';
-import { ethers, Contract, Signer } from 'ethers';
+import { ethers, Contract, Signer, constants } from 'ethers';
 import { request } from 'graphql-request';
 import 'mocha';
 import _ from 'lodash';
@@ -18,7 +18,8 @@ import {
   initializePool,
   getMinTick,
   getMaxTick,
-  approveToken
+  approveToken,
+  NFPM_ABI
 } from '@vulcanize/util/test';
 import { Client as UniClient, watchEvent } from '@vulcanize/uni-watcher';
 import {
@@ -37,7 +38,8 @@ import {
   queryMints,
   queryTicks,
   queryBurns,
-  querySwaps
+  querySwaps,
+  queryPositions
 } from '../test/queries';
 import {
   checkUniswapDayData,
@@ -57,6 +59,7 @@ describe('uni-info-watcher', () => {
   let token1: Contract;
   let token0Address: string;
   let token1Address: string;
+  let nfpm: Contract;
 
   let tickLower: number;
   let tickUpper: number;
@@ -105,7 +108,7 @@ describe('uni-info-watcher', () => {
   });
 
   describe('PoolCreatedEvent', () => {
-    // NOTE Skipping checking entity updates that cannot be gotten/derived using queries.
+    // NOTE: Skipping checking entity updates that cannot be gotten/derived using queries.
     // Checked entities: Token, Pool.
 
     const fee = 500;
@@ -135,7 +138,7 @@ describe('uni-info-watcher', () => {
       const eventType = 'PoolCreatedEvent';
       await watchEvent(uniClient, eventType);
 
-      // Sleeping for 10 sec for the entities to be processed.
+      // Sleeping for 10 sec for the event to be processed.
       await wait(10000);
     });
 
@@ -187,13 +190,14 @@ describe('uni-info-watcher', () => {
     });
 
     it('should trigger InitializeEvent', async () => {
+      // Initialize Pool.
       initializePool(pool, sqrtPrice);
 
       // Wait for InitializeEvent.
       const eventType = 'InitializeEvent';
       await watchEvent(uniClient, eventType);
 
-      // Sleeping for 5 sec for the entities to be processed.
+      // Sleeping for 5 sec for the event to be processed.
       await wait(5000);
     });
 
@@ -260,7 +264,7 @@ describe('uni-info-watcher', () => {
       const eventType = 'MintEvent';
       await watchEvent(uniClient, eventType);
 
-      // Sleeping for 20 sec for the entities to be processed.
+      // Sleeping for 20 sec for the event to be processed.
       await wait(20000);
     });
 
@@ -432,7 +436,7 @@ describe('uni-info-watcher', () => {
       const eventType = 'BurnEvent';
       await watchEvent(uniClient, eventType);
 
-      // Sleeping for 15 sec for the entities to be processed.
+      // Sleeping for 15 sec for the event to be processed.
       await wait(15000);
     });
 
@@ -602,7 +606,7 @@ describe('uni-info-watcher', () => {
       const eventType = 'SwapEvent';
       eventValue = await watchEvent(uniClient, eventType);
 
-      // Sleeping for 5 sec for the entities to be processed.
+      // Sleeping for 5 sec for the event to be processed.
       await wait(5000);
     });
 
@@ -703,4 +707,122 @@ describe('uni-info-watcher', () => {
       checkTokenHourData(endpoint, token1.address);
     });
   });
+
+  describe('TransferEvent', () => {
+    // NOTE: The test cases for TransferEvent are written such that IncreaseLiquidityEvent has also been processed right after.
+    // Checked entities: Transaction, Position.
+
+    const fee = 3000;
+    const sqrtPrice = '79228162514264337593543950336';
+    let eventType: string;
+    let eventValue: any;
+    let expectedTxID: string;
+
+    const amount0Desired = 15;
+    const amount1Desired = 15;
+    const amount0Min = 0;
+    const amount1Min = 0;
+    const deadline = 1634367993;
+
+    before(async () => {
+      // Get the NFPM contract.
+      const latestContract = await uniClient.getLatestContract('nfpm');
+      expect(latestContract.address).to.not.be.empty;
+
+      nfpm = new Contract(latestContract.address, NFPM_ABI, signer);
+
+      // Create Pool.
+      createPool(factory, token0Address, token1Address, fee);
+
+      // Wait for PoolCreatedEvent.
+      eventType = 'PoolCreatedEvent';
+      eventValue = await watchEvent(uniClient, eventType);
+
+      // Sleeping for 10 sec for the event to be processed.
+      await wait(10000); // not needed
+
+      // Reinitializing the pool variable.
+      const poolAddress = eventValue.event.pool;
+      pool = new Contract(poolAddress, POOL_ABI, signer);
+      expect(pool.address).to.not.be.empty;
+
+      // Reinitializing the ticks
+      const tickSpacing = await pool.tickSpacing();
+      tickLower = getMinTick(tickSpacing);
+      tickUpper = getMaxTick(tickSpacing);
+
+      // Initialize Pool.
+      initializePool(pool, sqrtPrice);
+
+      // Wait for InitializeEvent.
+      eventType = 'InitializeEvent';
+      await watchEvent(uniClient, eventType);
+
+      // Sleeping for 5 sec for the event to be processed.
+      await wait(5000);
+
+      // Approving tokens for NonfungiblePositionManager contract.
+      await approveToken(token0, nfpm.address, BigInt(constants.MaxUint256.toString()));
+      await approveToken(token1, nfpm.address, BigInt(constants.MaxUint256.toString()));
+    });
+
+    it('should trigger TransferEvent', async () => {
+      nfpm.mint({
+        token0: token0Address,
+        token1: token1Address,
+        tickLower,
+        tickUpper,
+        amount0Desired,
+        amount1Desired,
+        amount0Min,
+        amount1Min,
+        recipient,
+        deadline,
+        fee
+      });
+
+      // Wait for MintEvent.
+      eventType = 'MintEvent';
+      await watchEvent(uniClient, eventType);
+
+      // Wait for TransferEvent.
+      eventType = 'TransferEvent';
+      eventValue = await watchEvent(uniClient, eventType);
+
+      // Wait for IncreaseLiquidityEvent.
+      eventType = 'IncreaseLiquidityEvent';
+      await watchEvent(uniClient, eventType);
+
+      // Sleeping for 15 sec for the events to be processed.
+      await wait(15000);
+    });
+
+    it('should create a Transaction entity', async () => {
+      const eventType = 'MintEvent';
+      ({ expectedTxID } = await checkTransaction(endpoint, eventType));
+    });
+
+    it('should createa a Position entity', async () => {
+      // Checked values: pool, token0, token1, tickLower, tickUpper, transaction, owner.
+      // Unchecked values: feeGrowthInside0LastX128, feeGrowthInside0LastX128.
+
+      // Get the Position using tokenId.
+      const data = await request(endpoint, queryPositions, { id: Number(eventValue.event.tokenId) });
+      expect(data.positions).to.not.be.empty;
+
+      const position = data.positions[0];
+      const positionTickLower = position.tickLower.id.split('#')[1];
+      const positionTickUpper = position.tickUpper.id.split('#')[1];
+
+      const expectedOwner = eventValue.event.to;
+
+      expect(position.pool.id).to.be.equal(pool.address);
+      expect(position.token0.id).to.be.equal(token0.address);
+      expect(position.token1.id).to.be.equal(token1.address);
+      expect(positionTickLower).to.be.equal(tickLower.toString());
+      expect(positionTickUpper).to.be.equal(tickUpper.toString());
+      expect(position.transaction.id).to.be.equal(expectedTxID);
+      expect(position.owner).to.be.equal(expectedOwner);
+    });
+  });
 });

packages/uni-info-watcher/test/queries.ts

@@ -252,3 +252,37 @@ query queryTransactions(
         timestamp
       }
 }`;
+
+// Getting position filtered by id.
+export const queryPositions = gql`
+query queryPositions($first: Int, $id: ID) {
+  positions(first: $first, where: { id: $id }) {
+    id,
+    pool {
+      id
+    },
+    token0 {
+      id
+    },
+    token1 {
+      id
+    },
+    tickLower {
+      id
+    },
+    tickUpper {
+      id
+    },
+    transaction {
+      id
+    },
+    liquidity,
+    depositedToken0,
+    depositedToken1,
+    collectedFeesToken0,
+    collectedFeesToken1,
+    owner,
+    feeGrowthInside0LastX128,
+    feeGrowthInside1LastX128
+  }
+}`;

packages/uni-watcher/.eslintrc.json

@@ -28,8 +28,7 @@
         {
             "files": ["*.test.ts", "test/*.ts"],
             "rules": {
-              "no-unused-expressions": "off",
+              "no-unused-expressions": "off"
-              "no-prototype-builtins": "off"
             }
         }
     ]

packages/uni-watcher/hardhat.config.ts

@@ -7,9 +7,6 @@ const config: HardhatUserConfig = {
     compilers: [
       {
         version: '0.7.6'
-      },
-      {
-        version: '0.5.0'
       }
     ]
   },

packages/uni-watcher/src/client.ts

@@ -1,7 +1,7 @@
 import { gql } from '@apollo/client/core';
 import { GraphQLClient, GraphQLConfig } from '@vulcanize/ipld-eth-client';
 
-import { queryGetPool, queryPoolIdToPoolKey, queryPosition, queryEvents, subscribeEvents } from './queries';
+import { queryGetPool, queryPoolIdToPoolKey, queryPosition, queryEvents, subscribeEvents, queryLatestContract } from './queries';
 
 export class Client {
   _config: GraphQLConfig;
@@ -71,4 +71,15 @@ export class Client {
 
     return getPool;
   }
+
+  async getLatestContract (type: string): Promise<any> {
+    const { latestContract } = await this._client.query(
+      gql(queryLatestContract),
+      {
+        type
+      }
+    );
+
+    return latestContract;
+  }
 }

packages/uni-watcher/src/indexer.ts

@@ -604,4 +604,11 @@ export class Indexer {
       ...mappingKeys
     );
   }
+
+  async getLatestContract (type: string): Promise<any> {
+    const contract = await this._db.getLatestContract(type);
+    assert(contract, `No ${type} contract watched.`);
+
+    return contract;
+  }
 }

packages/uni-watcher/src/queries.ts

@@ -155,3 +155,11 @@ query getPool($blockHash: String!, $token0: String!, $token1: String!, $fee: Str
   }
 }
 `;
+
+export const queryLatestContract = gql`
+query queryLatestContract($type: String!) {
+  latestContract(type: $type) {
+    address
+  }
+}
+`;

packages/uni-watcher/src/resolvers.ts

@@ -89,6 +89,11 @@ export const createResolvers = async (indexer: Indexer, eventWatcher: EventWatch
       getPool: (_: any, { blockHash, token0, token1, fee }: { blockHash: string, token0: string, token1: string, fee: string }) => {
         log('getPool', blockHash, token0, token1, fee);
         return indexer.getPool(blockHash, token0, token1, fee);
+      },
+
+      latestContract: (_: any, { type }: { type: string }) => {
+        log('latestContract', type);
+        return indexer.getLatestContract(type);
       }
     }
   };

packages/uni-watcher/src/schema.ts

@@ -193,6 +193,10 @@ type BlockProgressEvent {
   isComplete: Boolean!
 }
 
+type Contract {
+  address: String!
+}
+
 #
 # Queries
 #
@@ -201,6 +205,10 @@ type Query {
 
   # NonfungiblePositionManager
 
+  latestContract(
+    type: String!
+  ): Contract
+
   position(
     blockHash: String!
     tokenId: String!

packages/uni-watcher/src/smoke.test.ts

@@ -13,7 +13,9 @@ import {
   TICK_MIN,
   getMinTick,
   getMaxTick,
-  approveToken
+  approveToken,
+  deployWETH9Token,
+  deployNFPM
 } from '@vulcanize/util/test';
 import { Client as UniClient } from '@vulcanize/uni-watcher';
 import { getCache } from '@vulcanize/cache';
@@ -25,25 +27,11 @@ import {
 import {
   abi as POOL_ABI
 } from '@uniswap/v3-core/artifacts/contracts/UniswapV3Pool.sol/UniswapV3Pool.json';
-import {
-  abi as NFTD_ABI,
-  bytecode as NFTD_BYTECODE
-} from '@uniswap/v3-periphery/artifacts/contracts/libraries/NFTDescriptor.sol/NFTDescriptor.json';
-import {
-  abi as NFTPD_ABI,
-  bytecode as NFTPD_BYTECODE,
-  linkReferences as NFTPD_LINKREFS
-} from '@uniswap/v3-periphery/artifacts/contracts/NonfungibleTokenPositionDescriptor.sol/NonfungibleTokenPositionDescriptor.json';
-import {
-  abi as NFPM_ABI,
-  bytecode as NFPM_BYTECODE
-} from '@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json';
 
 import { Indexer } from './indexer';
 import { Database } from './database';
 import { watchContract } from './utils/index';
 import {
-  linkLibraries,
   testCreatePool,
   testInitialize,
   checkMintEvent,
@@ -54,10 +42,6 @@ import {
   checkDecreaseLiquidityEvent,
   checksCollectEvent
 } from '../test/utils';
-import {
-  abi as WETH9_ABI,
-  bytecode as WETH9_BYTECODE
-} from '../artifacts/test/contracts/WETH9.sol/WETH9.json';
 
 const NETWORK_RPC_URL = 'http://localhost:8545';
 
@@ -270,47 +254,18 @@ describe('uni-watcher', () => {
 
   it('should deploy a WETH9 token', async () => {
     // Deploy weth9 token.
-    const WETH9 = new ethers.ContractFactory(WETH9_ABI, WETH9_BYTECODE, signer);
+    weth9Address = await deployWETH9Token(signer);
-    const weth9 = await WETH9.deploy();
+    expect(weth9Address).to.not.be.empty;
-
-    weth9Address = weth9.address;
-    expect(weth9.address).to.not.be.empty;
   });
 
   it('should deploy NonfungiblePositionManager', async () => {
     // Deploy NonfungiblePositionManager.
-    // https://github.com/Uniswap/uniswap-v3-periphery/blob/main/test/shared/completeFixture.ts#L31
+    nfpm = await deployNFPM(signer, factory, weth9Address);
-    const nftDescriptorLibraryFactory = new ethers.ContractFactory(NFTD_ABI, NFTD_BYTECODE, signer);
-    const nftDescriptorLibrary = await nftDescriptorLibraryFactory.deploy();
-    expect(nftDescriptorLibrary.address).to.not.be.empty;
-
-    // Linking NFTDescriptor library to NFTPD before deploying.
-    const linkedNFTPDBytecode = linkLibraries({
-      bytecode: NFTPD_BYTECODE,
-      linkReferences: NFTPD_LINKREFS
-    }, {
-      NFTDescriptor: nftDescriptorLibrary.address
-    }
-    );
-
-    const positionDescriptorFactory = new ethers.ContractFactory(
-      NFTPD_ABI,
-      linkedNFTPDBytecode,
-      signer);
-    const nftDescriptor = await positionDescriptorFactory.deploy(weth9Address);
-    expect(nftDescriptor.address).to.not.be.empty;
-
-    const positionManagerFactory = new ethers.ContractFactory(
-      NFPM_ABI,
-      NFPM_BYTECODE,
-      signer);
-    nfpm = await positionManagerFactory.deploy(factory.address, weth9Address, nftDescriptor.address);
-
     expect(nfpm.address).to.not.be.empty;
   });
 
   it('should watch NonfungiblePositionManager contract', async () => {
-    // Watch factory contract.
+    // Watch NFPM contract.
     await watchContract(db, nfpm.address, 'nfpm', 100);
 
     // Verifying with the db.

packages/uni-watcher/test/utils.ts

@@ -1,39 +1,10 @@
-import { ethers, utils, Contract, Signer } from 'ethers';
+import { ethers, Contract, Signer } from 'ethers';
 import { expect } from 'chai';
 import 'mocha';
 
 import { Client as UniClient } from '@vulcanize/uni-watcher';
 import { createPool, initializePool } from '@vulcanize/util/test';
 
-// https://github.com/ethers-io/ethers.js/issues/195
-export const linkLibraries = (
-  {
-    bytecode,
-    linkReferences
-  }: {
-    bytecode: string
-    linkReferences: { [fileName: string]: { [contractName: string]: { length: number; start: number }[] } }
-  },
-  libraries: { [libraryName: string]: string }): string => {
-  Object.keys(linkReferences).forEach((fileName) => {
-    Object.keys(linkReferences[fileName]).forEach((contractName) => {
-      if (!libraries.hasOwnProperty(contractName)) {
-        throw new Error(`Missing link library name ${contractName}`);
-      }
-      const address = utils.getAddress(libraries[contractName]).toLowerCase().slice(2);
-      linkReferences[fileName][contractName].forEach(({ start: byteStart, length: byteLength }) => {
-        const start = 2 + byteStart * 2;
-        const length = byteLength * 2;
-        bytecode = bytecode
-          .slice(0, start)
-          .concat(address)
-          .concat(bytecode.slice(start + length, bytecode.length));
-      });
-    });
-  });
-  return bytecode;
-};
-
 export const testCreatePool = async (
   uniClient: UniClient,
   factory: Contract,
@@ -201,13 +172,13 @@ export const checkTransferEvent = (
   value: any,
   expectedContract: string,
   from: string,
-  recipient: string
+  to: string
 ): void => {
   checkEventCommonValues(value, expectedContract);
 
   expect(value.event.__typename).to.equal('TransferEvent');
   expect(value.event.from).to.equal(from);
-  expect(value.event.to).to.equal(recipient);
+  expect(value.event.to).to.equal(to);
   expect(value.event.tokenId).to.equal('1');
 };
 

packages/util/hardhat.config.ts

@@ -7,6 +7,9 @@ const config: HardhatUserConfig = {
     compilers: [
       {
         version: '0.7.6'
+      },
+      {
+        version: '0.5.0'
       }
     ]
   },

packages/util/test/actions.ts

@@ -1,4 +1,19 @@
-import { ethers, Contract, ContractTransaction, Signer, BigNumber } from 'ethers';
+import { ethers, Contract, ContractTransaction, Signer, BigNumber, utils } from 'ethers';
+import assert from 'assert';
+
+import {
+  abi as NFTD_ABI,
+  bytecode as NFTD_BYTECODE
+} from '@uniswap/v3-periphery/artifacts/contracts/libraries/NFTDescriptor.sol/NFTDescriptor.json';
+import {
+  abi as NFTPD_ABI,
+  bytecode as NFTPD_BYTECODE,
+  linkReferences as NFTPD_LINKREFS
+} from '@uniswap/v3-periphery/artifacts/contracts/NonfungibleTokenPositionDescriptor.sol/NonfungibleTokenPositionDescriptor.json';
+import {
+  abi as NFPM_ABI,
+  bytecode as NFPM_BYTECODE
+} from '@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json';
 
 import {
   abi as TESTERC20_ABI,
@@ -8,7 +23,12 @@ import {
   abi as TESTUNISWAPV3CALLEE_ABI,
   bytecode as TESTUNISWAPV3CALLEE_BYTECODE
 } from '../artifacts/test/contracts/TestUniswapV3Callee.sol/TestUniswapV3Callee.json';
+import {
+  abi as WETH9_ABI,
+  bytecode as WETH9_BYTECODE
+} from '../artifacts/test/contracts/WETH9.sol/WETH9.json';
 
+export { abi as NFPM_ABI } from '@uniswap/v3-periphery/artifacts/contracts/NonfungiblePositionManager.sol/NonfungiblePositionManager.json';
 export { abi as TESTERC20_ABI } from '../artifacts/test/contracts/TestERC20.sol/TestERC20.json';
 
 export const TICK_MIN = -887272;
@@ -57,3 +77,69 @@ export const initializePool = async (pool: Contract, sqrtPrice: string): Promise
   const transaction: ContractTransaction = await pool.initialize(BigNumber.from(sqrtPrice));
   await transaction.wait();
 };
+
+export const deployWETH9Token = async (signer: Signer): Promise<string> => {
+  const WETH9 = new ethers.ContractFactory(WETH9_ABI, WETH9_BYTECODE, signer);
+  const weth9 = await WETH9.deploy();
+
+  return weth9.address;
+};
+
+// https://github.com/ethers-io/ethers.js/issues/195
+const linkLibraries = (
+  {
+    bytecode,
+    linkReferences
+  }: {
+    bytecode: string
+    linkReferences: { [fileName: string]: { [contractName: string]: { length: number; start: number }[] } }
+  },
+  libraries: { [libraryName: string]: string }): string => {
+  Object.keys(linkReferences).forEach((fileName) => {
+    Object.keys(linkReferences[fileName]).forEach((contractName) => {
+      if (!Object.prototype.hasOwnProperty.call(libraries, contractName)) {
+        throw new Error(`Missing link library name ${contractName}`);
+      }
+      const address = utils.getAddress(libraries[contractName]).toLowerCase().slice(2);
+      linkReferences[fileName][contractName].forEach(({ start: byteStart, length: byteLength }) => {
+        const start = 2 + byteStart * 2;
+        const length = byteLength * 2;
+        bytecode = bytecode
+          .slice(0, start)
+          .concat(address)
+          .concat(bytecode.slice(start + length, bytecode.length));
+      });
+    });
+  });
+  return bytecode;
+};
+
+export const deployNFPM = async (signer: Signer, factory: Contract, weth9Address: string): Promise<Contract> => {
+  // Deploy NonfungiblePositionManager.
+  // https://github.com/Uniswap/uniswap-v3-periphery/blob/main/test/shared/completeFixture.ts#L31
+  const nftDescriptorLibraryFactory = new ethers.ContractFactory(NFTD_ABI, NFTD_BYTECODE, signer);
+  const nftDescriptorLibrary = await nftDescriptorLibraryFactory.deploy();
+  assert(nftDescriptorLibrary.address, 'NFTDescriptorLibrary not deployed.');
+
+  // Linking NFTDescriptor library to NFTPD before deploying.
+  const linkedNFTPDBytecode = linkLibraries({
+    bytecode: NFTPD_BYTECODE,
+    linkReferences: NFTPD_LINKREFS
+  }, {
+    NFTDescriptor: nftDescriptorLibrary.address
+  }
+  );
+
+  const positionDescriptorFactory = new ethers.ContractFactory(
+    NFTPD_ABI,
+    linkedNFTPDBytecode,
+    signer);
+  const nftDescriptor = await positionDescriptorFactory.deploy(weth9Address);
+  assert(nftDescriptor.address, 'NFTDescriptor not deployed.');
+
+  const positionManagerFactory = new ethers.ContractFactory(
+    NFPM_ABI,
+    NFPM_BYTECODE,
+    signer);
+  return await positionManagerFactory.deploy(factory.address, weth9Address, nftDescriptor.address);
+};