chore: remove unused functions and move single-use function (#211)

## Description

I wanted to see how many of the helper TS functions/contracts were still
needed.

Notably, I removed `sign.test.ts` because it just tests a specific
feature of the Typescript library and has no relevance to the contract
code.

I also wanted to remove the Chi token, but this required simplifying the
bench and already on current main we see that `yarn bench:trace` doesn't
work anymore (probably because experimental tracing stopped working). I
didn't want to possible aggravate the issue with this PR so I left
everything as it was to be solved at a later point.

I didn't remove `decoding.test.ts` so that in the future we double check
that our Solidity test libraries have the same tests.

## Test Plan

CI.

## Related Issues

Closes #128.

Author: fedgiac

test/balancer.ts

@@ -4,8 +4,3 @@ export enum UserBalanceOpKind {
   TRANSFER_INTERNAL = 2,
   TRANSFER_EXTERNAL = 3,
 }
-
-export enum BalancerErrors {
-  SWAP_LIMIT = "BAL#507",
-  SWAP_DEADLINE = "BAL#508",
-}

test/bytecode.ts

@@ -1,5 +1,5 @@
 import { expect } from "chai";
-import { constants, utils, Wallet } from "ethers";
+import { constants, ethers, utils, Wallet } from "ethers";
 import { waffle } from "hardhat";
 
 import {
@@ -20,8 +20,6 @@ import {
   signOrder,
 } from "../src/ts";
 
-import { fillDistinctBytes, SAMPLE_ORDER } from "./testHelpers";
-
 type UnknownArray = unknown[] | readonly unknown[];
 // [A, B, C] -> [A, B]
 type RemoveLast<T extends UnknownArray> = T extends [...infer U, unknown]
@@ -107,6 +105,29 @@ function validFlags(): TradeFlags[] {
   /* eslint-enable @typescript-eslint/no-explicit-any */
 }
 
+function fillDistinctBytes(count: number, start: number): string {
+  return ethers.utils.hexlify(
+    [...Array(count)].map((_, i) => (start + i) % 256),
+  );
+}
+
+function fillBytes(count: number, byte: number): string {
+  return ethers.utils.hexlify([...Array(count)].map(() => byte));
+}
+
+const SAMPLE_ORDER = {
+  sellToken: fillBytes(20, 0x01),
+  buyToken: fillBytes(20, 0x02),
+  receiver: fillBytes(20, 0x03),
+  sellAmount: ethers.utils.parseEther("42"),
+  buyAmount: ethers.utils.parseEther("13.37"),
+  validTo: 0xffffffff,
+  appData: ethers.constants.HashZero,
+  feeAmount: ethers.utils.parseEther("1.0"),
+  kind: OrderKind.SELL,
+  partiallyFillable: false,
+};
+
 describe("Order flags", () => {
   it("encodeTradeFlags is the right inverse of decodeTradeFlags", () => {
     for (const tradeFlags of validFlags()) {

test/decoding.test.ts

@@ -14,10 +14,15 @@ import {
   domain,
   grantRequiredRoles,
 } from "../../src/ts";
-import { UserBalanceOpKind, BalancerErrors } from "../balancer";
+import { UserBalanceOpKind } from "../balancer";
 
 import { deployTestContracts } from "./fixture";
 
+enum BalancerErrors {
+  SWAP_LIMIT = "BAL#507",
+  SWAP_DEADLINE = "BAL#508",
+}
+
 const LOTS = ethers.utils.parseEther("10000.0");
 const debug = Debug("e2e:balancerSwap");
 

test/e2e/balancerSwap.test.ts

@@ -10,7 +10,6 @@ import {
   implementationAddress,
   proxyInterface,
 } from "../../src/ts";
-import { builtAndDeployedMetadataCoincide } from "../bytecode";
 
 import { deployTestContracts } from "./fixture";
 
@@ -22,6 +21,26 @@ async function contractAddress<C extends ContractName>(
   return deterministicDeploymentAddress(artifact, deploymentArguments);
 }
 
+async function builtAndDeployedMetadataCoincide(
+  contractAddress: string,
+  contractName: string,
+): Promise<boolean> {
+  const contractArtifacts = await artifacts.readArtifact(contractName);
+
+  const code = await ethers.provider.send("eth_getCode", [
+    contractAddress,
+    "latest",
+  ]);
+
+  // NOTE: The last 53 bytes in a deployed contract's bytecode contains the
+  // contract metadata. Compare the deployed contract's metadata with the
+  // compiled contract's metadata.
+  // <https://docs.soliditylang.org/en/v0.7.6/metadata.html>
+  const metadata = (bytecode: string) => bytecode.slice(-106);
+
+  return metadata(code) === metadata(contractArtifacts.deployedBytecode);
+}
+
 describe("E2E: Deployment", () => {
   let owner: Wallet;
   let manager: Wallet;

test/e2e/deployment.test.ts

@@ -1,6 +1,6 @@
 import ERC20 from "@openzeppelin/contracts/build/contracts/ERC20PresetMinterPauser.json";
 import { expect } from "chai";
-import { BigNumber, Contract, Wallet } from "ethers";
+import { BigNumber, BigNumberish, Contract, Wallet } from "ethers";
 import { ethers, waffle } from "hardhat";
 
 import {
@@ -11,10 +11,13 @@ import {
   TypedDataDomain,
   domain,
 } from "../../src/ts";
-import { ceilDiv } from "../testHelpers";
 
 import { deployTestContracts } from "./fixture";
 
+function ceilDiv(p: BigNumberish, q: BigNumberish): BigNumber {
+  return BigNumber.from(p).add(q).sub(1).div(q);
+}
+
 describe("E2E: RetrETH Red Wine and Olive Oil Market", () => {
   let deployer: Wallet;
   let solver: Wallet;

test/e2e/wineOilMarket.test.ts

@@ -1,17 +1,9 @@
 import { BigNumber } from "ethers";
 import { ethers } from "hardhat";
 
-import {
-  Order,
-  OrderBalance,
-  OrderKind,
-  normalizeOrder,
-  FLAG_MASKS,
-  FlagKey,
-  FlagOptions,
-} from "../src/ts";
+import { Order, OrderBalance, OrderKind } from "../src/ts";
 
-export type AbiOrder = [
+type AbiOrder = [
   string,
   string,
   string,
@@ -26,42 +18,6 @@ export type AbiOrder = [
   string,
 ];
 
-function optionsForKey<K extends FlagKey>(key: K): FlagOptions<K> {
-  return FLAG_MASKS[key].options;
-}
-export const allOrderKinds = optionsForKey("kind");
-export const allPartiallyFillable = optionsForKey("partiallyFillable");
-export const allSigningSchemes = optionsForKey("signingScheme");
-
-export function allOptions<
-  K extends FlagKey,
-  AllOptions extends Record<K, FlagOptions<K>>,
->(): AllOptions {
-  const result: Record<string, FlagOptions<K>> = {};
-  Object.entries(FLAG_MASKS).map(
-    ([key, value]) => (result[key] = value.options),
-  );
-  return result as AllOptions;
-}
-
-export function encodeOrder(order: Order): AbiOrder {
-  const o = normalizeOrder(order);
-  return [
-    o.sellToken,
-    o.buyToken,
-    o.receiver,
-    BigNumber.from(o.sellAmount),
-    BigNumber.from(o.buyAmount),
-    o.validTo,
-    o.appData,
-    BigNumber.from(o.feeAmount),
-    ethers.utils.id(o.kind),
-    o.partiallyFillable,
-    ethers.utils.id(o.sellTokenBalance),
-    ethers.utils.id(o.buyTokenBalance),
-  ];
-}
-
 function decodeEnum<T>(hash: string, values: T[]): T {
   for (const value of values) {
     if (hash == ethers.utils.id(`${value}`)) {