fix tests

contracts/interfaces/IUniswapV2Factory.sol

@@ -8,7 +8,7 @@ interface IUniswapV2Factory {
     function sortTokens(address tokenA, address tokenB) external pure returns (address, address);
     function getExchange(address tokenA, address tokenB) external view returns (address);
     function getTokens(address exchange) external view returns (address, address);
-    function getExchanges() external view returns (address[] memory);
+    function getExchanges(uint) external view returns (address);
     function getExchangesCount() external view returns (uint);
 
     function createExchange(address tokenA, address tokenB) external returns (address exchange);

package.json

@@ -6,15 +6,16 @@
     "solc": "0.5.13"
   },
   "devDependencies": {
-    "@types/chai": "^4.2.3",
+    "@types/chai": "^4.2.6",
     "@types/mocha": "^5.2.7",
     "chai": "^4.2.0",
-    "ethereum-waffle": "^2.1.1",
-    "ethereumjs-util": "^6.1.0",
+    "ethereum-waffle": "2.1.0",
+    "ethereumjs-util": "^6.2.0",
+    "ethers": "^4.0.40",
     "mocha": "^6.2.2",
-    "prettier": "^1.18.2",
-    "ts-node": "^8.4.1",
-    "typescript": "^3.6.4"
+    "prettier": "^1.19.1",
+    "ts-node": "^8.5.4",
+    "typescript": "^3.7.3"
   },
   "scripts": {
     "prettier:check": "yarn prettier ./test/*.ts --check",

test/UniswapV2Factory.spec.ts

@@ -32,7 +32,7 @@ describe('UniswapV2Factory', () => {
 
   it('exchangeBytecode', async () => {
     expect(await factory.exchangeBytecode()).to.eq(bytecode)
-    expect(await factory.getExchangesLength()).to.eq(0)
+    expect(await factory.getExchangesCount()).to.eq(0)
   })
 
   async function createExchange(tokens: string[]) {
@@ -46,14 +46,11 @@ describe('UniswapV2Factory', () => {
       'UniswapV2Factory: EXCHANGE_EXISTS'
     )
 
-    expect(await factory.getExchangesLength()).to.eq(1)
-    expect(await factory.getTokens(create2Address)).to.deep.eq([TEST_ADDRESSES.token0, TEST_ADDRESSES.token1])
     expect(await factory.getExchange(...tokens)).to.eq(create2Address)
     expect(await factory.getExchange(...tokens.slice().reverse())).to.eq(create2Address)
-    expect(await factory.getOtherTokens(tokens[0])).to.deep.eq([tokens[1]])
-    expect(await factory.getOtherTokens(tokens[1])).to.deep.eq([tokens[0]])
-    expect(await factory.getOtherTokensLength(tokens[0])).to.deep.eq(bigNumberify(1))
-    expect(await factory.getOtherTokensLength(tokens[1])).to.deep.eq(bigNumberify(1))
+    expect(await factory.getTokens(create2Address)).to.deep.eq([TEST_ADDRESSES.token0, TEST_ADDRESSES.token1])
+    expect(await factory.getExchanges(0)).to.eq(create2Address)
+    expect(await factory.getExchangesCount()).to.eq(1)
 
     const exchange = new Contract(create2Address, JSON.stringify(UniswapV2.abi), provider)
     expect(await exchange.factory()).to.eq(factory.address)