add failing test for setUsingAsCollateral

test/collateral-swap.spec.ts

@@ -7,6 +7,7 @@ import {APPROVAL_AMOUNT_LENDING_POOL} from '../helpers/constants';
 import {getContractsData, getTxCostAndTimestamp} from './helpers/actions';
 import {calcExpectedATokenBalance} from './helpers/utils/calculations';
 import {waitForTx} from './__setup.spec';
+import {advanceBlock, timeLatest} from '../helpers/misc-utils';
 
 const {expect} = require('chai');
 
@@ -133,4 +134,46 @@ makeSuite('LendingPool CollateralSwap function', (testEnv: TestEnv) => {
       pool.collateralSwap(_mockSwapAdapter.address, weth.address, dai.address, amountToSwap, '0x10')
     ).to.be.revertedWith(HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD);
   });
+
+  it('Should set usage as collateral to false if no leftovers after swap', async () => {
+    const {pool, weth, dai, aEth} = testEnv;
+    const userAddress = await pool.signer.getAddress();
+
+    // cleanup borrowings, to be abe to swap whole weth
+    const amountToRepay = ethers.utils.parseEther('0.2');
+    await weth.mint(amountToRepay);
+    await pool.repay(weth.address, amountToRepay, '1', userAddress);
+    const txTimestamp = (await timeLatest()).plus(100);
+
+    const {
+      reserveData: wethReserveDataBefore,
+      userData: wethUserDataBefore,
+    } = await getContractsData(weth.address, userAddress, testEnv);
+    const amountToSwap = calcExpectedATokenBalance(
+      wethReserveDataBefore,
+      wethUserDataBefore,
+      txTimestamp
+    );
+
+    await advanceBlock(txTimestamp.toNumber());
+
+    console.log('before', amountToSwap.toString());
+    await pool.collateralSwap(
+      _mockSwapAdapter.address,
+      weth.address,
+      dai.address,
+      '1'.toString(),
+      '0x10'
+    );
+    console.log('after', (await aEth.balanceOf(userAddress)).toString());
+    const {userData: wethUserDataAfter} = await getContractsData(
+      weth.address,
+      userAddress,
+      testEnv
+    );
+    expect(wethUserDataAfter.usageAsCollateralEnabled).to.be.equal(
+      false,
+      'usageAsCollateralEnabled are not set to false'
+    );
+  });
 });