From 88adaee99694ee3baa10a97446c07e770f764bd7 Mon Sep 17 00:00:00 2001
From: Phil Bain <bain.pmcg@gmail.com>
Date: Fri, 16 Apr 2021 15:42:56 -0600
Subject: [PATCH] add exit dai function and test

---
 packages/dai-plugin-liquidations/package.json |  2 +-
 .../src/LiquidationService.js                 | 14 +++++++---
 .../test/LiquidationService.test.js           | 27 +++++++++++++++++--
 3 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/packages/dai-plugin-liquidations/package.json b/packages/dai-plugin-liquidations/package.json
index 860a0ede7..d381d554f 100644
--- a/packages/dai-plugin-liquidations/package.json
+++ b/packages/dai-plugin-liquidations/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@makerdao/dai-plugin-liquidations",
   "description": "Plugin to add liquidations to dai.js",
-  "version": "0.1.0-beta10",
+  "version": "0.1.0-beta11",
   "license": "MIT",
   "main": "dist/index.js",
   "unpkg": "umd/index.js",
diff --git a/packages/dai-plugin-liquidations/src/LiquidationService.js b/packages/dai-plugin-liquidations/src/LiquidationService.js
index 289202ec6..f05f2d569 100644
--- a/packages/dai-plugin-liquidations/src/LiquidationService.js
+++ b/packages/dai-plugin-liquidations/src/LiquidationService.js
@@ -247,8 +247,7 @@ export default class LiquidationService extends PublicService {
   }
 
   async getHoleAndDirtForIlk(ilk) {
-    const data = await this._dogContract()
-      .ilks(stringToBytes(ilk));
+    const data = await this._dogContract().ilks(stringToBytes(ilk));
     const hole = new BigNumber(data.hole).div(RAD);
     const dirt = new BigNumber(data.dirt).div(RAD);
     const diff = hole.minus(dirt);
@@ -282,12 +281,21 @@ export default class LiquidationService extends PublicService {
   }
 
   @tracksTransactions
-  async joinDaiToAdapter(address, amount, { promise }) {
+  async joinDaiToAdapter(amount, { promise }) {
+    const address = this.get('web3').currentAddress();
     const amt = BigNumber(amount)
       .times(WAD)
       .toFixed();
     return await this._joinDaiAdapter().join(address, amt, { promise });
   }
+  @tracksTransactions
+  async exitDaiFromAdapter(amount, { promise }) {
+    const address = this.get('web3').currentAddress();
+    const amt = BigNumber(amount)
+      .times(WAD)
+      .toFixed();
+    return await this._joinDaiAdapter().exit(address, amt, { promise });
+  }
 
   @tracksTransactions
   async bark(ilk, urn, { promise }) {
diff --git a/packages/dai-plugin-liquidations/test/LiquidationService.test.js b/packages/dai-plugin-liquidations/test/LiquidationService.test.js
index 965889c87..229c5b76c 100644
--- a/packages/dai-plugin-liquidations/test/LiquidationService.test.js
+++ b/packages/dai-plugin-liquidations/test/LiquidationService.test.js
@@ -40,7 +40,7 @@ async function makerInstance(preset) {
 }
 
 beforeAll(async () => {
-  // To run this test on kovan, just switch the network variables below
+  // To run this test on kovan, just switch the network variables below:
   // network = 'kovan';
   network = 'test';
   maker = await makerInstance(network);
@@ -79,7 +79,7 @@ test('can join DAI to the vat', async () => {
     .dai(maker.currentAddress());
 
   const joinAmt = 80;
-  await service.joinDaiToAdapter(maker.currentAddress(), joinAmt);
+  await service.joinDaiToAdapter(joinAmt);
 
   const vatDaiBalAfter = await maker
     .service('smartContract')
@@ -95,6 +95,29 @@ test('can join DAI to the vat', async () => {
   );
 });
 
+test('can exit DAI from the vat', async () => {
+  const vatDaiBalBefore = await maker
+    .service('smartContract')
+    .getContract('MCD_VAT')
+    .dai(maker.currentAddress());
+
+  const exitAmt = 5;
+  await service.exitDaiFromAdapter(exitAmt);
+
+  const vatDaiBalAfter = await maker
+    .service('smartContract')
+    .getContract('MCD_VAT')
+    .dai(maker.currentAddress());
+
+  expect(vatDaiBalAfter).toEqual(
+    vatDaiBalBefore.sub(
+      BigNumber(exitAmt)
+        .times(RAD)
+        .toFixed()
+    )
+  );
+});
+
 xtest('can successfully bid on an auction', async () => {
   // // const id =
   // //   '0x000000000000000000000000000000000000000000000000000000000000000f';