test: added integraiton test of drain_delegate

re #2068

integration-tests/contract-drain-delegate-operation.spec.ts

@@ -0,0 +1,44 @@
+import { TezosToolkit } from "@taquito/taquito";
+import { CONFIGS } from "./config";
+
+CONFIGS().forEach(({ lib, rpc, setup, createAddress }) => {
+  const Tezos = lib;
+  const flextesanet = (rpc === 'http://0.0.0.0:20000') ? it : it.skip
+
+  describe(`Test drain delegate with defaul consensus key through contract api using: ${rpc}`, () => {
+    let delegate: TezosToolkit
+    let delegatePkh: string
+    let destinationPkh: string
+    beforeAll(async (done) => {
+      await setup(true)
+
+      try {
+        delegate = await createAddress()
+        delegatePkh = await delegate.signer.publicKeyHash()
+        const fund = await Tezos.contract.transfer({ amount: 5, to: delegatePkh})
+        await fund.confirmation();
+        const register = await delegate.contract.registerDelegate({})
+        await register.confirmation()
+
+        const destination = await createAddress()
+        destinationPkh = await destination.signer.publicKeyHash()
+        const consensus = await delegate.contract.updateConsensusKey({pk: await destination.signer.publicKey()})
+        await consensus.confirmation()
+      } catch(e) {
+        console.log(JSON.stringify(e))
+      }
+      done();
+    })
+    flextesanet('Verify that new Account can be created, registered as delegate and drained itself', async (done) => {
+
+      expect((await delegate.rpc.getBalance(delegatePkh)).toNumber()).toBeGreaterThan(0)
+      await delegate.contract.drainDelegate({
+        consensus_key: destinationPkh,
+        delegate: delegatePkh,
+        destination: destinationPkh,
+      })
+      expect((await delegate.tz.getBalance(delegatePkh)).toNumber).toEqual(0)
+      done();
+    });
+  });
+})