refactor: define typescript type for AccountSet transaction (#1515)

* define typescript type for AccountSet transaction

test/models/offerCancel.ts

@@ -1,53 +0,0 @@
-import { ValidationError } from 'xrpl-local/common/errors'
-import { verifyOfferCancel } from './../../src/models/transactions/offerCancel'
-import { assert } from 'chai'
-
-/**
- * OfferCancel Transaction Verification Testing
- *
- * Providing runtime verification testing for each specific transaction type
- */
-describe('OfferCancel Transaction Verification', function () {
-   let offer
-   
-   beforeEach(() => {
-       offer = {
-            Account: "rnKiczmiQkZFiDES8THYyLA2pQohC5C6EF",
-            Fee: "10",
-            LastLedgerSequence: 65477334,
-            OfferSequence: 60797528,
-            Sequence: 60797535,
-            SigningPubKey: "0361BFD43D1EEA54B77CC152887312949EBF052997FBFFCDAF6F2653164B55B21...",
-            TransactionType: "OfferCancel",
-            TxnSignature: "30450221008C43BDCFC68B4793857CA47DF454C07E5B45D3F80E8E6785CAB9292...",
-            date: "2021-08-06T21:04:11Z"
-        } as any
-   })
-
-    it (`verifies valid OfferCancel`, () => {        
-        assert.doesNotThrow(() => verifyOfferCancel(offer))        
-    })
-
-    it (`verifies valid OfferCancel with flags`, () => {
-        offer.Flags = 2147483648
-        assert.doesNotThrow(() => verifyOfferCancel(offer))
-    })
-
-    it (`throws w/ invalid OfferSequence`, () => {
-        offer.OfferSequence = '99'
-        assert.throws(
-            () => verifyOfferCancel(offer),
-            ValidationError,
-            "OfferCancel: invalid OfferSequence"
-        )
-    })
-
-    it (`throws w/ missing OfferSequence`, () => {
-        delete offer.OfferSequence
-        assert.throws(
-            () => verifyOfferCancel(offer),
-            ValidationError,
-            "OfferCancel: missing field OfferSequence"
-        )
-    })
-})