feat: preview utxo change after transaction

Author: anyxem

packages/sdk/src/mintlayer-connect-sdk.ts

@@ -2482,6 +2482,13 @@ class Client {
     });
   }
 
+  previewUtxoChange(tx: Transaction): { spent: UtxoEntry[], created: UtxoEntry[] } {
+    const spent: UtxoEntry[] = [];
+    const created: UtxoEntry[] = [];
+
+    return { spent, created };
+  }
+
   async getXPub(): Promise<string> {
     this.ensureInitialized();
     console.warn('[Mintlayer SDK] Warning: Sharing xPub exposes all derived addresses. Use with caution.');

packages/sdk/tests/utxo-change.test.ts

@@ -0,0 +1,63 @@
+import { Client } from '../src/mintlayer-connect-sdk';
+import fetchMock from 'jest-fetch-mock';
+
+import { addresses, utxos } from './__mocks__/accounts/account_01'
+
+beforeEach(() => {
+  fetchMock.resetMocks();
+
+  // эмуляция window.mojito
+  (window as any).mojito = {
+    isExtension: true,
+    connect: jest.fn().mockResolvedValue(addresses),
+    restore: jest.fn().mockResolvedValue(addresses),
+    disconnect: jest.fn().mockResolvedValue(undefined),
+    request: jest.fn().mockResolvedValue('signed-transaction'),
+  };
+
+  // API /chain/tip
+  fetchMock.mockIf('https://api-server-lovelace.mintlayer.org/api/v2/chain/tip', async () => {
+    return {
+      body: JSON.stringify({ height: 200000 }),
+    };
+  });
+
+  // API /account
+  fetchMock.mockIf('https://api.mintini.app/account', async () => {
+    return {
+      body: JSON.stringify({
+        utxos: utxos,
+      }),
+    };
+  });
+});
+
+test('preview utxo after transfer', async () => {
+  const client = await Client.create({ network: 'testnet', autoRestore: false });
+
+  await client.connect();
+
+  const transaction = await client.buildTransaction({
+    type: 'Transfer',
+    params: {
+      to: 'tmt1q9mfg7d6ul2nt5yhmm7l7r6wwyqkd822rymr83uc',
+      amount: 10,
+    }
+  });
+
+  const { spent, created } = client.previewUtxoChange(transaction);
+
+  expect(spent.length).toBe(2);
+  expect(spent[0].outpoint.source_id).toBe('af3b5fad20f6f97eb210934e942176f7f7d0f70423590659ee0e0217053a7cab');
+  expect(spent[0].outpoint.index).toBe(1);
+  expect(created.length).toBe(2);
+  expect(created[0].outpoint.source_id).toBe('05d9ec811338b736816f64965f17844cdbf45711f0892534f3f7408344052bcc');
+  expect(created[0].outpoint.index).toBe(0);
+  expect(created[1].utxo.destination).toBe('tmt1q9mfg7d6ul2nt5yhmm7l7r6wwyqkd822rymr83uc');
+  expect(created[1].utxo.value.amount.decimal).toBe('10');
+  expect(created[1].outpoint.source_id).toBe('05d9ec811338b736816f64965f17844cdbf45711f0892534f3f7408344052bcc');
+  expect(created[1].outpoint.index).toBe(1);
+  expect(created[1].utxo.type).toBe('Transfer');
+  expect(created[1].utxo.value.type).toBe('Coin');
+  expect(created[1].utxo.value.amount.atoms).toBe('1701805604300000');
+});