Add test verifying that issues #209 and #210 were with the playground, not library

Author: rkalis

packages/cashscript/test/Contract.test.ts

@@ -3,7 +3,9 @@ import { placeholder } from '@cashscript/utils';
 import {
   Contract,
   ElectrumNetworkProvider,
+  MockNetworkProvider,
   Network,
+  randomUtxo,
   SignatureTemplate,
 } from '../src/index.js';
 import {
@@ -110,6 +112,21 @@ describe('Contract', () => {
     });
   });
 
+  describe('getUtxos', () => {
+    it('should return utxos for existing contract on mocknet', async () => {
+      const provider = new MockNetworkProvider();
+      const instance = new Contract(p2pkhArtifact, [alicePkh], { provider });
+
+      provider.addUtxo(instance.address, randomUtxo());
+
+      const utxos = await instance.getUtxos();
+      const utxosFromProvider = await provider.getUtxos(instance.address);
+
+      expect(utxos).toHaveLength(1);
+      expect(utxos).toEqual(utxosFromProvider);
+    });
+  });
+
   describe('Contract functions', () => {
     let instance: Contract;
     let bbInstance: Contract;