feat: add support for partial Transaction signing

web3.js/test/transaction.test.js

@@ -0,0 +1,40 @@
+// @flow
+import {Account} from '../src/account';
+import {Transaction} from '../src/transaction';
+import {SystemProgram} from '../src/system-program';
+
+test('signPartial', () => {
+  const account1 = new Account();
+  const account2 = new Account();
+  const lastId = account1.publicKey.toBase58(); // Fake lastId
+  const move = SystemProgram.move(account1.publicKey, account2.publicKey, 123);
+
+  const transaction = new Transaction({lastId}).add(move);
+  transaction.sign(account1, account2);
+
+  const partialTransaction = new Transaction({lastId}).add(move);
+  partialTransaction.signPartial(account1, account2.publicKey);
+  expect(partialTransaction.signatures[1].signature).toBeNull();
+  partialTransaction.addSigner(account2);
+
+  expect(partialTransaction).toEqual(transaction);
+});
+
+test('transfer signatures', () => {
+  const account1 = new Account();
+  const account2 = new Account();
+  const lastId = account1.publicKey.toBase58(); // Fake lastId
+  const move1 = SystemProgram.move(account1.publicKey, account2.publicKey, 123);
+  const move2 = SystemProgram.move(account2.publicKey, account1.publicKey, 123);
+
+  const orgTransaction = new Transaction({lastId}).add(move1, move2);
+  orgTransaction.sign(account1, account2);
+
+  const newTransaction = new Transaction({
+    lastId: orgTransaction.lastId,
+    fee: orgTransaction.fee,
+    signatures: orgTransaction.signatures,
+  }).add(move1, move2);
+
+  expect(newTransaction).toEqual(orgTransaction);
+});