tools: makeTestAddress helper

- returns valid bech32 address for tests

packages/orchestration/package.json

@@ -62,6 +62,7 @@
     "@endo/import-bundle": "^1.3.2",
     "@endo/ses-ava": "^1.2.8",
     "ava": "^5.3.1",
+    "bech32": "^2.0.0",
     "c8": "^10.1.2",
     "prettier": "^3.4.2",
     "ts-blank-space": "^0.4.4"

packages/orchestration/test/tools/make-test-address.test.ts

@@ -0,0 +1,22 @@
+import test from '@endo/ses-ava/prepare-endo.js';
+import { encodeAddressHook } from '@agoric/cosmic-proto/address-hooks.js';
+import { makeTestAddress } from '../../tools/make-test-address.js';
+
+test('makeTestAddress returns valid bech32', t => {
+  t.is(makeTestAddress(), 'agoric1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqp7zqht');
+  t.is(makeTestAddress(1), 'agoric1qyqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqc09z0g');
+  t.is(
+    makeTestAddress(0, 'agoric', 32),
+    'agoric1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqkppep3',
+  );
+  t.is(
+    makeTestAddress(0, 'cosmos'),
+    'cosmos1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqnrql8a',
+  );
+});
+
+test('makeTestAddress creates address accepted by encodeAddressHook', t => {
+  const params = { EUD: makeTestAddress(0, 'osmosis') };
+  t.throws(() => encodeAddressHook('agoric1FakeLCAAddress', params));
+  t.notThrows(() => encodeAddressHook(makeTestAddress(), params));
+});

packages/orchestration/tools/make-test-address.js

@@ -0,0 +1,21 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { bech32 } from 'bech32';
+
+/**
+ * @param {number} index
+ * @param {string} prefix
+ * @param {number} byteLength
+ * @returns {string} a mock bech32 address for tests
+ */
+export const makeTestAddress = (
+  index = 0,
+  prefix = 'agoric',
+  byteLength = 20,
+) => {
+  // create a simple 20-byte array (common address length)
+  const bytes = new Uint8Array(byteLength).fill(0);
+  // if index provided, put it in the first byte
+  if (index !== 0) bytes[0] = Number(index);
+  const words = bech32.toWords(bytes);
+  return bech32.encode(prefix, words);
+};