test: add utility to wait for values

test/indexer-test.js

@@ -17,6 +17,7 @@ const FullNode = require('../lib/node/fullnode');
 const Network = require('../lib/protocol/network');
 const network = Network.get('regtest');
 const {NodeClient, WalletClient} = require('bclient');
+const {forValue} = require('./util/common');
 
 const workers = new WorkerPool({
   enabled: true
@@ -298,6 +299,8 @@ describe('Indexer', function() {
         assert.equal(blocks.length, 1);
       }
 
+      await forValue(node.chain, 'height', 160);
+
       // Send unconfirmed to the vector addresses.
       for (let i = 0; i < 3; i++) {
         for (const v of vectors) {
@@ -307,6 +310,8 @@ describe('Indexer', function() {
           unconfirmed.push(txid);
         }
       }
+
+      await forValue(node.mempool.map, 'size', 6);
     });
 
     after(async () => {

test/util/common.js

@@ -102,6 +102,27 @@ common.rimraf = async function(p) {
   return await fs.rimraf(p);
 };
 
+common.forValue = async function(obj, key, val, timeout = 60000) {
+  assert(typeof obj === 'object');
+  assert(typeof key === 'string');
+
+  const ms = 10;
+  let interval = null;
+  let count = 0;
+  return new Promise((resolve, reject) => {
+    interval = setInterval(() => {
+      if (obj[key] === val) {
+        clearInterval(interval);
+        resolve();
+      } else if (count * ms >= timeout) {
+        clearInterval(interval);
+        reject(new Error('Timeout waiting for value.'));
+      }
+      count += 1;
+    }, ms);
+  });
+};
+
 function parseUndo(data) {
   const br = bio.read(data);
   const items = [];