Use eventually instead of sleep

e2e-lanthan/eventually.js

@@ -0,0 +1,25 @@
+const assert = require('assert');
+
+let defaultInterval = 100;
+let defaultTimeout = 2000;
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+ 
+const eventually = async (fn, timeout = defaultTimeout, interval = defaultInterval) => {
+  let start = Date.now();
+  let loop = async() => {
+    try {
+      await fn();
+    } catch (err) {
+      if (Date.now() - start > timeout) {
+        throw err;
+      }
+      await new Promise((resolve) => setTimeout(resolve, interval))
+      await loop();
+    }
+  };
+  await loop();
+};
+module.exports = eventually;