From fc10c250c95a698163b765e9b91ab647da89e7aa Mon Sep 17 00:00:00 2001
From: nsreed <norman@normanreed.com>
Date: Wed, 2 Jun 2021 19:23:47 -0400
Subject: [PATCH] add load-browser-scripts utility (#1077)

---
 test/panic/util/load-browser-scripts.js | 41 +++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 test/panic/util/load-browser-scripts.js

diff --git a/test/panic/util/load-browser-scripts.js b/test/panic/util/load-browser-scripts.js
new file mode 100644
index 00000000..d40f77e4
--- /dev/null
+++ b/test/panic/util/load-browser-scripts.js
@@ -0,0 +1,41 @@
+module.exports = {
+  /**
+   * Loads scripts in PANIC clients
+   * @param browsers a Panic.ClientList of browsers
+   * @param paths an array of paths to desired .js files
+   * @returns Promise which will resolve when all browsers have loaded all dependencies
+   */
+  loadBrowserScripts: function (browsers, paths) {
+    var promises = [];
+    browsers.each(function (client, id) {
+      promises.push(client.run(function (test) {
+        test.async();
+        var env = test.props;
+        var imports = env.paths || [];
+        /** Loads a single script in the browser */
+        function load(src, cb) {
+          var script = document.createElement('script');
+          script.onload = cb; script.src = src;
+          document.head.appendChild(script);
+        }
+        /** Loads scripts in order, waiting on each to load before proceeding */
+        function loadAll(src, cb) {
+          if (src.length === 0) {
+            cb();
+            return;
+          }
+          var cur = src.shift();
+          // console.log('loading library:', cur);
+          load(cur, function () {
+            loadAll(src, cb);
+          });
+        }
+
+        loadAll(imports, function () {
+          test.done();
+        });
+      }, {paths: paths}));
+    });
+    return Promise.all(promises);
+  }
+};
\ No newline at end of file