1 files changed, 44 insertions, 0 deletions
diff --git a/tests/test_util.js b/tests/test_util.js
new file mode 100644
index 00000000..7780b0ad
--- /dev/null
+++ b/tests/test_util.js
@@ -0,0 +1,44 @@
+function new_deffer() {
+    var deffer = {
+        cb: null,
+        call_cb: false,
+    };
+    deffer.done = function(cb) {
+        deffer.cb = cb;
+        if (deffer.call_cb) {
+            // warning: going down callstack - should probably use setInterval
+            deffer.call_cb = false; // first do this to avoid endless recursion
+            return deffer.cb();
+        }
+    };
+    deffer.on_done = function() {
+        if (this.cb) {
+            this.call_cb = false;
+            this.cb();
+        } else {
+            this.call_cb = true;
+        }
+    };
+    return deffer;
+}
+
+function addScript(window, name) {
+    var scriptEl = window.document.createElement("script");
+    scriptEl.src = name;
+    var deffer = new_deffer();
+    deffer.load_next = function(script) {
+        var sec_deffer = new_deffer();
+        addScript(window, script).done(
+            function() { sec_deffer.on_done(); })
+        return sec_deffer;
+    }
+    function onload_cb() {
+        console.log('addScript: loaded ' + name);
+        deffer.on_done();
+    }
+    scriptEl.onload = onload_cb;
+    window.document.body.appendChild(scriptEl);
+    return deffer;
+}
+
+exports.addScript = addScript;