Add dropbox support

loadQueue.test.js

@@ -0,0 +1,20 @@
+import LoadQueue from "./loadQueue";
+
+describe("LoadQueue", () => {
+  it("executes some promises", () => {
+    const results = [];
+    const makePushPromise = n => {
+      return new Promise(resolve => {
+        results.push(n);
+        resolve();
+      });
+    };
+
+    const task1 = makePushPromise(1);
+    const task2 = makePushPromise(2);
+    const task3 = makePushPromise(3);
+    const task4 = makePushPromise(4);
+
+    const loadQueue = new LoadQueue({ threads: 4 });
+  });
+});