Vendor dependencies

Let's see how I like this workflow.

vendor/js-sys/tests/wasm/ArrayIterator.rs

@@ -0,0 +1,39 @@
+use js_sys::*;
+use wasm_bindgen::JsValue;
+use wasm_bindgen_test::*;
+
+#[wasm_bindgen_test]
+fn keys() {
+    let array = Array::new();
+    array.push(&JsValue::from(1));
+    array.push(&JsValue::from(2));
+    array.push(&JsValue::from(3));
+    array.push(&JsValue::from(4));
+    array.push(&JsValue::from(5));
+
+    let new_array = Array::from(&array.keys().into());
+
+    let mut result = Vec::new();
+    new_array.for_each(&mut |i, _, _| result.push(i.as_f64().unwrap()));
+    assert_eq!(result, [0.0, 1.0, 2.0, 3.0, 4.0]);
+}
+
+#[wasm_bindgen_test]
+fn entries() {
+    let array = Array::new();
+    array.push(&JsValue::from(1));
+    array.push(&JsValue::from(2));
+    array.push(&JsValue::from(3));
+    array.push(&JsValue::from(4));
+    array.push(&JsValue::from(5));
+
+    let new_array = Array::from(&array.entries().into());
+
+    new_array.for_each(&mut |a, i, _| {
+        assert!(a.is_object());
+        let array: Array = a.into();
+        assert_eq!(array.shift().as_f64().unwrap(), i as f64);
+        assert_eq!(array.shift().as_f64().unwrap(), (i + 1) as f64);
+        assert_eq!(array.length(), 0);
+    });
+}