import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

devtools/client/shared/redux/middleware/test/test_middleware-task-01.js

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { createStore, applyMiddleware } = require("devtools/client/shared/vendor/redux");
+const { task } = require("devtools/client/shared/redux/middleware/task");
+
+/**
+ * Tests that task middleware allows dispatching generators, promises and objects
+ * that return actions;
+ */
+
+function run_test() {
+  run_next_test();
+}
+
+add_task(function* () {
+  let store = applyMiddleware(task)(createStore)(reducer);
+
+  store.dispatch(fetch1("generator"));
+  yield waitUntilState(store, () => store.getState().length === 1);
+  equal(store.getState()[0].data, "generator",
+        "task middleware async dispatches an action via generator");
+
+  store.dispatch(fetch2("sync"));
+  yield waitUntilState(store, () => store.getState().length === 2);
+  equal(store.getState()[1].data, "sync",
+        "task middleware sync dispatches an action via sync");
+});
+
+function fetch1(data) {
+  return function* (dispatch, getState) {
+    equal(getState().length, 0, "`getState` is accessible in a generator action");
+    let moreData = yield new Promise(resolve => resolve(data));
+    // Ensure it handles more than one yield
+    moreData = yield new Promise(resolve => resolve(data));
+    dispatch({ type: "fetch1", data: moreData });
+  };
+}
+
+function fetch2(data) {
+  return {
+    type: "fetch2",
+    data
+  };
+}
+
+function reducer(state = [], action) {
+  do_print("Action called: " + action.type);
+  if (["fetch1", "fetch2"].includes(action.type)) {
+    state.push(action);
+  }
+  return [...state];
+}