fx-framework/fx-shared-instance-test.html at master · esprehn/fx-framework · GitHub

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<!--
    Copyright 2014 The Chromium Authors. All rights reserved.
    Use of this source code is governed by a BSD-style license that can be
    found in the LICENSE file.
 -->
<link rel="import" href="fx-shared-instance.html">

<polymer-element name="fx-shared-instance-test" extends="fx-shared-instance" noscript></polymer>

<script>
"use strict";

describe("fx-shared-instance", function() {
    var container;
    var events;

    beforeEach(function() {
        container = document.body.appendChild(document.createElement("div"));
        events = [];
    });

    afterEach(function() {
        container.remove();
        container = null;
        events = null;
    });

    function defaultCallback(data) {
        events.push({
            instance: this,
            data: data
        });
    }

    function createInstance(type, method, callback) {
        var observer = document.createElement("fx-shared-instance-test");
        if (type)
            observer.instanceType = type;
        if (method && callback)
            observer[method] = callback;
        else if (method)
            observer[method] = defaultCallback;
        return observer;
    }

    it("should notify all instances", function() {
        var a = container.appendChild(createInstance("", "example"));
        var b = container.appendChild(createInstance("", "example"));
        a.notifyInstances("example", {value: 100});

        assert.equal(events.length, 2);
        assert.equal(events[0].instance, a);
        assert.equal(events[0].data.value, 100);
        assert.equal(events[1].instance, b);
        assert.equal(events[1].data.value, 100);
    });

    it("should not fail when message type is not a function", function() {
        var a = container.appendChild(createInstance(""));
        a.notifyInstances("not a function");
        a.notifyInstances("__proto__");
        assert.equal(events.length, 0);
    });

    it("should only notify attached instances", function() {
        var a = container.appendChild(createInstance("", "example"));
        var b = container.appendChild(createInstance("", "example"));

        a.remove();
        a.notifyInstances("example");

        assert.equal(events.length, 1);
        assert.equal(events[0].instance, b);

        events = [];
        b.remove();
        b.notifyInstances("example");
        assert.equal(events.length, 0);

        container.appendChild(b);
        container.appendChild(a);

        events = [];
        b.notifyInstances("example");
        assert.equal(events.length, 2);
        assert.equal(events[0].instance, b);
        assert.equal(events[1].instance, a);
    });

    it("should notify all instances async", function() {
        var a = container.appendChild(createInstance("", "example"));
        var b = container.appendChild(createInstance("", "example"));
        return a.notifyInstancesAsync("example", {value: 100}).then(function(value) {
            assert.equal(value, undefined);
            assert.equal(events.length, 2);
            assert.equal(events[0].instance, a);
            assert.equal(events[0].data.value, 100);
            assert.equal(events[1].instance, b);
            assert.equal(events[1].data.value, 100);
        });
    });

    it("should allow static notification", function() {
        FxSharedInstance.notify("fx-shared-instance-test", {value: 1});

        var a = container.appendChild(createInstance("", "example"));

        FxSharedInstance.notify("fx-shared-instance-test", "example", {value: 2});
        FxSharedInstance.notify("not-an-element", "example", {value: 2});

        assert.equal(events.length, 1);
        assert.equal(events[0].instance, a);
        assert.equal(events[0].data.value, 2);

        return FxSharedInstance.notifyAsync("fx-shared-instance-test", "example", {value:3}).then(function() {
            assert.equal(events.length, 2);
            assert.equal(events[1].instance, a);
            assert.equal(events[1].data.value, 3);
        });
    });

    it("should allow getting all instances", function() {
        var a = container.appendChild(createInstance());
        var b = container.appendChild(createInstance());

        assert.equal(a.getInstances().length, 2);
        assert.deepEqual(a.getInstances(), [a, b]);
        var instances = FxSharedInstance.getInstances("fx-shared-instance-test");
        assert.equal(instances.length, 2);
        assert.deepEqual(instances, [a, b]);

        a.remove();

        assert.equal(a.getInstances().length, 1);
        assert.deepEqual(a.getInstances(), [b]);
        var instances = FxSharedInstance.getInstances("fx-shared-instance-test");
        assert.equal(instances.length, 1);
        assert.deepEqual(instances, [b]);

        b.remove();

        assert.equal(b.getInstances().length, 0);
        var instances = FxSharedInstance.getInstances("fx-shared-instance-test");
        assert.equal(instances.length, 0);
    });

    it("should allow setting an explicit instance type", function() {
        var a = container.appendChild(createInstance("ex-test"));

        assert.equal(a.getInstances().length, 1);
        assert.deepEqual(a.getInstances(), [a]);
        var instances = FxSharedInstance.getInstances("ex-test");
        assert.equal(instances.length, 1);
        assert.deepEqual(instances, [a]);
    });
});
</script>