a17d54d0bf
Using arrow functions changes `this` context, which is undesired in tests, e.g. it makes it impossible to setup things like pretender (`this.server`) in `beforeEach` hooks. Ember guides always use classic functions in examples (e.g. https://guides.emberjs.com/release/testing/test-types/), and that's what it uses in its own test suite, as do various addons and ember apps. It was also already used in Discourse where `this` was required. Moving forward, it will be needed in more places as we migrate toward ember-cli. (I might later add a custom rule to eslint-discourse-ember to enforce this)
98 lines
2.5 KiB
JavaScript
98 lines
2.5 KiB
JavaScript
import { test, module } from "qunit";
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import EmberObject from "@ember/object";
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import Singleton from "discourse/mixins/singleton";
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module("mixin:singleton");
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test("current", function (assert) {
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var DummyModel = EmberObject.extend({});
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DummyModel.reopenClass(Singleton);
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var current = DummyModel.current();
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assert.present(current, "current returns the current instance");
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assert.equal(
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current,
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DummyModel.current(),
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"calling it again returns the same instance"
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);
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assert.notEqual(
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current,
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DummyModel.create({}),
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"we can create other instances that are not the same as current"
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);
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});
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test("currentProp reading", function (assert) {
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var DummyModel = EmberObject.extend({});
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DummyModel.reopenClass(Singleton);
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var current = DummyModel.current();
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assert.blank(
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DummyModel.currentProp("evil"),
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"by default attributes are blank"
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);
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current.set("evil", "trout");
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assert.equal(
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DummyModel.currentProp("evil"),
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"trout",
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"after changing the instance, the value is set"
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);
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});
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test("currentProp writing", function (assert) {
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var DummyModel = EmberObject.extend({});
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DummyModel.reopenClass(Singleton);
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assert.blank(
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DummyModel.currentProp("adventure"),
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"by default attributes are blank"
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);
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var result = DummyModel.currentProp("adventure", "time");
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assert.equal(result, "time", "it returns the new value");
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assert.equal(
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DummyModel.currentProp("adventure"),
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"time",
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"after calling currentProp the value is set"
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);
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DummyModel.currentProp("count", 0);
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assert.equal(DummyModel.currentProp("count"), 0, "we can set the value to 0");
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DummyModel.currentProp("adventure", null);
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assert.equal(
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DummyModel.currentProp("adventure"),
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null,
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"we can set the value to null"
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);
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});
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test("createCurrent", function (assert) {
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var Shoe = EmberObject.extend({});
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Shoe.reopenClass(Singleton, {
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createCurrent: function () {
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return Shoe.create({ toes: 5 });
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},
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});
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assert.equal(
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Shoe.currentProp("toes"),
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5,
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"it created the class using `createCurrent`"
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);
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});
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test("createCurrent that returns null", function (assert) {
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var Missing = EmberObject.extend({});
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Missing.reopenClass(Singleton, {
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createCurrent: function () {
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return null;
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},
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});
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assert.blank(Missing.current(), "it doesn't return an instance");
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assert.blank(
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Missing.currentProp("madeup"),
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"it won't raise an error asking for a property. Will just return null."
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);
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});
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