discourse/test/javascripts/mixins/singleton-test.js

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import EmberObject from "@ember/object";
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import Singleton from "discourse/mixins/singleton";
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QUnit.module("mixin:singleton");
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QUnit.test("current", assert => {
var DummyModel = EmberObject.extend({});
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DummyModel.reopenClass(Singleton);
var current = DummyModel.current();
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assert.present(current, "current returns the current instance");
assert.equal(
current,
DummyModel.current(),
"calling it again returns the same instance"
);
assert.notEqual(
current,
DummyModel.create({}),
"we can create other instances that are not the same as current"
);
});
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QUnit.test("currentProp reading", assert => {
var DummyModel = EmberObject.extend({});
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DummyModel.reopenClass(Singleton);
var current = DummyModel.current();
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assert.blank(
DummyModel.currentProp("evil"),
"by default attributes are blank"
);
current.set("evil", "trout");
assert.equal(
DummyModel.currentProp("evil"),
"trout",
"after changing the instance, the value is set"
);
});
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QUnit.test("currentProp writing", assert => {
var DummyModel = EmberObject.extend({});
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DummyModel.reopenClass(Singleton);
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assert.blank(
DummyModel.currentProp("adventure"),
"by default attributes are blank"
);
var result = DummyModel.currentProp("adventure", "time");
assert.equal(result, "time", "it returns the new value");
assert.equal(
DummyModel.currentProp("adventure"),
"time",
"after calling currentProp the value is set"
);
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DummyModel.currentProp("count", 0);
assert.equal(DummyModel.currentProp("count"), 0, "we can set the value to 0");
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DummyModel.currentProp("adventure", null);
assert.equal(
DummyModel.currentProp("adventure"),
null,
"we can set the value to null"
);
});
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QUnit.test("createCurrent", assert => {
var Shoe = EmberObject.extend({});
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Shoe.reopenClass(Singleton, {
createCurrent: function() {
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return Shoe.create({ toes: 5 });
}
});
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assert.equal(
Shoe.currentProp("toes"),
5,
"it created the class using `createCurrent`"
);
});
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QUnit.test("createCurrent that returns null", assert => {
var Missing = EmberObject.extend({});
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Missing.reopenClass(Singleton, {
createCurrent: function() {
return null;
}
});
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assert.blank(Missing.current(), "it doesn't return an instance");
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assert.blank(
Missing.currentProp("madeup"),
"it won't raise an error asking for a property. Will just return null."
);
});