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<!DOCTYPE html>
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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-attribute-helper</title>
<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<script src="../../../bower_components/web-component-tester/browser.js"></script>
<link rel="import" href="../../../test/common-test-setup.html"/>
<link rel="import" href="gr-attribute-helper.html"/>
<script>void(0);</script>
<dom-element id="some-element">
<script>
Polymer({
is: 'some-element',
_legacyUndefinedCheck: true,
properties: {
fooBar: {
type: Object,
notify: true,
},
},
});
</script>
</dom-element>
<test-fixture id="basic">
<template>
<some-element></some-element>
</template>
</test-fixture>
<script>
suite('gr-attribute-helper tests', () => {
let element;
let instance;
let sandbox;
setup(() => {
sandbox = sinon.sandbox.create();
element = fixture('basic');
instance = new GrAttributeHelper(element);
});
teardown(() => {
sandbox.restore();
});
test('resolved on value change from undefined', () => {
const promise = instance.get('fooBar').then(value => {
assert.equal(value, 'foo! bar!');
});
element.fooBar = 'foo! bar!';
return promise;
});
test('resolves to current attribute value', () => {
element.fooBar = 'foo-foo-bar';
const promise = instance.get('fooBar').then(value => {
assert.equal(value, 'foo-foo-bar');
});
element.fooBar = 'no bar';
return promise;
});
test('bind', () => {
const stub = sandbox.stub();
element.fooBar = 'bar foo';
const unbind = instance.bind('fooBar', stub);
element.fooBar = 'partridge in a foo tree';
element.fooBar = 'five gold bars';
assert.equal(stub.callCount, 3);
assert.deepEqual(stub.args[0], ['bar foo']);
assert.deepEqual(stub.args[1], ['partridge in a foo tree']);
assert.deepEqual(stub.args[2], ['five gold bars']);
stub.reset();
unbind();
instance.fooBar = 'ladies dancing';
assert.isFalse(stub.called);
});
});
</script>