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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="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>

<script src="/node_modules/@webcomponents/webcomponentsjs/webcomponents-lite.js"></script>
<script src="/components/wct-browser-legacy/browser.js"></script>

<dom-element id="some-element">
  <script type="module">
import '../../../test/common-test-setup.js';
import {Polymer} from '@polymer/polymer/lib/legacy/polymer-fn.js';
Polymer({
  is: 'some-element',
  properties: {
    fooBar: {
      type: Object,
      notify: true,
    },
  },
});
</script>

</dom-element>

<test-fixture id="basic">
  <template>
    <some-element></some-element>
  </template>
</test-fixture>

<script type="module">
import {GrAttributeHelper} from './gr-attribute-helper.js';

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>