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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>