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Copyright (C) 2016 The Android Open Source Project

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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-lib-loader</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>

<test-fixture id="basic">
  <template>
    <gr-lib-loader></gr-lib-loader>
  </template>
</test-fixture>

<script type="module">
import '../../../test/common-test-setup.js';
import './gr-lib-loader.js';
suite('gr-lib-loader tests', () => {
  let sandbox;
  let element;
  let resolveLoad;
  let loadStub;

  setup(() => {
    sandbox = sinon.sandbox.create();
    element = fixture('basic');

    loadStub = sandbox.stub(element, '_loadScript', () =>
      new Promise(resolve => resolveLoad = resolve)
    );

    // Assert preconditions:
    assert.isFalse(element._hljsState.loading);
  });

  teardown(() => {
    if (window.hljs) {
      delete window.hljs;
    }
    sandbox.restore();

    // Because the element state is a singleton, clean it up.
    element._hljsState.configured = false;
    element._hljsState.loading = false;
    element._hljsState.callbacks = [];
  });

  test('only load once', done => {
    sandbox.stub(element, '_getHLJSUrl').returns('');
    const firstCallHandler = sinon.stub();
    element.getHLJS().then(firstCallHandler);

    // It should now be in the loading state.
    assert.isTrue(loadStub.called);
    assert.isTrue(element._hljsState.loading);
    assert.isFalse(firstCallHandler.called);

    const secondCallHandler = sinon.stub();
    element.getHLJS().then(secondCallHandler);

    // No change in state.
    assert.isTrue(element._hljsState.loading);
    assert.isFalse(firstCallHandler.called);
    assert.isFalse(secondCallHandler.called);

    // Now load the library.
    resolveLoad();
    flush(() => {
      // The state should be loaded and both handlers called.
      assert.isFalse(element._hljsState.loading);
      assert.isTrue(firstCallHandler.called);
      assert.isTrue(secondCallHandler.called);
      done();
    });
  });

  suite('preloaded', () => {
    let hljsStub;

    setup(() => {
      hljsStub = {
        configure: sinon.stub(),
      };
      window.hljs = hljsStub;
    });

    teardown(() => {
      delete window.hljs;
    });

    test('returns hljs', done => {
      const firstCallHandler = sinon.stub();
      element.getHLJS().then(firstCallHandler);
      flush(() => {
        assert.isTrue(firstCallHandler.called);
        assert.isTrue(firstCallHandler.calledWith(hljsStub));
        done();
      });
    });

    test('configures hljs', done => {
      element.getHLJS().then(() => {
        assert.isTrue(window.hljs.configure.calledOnce);
        done();
      });
    });
  });

  suite('_getHLJSUrl', () => {
    suite('checking _getLibRoot', () => {
      let root;

      setup(() => {
        sandbox.stub(element, '_getLibRoot', () => root);
      });

      test('with no root', () => {
        assert.isNull(element._getHLJSUrl());
      });

      test('with root', () => {
        root = 'test-root.com/';
        assert.equal(element._getHLJSUrl(),
            'test-root.com/bower_components/highlightjs/highlight.min.js');
      });
    });
  });
});
</script>