polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader_test.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-lib-loader</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-lib-loader.html">

<script>void(0);</script>

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

<script>
  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>