Load.fromDict(moduleDict1);

    assert.strictEqual(mtl0.href, '/foo');
    assert.isUndefined(mtl0.filename);
    assert.strictEqual(mtl1.filename, 'foo.html');
    assert.isUndefined(mtl1.href);
  });

  test('moduleToLoadToStringTest', function() {
    const mtl0 = new tr.mre.ModuleToLoad('/foo');
    const mtl1 = new tr.mre.ModuleToLoad(undefined, 'foo.html');

    assert.strictEqual(
        mtl0.toString(),
        'ModuleToLoad(href="/foo")');
    assert.strictEqual(
        mtl1.toString(),
        