public TestResultViewModel(ITestResultService testResultService)
        {
            _testResultService = testResultService;

            _userTestModel = TinyTempCache.Get <Type, UserTestModel>(typeof(UserTestModel));

            _testResults = _testResultService.GetResults(new TestKey
            {
                UnitName   = _userTestModel.UnitName,
                LessonName = _userTestModel.LessonName
            });
        }