Question

场景：

我有一个带有方法的类，其中一个方法返回一个表达式树。我该如何模拟该方法。

代码：

public Expression<Func<SpecFinderDataModel, bool>> BuildDynamicWhereClause(DataTableAjaxPostModel model)
    {
        var predicate = PredicateBuilder.New<SpecFinderDataModel>(true);
        if (_stringValidator.IsValid(model.search.value))
            predicate = _basicSearchService.DoSearch(model.search.value, predicate);
        var searchData = model.columns.Where(x => x.search.value != null);
        predicate = _advancedSearchService.DoSearch(model.isActive, searchData, predicate);
        return predicate;
    }

此处_advancedSearchService.DoSearch()会返回Expression<Func<SpecFinderDataModel, bool>>。我写了下面的测试

测试：

[TestMethod]
[TestCategory("BuildDynamicWhereClause")]
public void BuildDynamicWhereClauseTest()
{
    DataTableAjaxPostModel searchmodel = new DataTableAjaxPostModel()
    {
        columns = new List<Column>()
        {
            new Column() {
                data ="Status",
                orderable ="true",
                searchable ="true",
                search = new Search() {
                    regex = "false",
                    value ="TestStatus"
                }
            }
        },
        search = new Search()
    };

    IFinderBuildQueryFlow _finderBuildQueryFlow = new FinderBuildQueryFlow(
        _mockBasicSearchService.Object, _mockAdvancedSearchService.Object, _mockStringValidator.Object);

    var predicate = PredicateBuilder.New<SpecFinderDataModel>(true);
    _mockStringValidator.Setup(x => x.IsValid(searchmodel.search.value)).Returns(false);
    var searchData = searchmodel.columns.Where(x => x.search.value != null);
    _mockAdvancedSearchService.Setup(x => x.DoSearch(searchmodel.isActive, searchData, predicate).Compile()(model)).Returns(true);
    var test = _finderBuildQueryFlow.BuildDynamicWhereClause(searchmodel).Compile()(model);
}

之前的一切 _mockAdvancedSearchService.Setup(x => x.DoSearch(searchmodel.isActive, searchData, predicate).Compile()(model)).Returns(true);工作正常。但是我不知道如何模拟advancedSearch.DoSearch()方法。

任何建议都会很有帮助。谢谢

更新＃1：

这是执行该行代码时的错误

更新＃2：

因此在此谓词将返回为null。

并在测试中我收到这样的错误

Answer 1

如果要模拟对_advancedSearchService.DoSearch（）的调用，则必须按以下步骤进行设置：

const arr = [{image_id: "80", imagename: "Image1",firstx: "267", firsty: "403"}, 
  {image_id: "80", imagename: "Image1",firstx: "320", firsty: "470"}, 
  {image_id: "80", imagename: "Image2",firstx: "126", firsty: "237"}
];
console.log(arr.map(Object.values));

鉴于Expression<Func<SpecFinderDataModel, bool>> query = model => true; _mockAdvancedSearchService.Setup(x => x.DoSearch(searchmodel.isActive, It.IsAny<IEnumerable<Column>>(), It.IsAny<Expression<Func<SpecFinderDataModel, bool>>>())).Returns(query);参数是在方法本身中创建的，您将需要为其接受任何值。

鉴于searchdata参数是在方法本身中创建的，您将需要为其接受任何值。

模拟在类中返回表达式树的函数

1 个答案: