如何测试方法是否在 Jasmine 中只被调用过一次而不是第二次？

Question

我正在测试应该调用一次方法并防止使用 jasmine 进行任何后续调用的机制，我可以通过附加断点看到该方法没有被第二次调用，但是 jasmine 测试失败。我认为这与 spy 未设计用于多次检查有关。
对于特定情况，什么是适当的解决方案？

JSfiddle of Code that is being tested我不知道如何正确地进行 jasmine 测试 jsfiddle（我使用的 Jasmine 版本是 1.3.1，而测试模板是 1.2.0）。

测试如下：

 it("Invoking OnPreQuery will add event listener for OnTheMoveViewPreLoad event. Triggering OnTheMoveViewPreLoad twice will call getChildrenForMasterRecordList only first time", function () {
            AddTreeSettingsObjectToBC({ bc: bc, Tree: { IncludeChildren: true} });
            ComposeMockPageObjWithObservableFieldsWithChildren();
            var preQuerySpy = spyOnEvent(onTheMove.PageDataRoles, 'OnPreQuery');
            $(onTheMove.PageDataRoles).trigger('OnPreQuery', { knockoutContextName: 'bc' });
            expect('OnPreQuery').toHaveBeenTriggeredOn(onTheMove.PageDataRoles);
            expect(preQuerySpy).toHaveBeenTriggered();
            var getChildrenForMasterRecordListSpy = spyOn(window, 'getChildrenForMasterRecordList');
            $(onTheMove.PageDataRoles).trigger('OnTheMoveViewPreLoad', { knockoutContextName: 'bc' });
            expect(getChildrenForMasterRecordListSpy).toHaveBeenCalled();
            $(onTheMove.PageDataRoles).trigger('OnTheMoveViewPreLoad', { knockoutContextName: 'bc' });
            expect(getChildrenForMasterRecordListSpy).not.toHaveBeenCalled();
        });

正在测试的代码： HTML

<div data-role="page"></div>

Javascript

var onTheMove = function(){};
$.extend(onTheMove,{
    NullValue : "null",
    PageDataRoles : 'div[data-role="page"], div[data-role="dialog"]',
    OnTheMovePrefix : 'OnTheMove_'
    });

$(document).on('OnPreQuery', onTheMove.PageDataRoles, function (e, options) {
    var isChildAttachmentQueued = true;
    var knockoutContextName = options.knockoutContextName;
    if (TreeEnabled(knockoutContextName)) {
        var isModelReadyToAttachChildren = function () {
            var isReady = false;
            if (PageObj[knockoutContextName] != undefined) {
                isReady = (PageObj[knockoutContextName]().length > 0) && isChildAttachmentQueued;
            }

            return isReady;
        };
        var treeSettings = eval(knockoutContextName).Tree;
        treeSettings.knockoutContextName = knockoutContextName;
        $(onTheMove.PageDataRoles).on('OnTheMoveViewPreLoad', function (e, options) {
            if (isModelReadyToAttachChildren()) {
                getChildrenForMasterRecordList({
                    parentTable: eval(knockoutContextName).primaryTableName,
                    knockoutContextName: treeSettings.knockoutContextName,
                    parentIdColumn: treeSettings.ParentIdColumn,
                    masterIdColumn: treeSettings.MasterIdColumn
                });
                isChildAttachmentQueued = false;
            }
        });
    }
});
function getChildrenForMasterRecordList(options) {
    console.log('beep');
}

Answer 1

我自己想通了，spy 有 callCount 属性，每次调用都会自动递增 1。

    it("Invoking OnPreQuery will add event listener for OnTheMoveViewPreLoad event. Triggering OnTheMoveViewPreLoad twice will call getChildrenForMasterRecordList only first time", function () {
        AddTreeSettingsObjectToBC({ bc: bc, Tree: { IncludeChildren: true} });
        ComposeMockPageObjWithObservableFieldsWithChildren();
        var preQuerySpy = spyOnEvent(onTheMove.PageDataRoles, 'OnPreQuery');
        $(onTheMove.PageDataRoles).trigger('OnPreQuery', { knockoutContextName: 'bc' });
        expect('OnPreQuery').toHaveBeenTriggeredOn(onTheMove.PageDataRoles);
        expect(preQuerySpy).toHaveBeenTriggered();
        var getChildrenForMasterRecordListSpy = spyOn(window, 'getChildrenForMasterRecordList');
        $(onTheMove.PageDataRoles).trigger('OnTheMoveViewPreLoad', { knockoutContextName: 'bc' });
        expect(getChildrenForMasterRecordListSpy).toHaveBeenCalled();
        $(onTheMove.PageDataRoles).trigger('OnTheMoveViewPreLoad', { knockoutContextName: 'bc' });
        expect(getChildrenForMasterRecordListSpy.callCount).toEqual(1);
    });

根据评论

在 Jasmine 2.0 中

expect(object.func.calls.count()).toBe(1);

Answer 2

toHaveBeenCalledTimes(1)

现在让这变得容易多了。

 expect(yourSpy).toHaveBeenCalledTimes(1);