Unveiling Typescript's Secrets: A Guide to Monitoring an Ajax Call

Currently, I am working on writing a unit test to verify if an ajax call has been successfully made. The code snippet in question is quite straightforward:

it('test spycall',()=>{
spyOn($,"ajax");
//my method call which uses ajax internally
MyFunc();
expect($.ajax.calls.mostRecent().args[0]["url"].toEqual("myurl");
});

However, upon running the test, I encounter this error message:

The property 'calls' does not exist on the type '{settings:jqueryAjaxSettings):jQueryXHR;(url:string, settings?:JQueryAjaxSettings}

ajaxtypescriptjasminespy

Answer №1

$.ajax.calls is a feature of the Jasmine testing framework, distinct from JQuery itself. Jasmine-Jquery plugin extends JQuery's capabilities to facilitate testing ajax calls.

The issue arises when your .d.ts typescript definition file does not recognize Jasmine's functions.

To address this problem, you could explore options such as:

  • Checking for an updated version of the JQuery .d.ts file that includes Jasmine's functions
  • Creating a new .d.ts file that incorporates these functionalities (a path I would recommend taking)
  • Alternatively, you can override the typescript definition by specifying $.ajax as any, or excluding the typescript definition entirely in your testing codebase and declaring $ as any.

Answer №2

If you encounter an error, there are two solutions to fix it:

// Solution 1
expect(($.ajax as any).calls.mostRecent().args[0].url).toEqual("myurl");

// Solution 2
let ajaxSpy = spyOn($,"ajax");
expect(ajaxSpy.calls.mostRecent().args[0].url).toEqual("myurl");

Alternatively, you can opt for partial matching:

expect(($.ajax as any).calls.mostRecent().args).toEqual([
  jasmine.objectContaining({url: "myurl"})
]);

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