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[英]How to unit test a callback function was called on a React component using Cypress
[英](React Component Tests) How to unit test if a function from a different module is called in componentDidMount using jasmine
我正在為React Component編寫單元測試。 如何編寫單元測試以檢查來自不同模塊的函數是否在茉莉花的componentDidMount中被調用。 這是我的組件:
import {differentModuleFunc} from "someModule"; class MyComponent extends React.Component { componentDidMount() { differentModuleFunc(); } render() { return <div> TestDiv </div>; } }
我對組件的單元測試如下所示:
describe("MyComponent", () => { it("differentModuleFunc should have been called", (done) => { const spy = spyOn(MyComponent, "differentModuleFunc"); myComponentDiv = TestUtils.renderIntoDocument(<MyComponent/>); expect(myComponentDiv).toBeDefined(); expect(spy).toHaveBeenCalled(); }); });
謝謝。
您可以模擬該函數,然后斷言調用計數。 使用您的示例,您可以執行以下操作:
import {differentModuleFunc} from "someModule"; class MyComponent extends React.Component { componentDidMount() { differentModuleFunc(); } render() { return <div> TestDiv </div>; } }
您在測試中導入“ someModule”,對其進行模擬,然后斷言調用計數。
import {differentModuleFunc} from "someModule"; // import the function jest.mock('someModule', () => ({ differentModuleFunc: jest.fn() })) // mocks the function describe("MyComponent", () => { it("differentModuleFunc should have been called", (done) => { const spy = spyOn(MyComponent, "differentModuleFunc"); myComponentDiv = TestUtils.renderIntoDocument(<MyComponent/>); expect(myComponentDiv).toBeDefined(); expect(spy).toHaveBeenCalled(); expect(differentModuleFunc.mock.calls.length).toBe(1) // assert call count }); });
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