[英]Jest test function call inside useEffect
我有以下測試:
it("should call runValidation when listen_to is set", async () => {
const updatedProps = {
item: {
...props.item,
attributes: {
...props.item.attributes,
},
},
validation: {
...props.validation,
setValue: jest.fn(),
runValidation: jest.fn(),
listenFieldValues: jest.fn(),
},
};
const spyOnValidation = jest.spyOn(
updatedProps.validation,
"runValidation"
);
render(<Average item={updatedProps.item} validation={props.validation} />);
expect(spyOnValidation).toHaveBeenCalled();
});
這是與之相關的用戶界面:
export const Average = ({ item, validation }: ComponentProps): JSX.Element => {
const { attributes, name } = item;
const hide_cents = attributes?.hide_cents;
const [price, setPrice] = useState<number>(Number(item.value || 0));
useEffect(() => {
if (attributes?.listen_to) {
console.log("validation: ", validation);
setupListenData({ item, validation, callback: setPrice });
validation.runValidation();
}
}, [item, attributes, validation]);
...
我正在嘗試測試在useEffect
內部調用了validation.runValidation()
但測試失敗:調用次數 0
我也嘗試過使用waitFor
但無論有多少次haveBeenCalledTimes(3) or haveBeenCalledTimes(100)
測試都通過了
您是否嘗試在此測試中創建一個模擬函數,然后將模擬函數分配給updatedProps.validation.runValidation
,然后您只期望調用模擬函數?
it("should call runValidation when listen_to is set", () => {
const mockRunValidation = jest.fn();
const updatedProps = {
item: {
...props.item,
attributes: {
...props.item.attributes,
},
},
validation: {
...props.validation,
setValue: jest.fn(),
runValidation: mockRunValidation,
listenFieldValues: jest.fn(),
},
};
render(<Average item={updatedProps.item} validation={props.validation} />);
expect(mockRunValidation).toHaveBeenCalled();
});
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