如何通过在函数中提取部分代码或在 Jest 中使用它来减少“应该抛出”测试中的重复代码

问题描述 投票:0回答:0

我被要求通过使用 it.each 或创建一个函数来减少测试中的重复。我不知道该怎么做。我在测试套件中还有其他预计不会出错的功能。我假设我可以将下面两个重复的断言放在辅助函数中,但如果您有更好的建议,请告诉我。谢谢。

expect(<jest.Mock>fetch).not.toHaveBeenCalled();
expect(e).toBeInstanceOf(TypeError);

测试文件:

it('should throw if no args were passed', async () => {
            expect.assertions(3);
            return readPricing().catch((e: Error) => {
                expect(<jest.Mock>fetch).not.toHaveBeenCalled();
                expect(e).toBeInstanceOf(TypeError);
                expect(e.message).toBe(
                    `The 'products' information is required to successfully be able to execute this request.`
                );
            });
        });

        it('should throw if no product IDs were passed', () => {
            expect.assertions(3);
            const noIdData = {
                products: [{ salesPrice: '60.00' }, { salesPrice: '80.00' }],
            };
            // @ts-expect-error
            return readPricing(noIdData).catch((e: Error) => {
                expect(<jest.Mock>fetch).not.toHaveBeenCalled();
                expect(e).toBeInstanceOf(TypeError);
                expect(e.message).toBe(`The 'productId' is required to successfully be able to execute this request.`);
            });
        });

        it('should throw if an empty array of products was passed', () => {
            expect.assertions(3);
            const noIdData = { products: [] };
            return readPricing(noIdData).catch((e: Error) => {
                expect(<jest.Mock>fetch).not.toHaveBeenCalled();
                expect(e).toBeInstanceOf(TypeError);
                expect(e.message).toBe(
                    `The 'products' information is required to successfully be able to execute this request.`
                );
            });
        });

我尝试使用它。每个但未能成功设置它,我不确定给定的输入是否可行。

jestjs ts-jest salesforce-lightning lwc
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