如何使用相同的函数检查"toHaveBeenColledWith"

Question

我试图检查它传递的返回值，但当我期望toHaveBeenCalledWith时，它会失败，调用次数为：0。有人能告诉我这个代码出了什么问题吗？

describe('buildAggregateParams', () => {
// Preparing
const schemaParams = {
filterKeyMap: {
id: '_id',
name: 'test_name',
no: '_no',
},
sortKeyMap: {
date: '_created_date',
no: '_no',
name: 'test_name',
status: '_status_is_active',
},
lookups: [
{
from: 'sample',
localField: 'test_id',
foreignField: '_id',
as: 'test_id',
model: 'sampleModel',
},
],
unwinds: [],
queryKeys: ['page', 'size', 'sort', 'order_by', 'from', 'to', 'status'],
};
const entityName = 'test_collection';

it('test 1.', async () => {
// Preparing
const request = ({
query: {
price_fromss: '2',
},
originalUrl: '/api/m3/product/all/?price_fromss=2',
} as unknown) as Request;
const expectBuildAggregateParamsResult = {
filters: { test_collection_status_is_active: true },
pageSort: { limit: 25, skip: 0, sort: {} },
filterKeyMap: { id: '_id', name: 'test_name', no: '_no' },
sortKeyMap: {
date: '_created_date',
no: '_no',
name: 'test_name',
status: '_status_is_active',
},
lookups: [
{
from: 'sample',
localField: 'test_id',
foreignField: '_id',
as: 'test_id',
model: 'sampleModel',
},
],
unwinds: [],
queryKeys: ['page', 'size', 'sort', 'order_by', 'from', 'to', 'status'],
};
const ff = jest.spyOn(ControllerUtility, 'buildAggregateParams'); 
// Executings
const result = await buildAggregateParams(request as Request, schemaParams, entityName, {
price_fromss: jest.fn(),
});
expect(result).toEqual(expectBuildAggregateParamsResult); // Passed
expect(ff).toHaveBeenCalledWith(request as Request, schemaParams, entityName, {
price_fromss: jest.fn(),
}); //Failed
});
});

Answer 1

price_fromss不是同一个函数jest.fn() !== jest.fn()。为了通过相等性检查，它应该是相同的：

const price_fromss = jest.fn();
const result = await buildAggregateParams(request as Request, schemaParams, entityName, {
price_fromss
});
expect(ff).toHaveBeenCalledWith(request as Request, schemaParams, entityName, {
price_fromss
});

或者对于不可能保留对函数的引用的情况：

expect(ff).toHaveBeenCalledWith(request as Request, schemaParams, entityName, {
price_fromss: expect.any(Function)
});

断言没有起到很好的作用，因为它测试的是您刚刚编写的行，而不是单元。