[英]How can we stub and respond to a particular function call in sinon js
假設我們有一個功能測試,它以不同的值被多次調用。 我們如何將其存入特定的參數值。 像下面
function test(key, cb) {
// code
cb();
}
test('one', function(arg){console.log(arg);});
test('two', function(arg){console.log(arg);});
test('three', function(arg){console.log(arg);});
我只想對它進行調用以“ two”調用,以驗證是否用“ two”調用過一次,並且還用arg執行回調以檢查函數調用后的狀態。
找不到任何api解決方案,因此使用了以下方法:
test = sinon.stub();
var calls = test.getCalls().filter(function(call) {
return call.args[0] === 'two';
});
expect(calls.length).to.be.equal(1);
// to execute callback calls[0].args[0](arg1, arg2)
您可以使用sinon通過使用stub.withArgs()
定位調用並讓其他人通過來完成所有這些操作。 例如:
const sinon = require('sinon')
let myObj = {
write: function(str, cb){
console.log("original function with: ", str)
cb(str)
}
}
// Catch only calls with 'two' argument
let stub = sinon.stub(myObj, 'write').withArgs("two")
stub.callsFake(arg => console.log("CALLED WITH STUB: ", arg))
// call the caught function's callback
stub.yields('two')
// let all others proceed normally
myObj.write.callThrough();
myObj.write("one", (str) => console.log("callback with: ", str))
myObj.write("two", (str) => console.log("callback with: ", str))
myObj.write("three", (str) => console.log("callback with: ", str))
// Make whatever assertions you want:
sinon.assert.calledOnce(stub) // passes
結果是:
original function with: one
callback with: one
callback with: two
CALLED WITH STUB: two
original function with: three
callback with: three
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