私は学校でReduxを勉強しています。そのようなテストでは、ビルディングブロックの理解に役立つベンチマークがあることを確認しています。Reduxの "Reducer"はデフォルトで初期状態を返し、デフォルト値を返すことができますか?
私はReducer
関数を作成している部分までですが、ほとんど完了しました\o/
しかし、私は1つのテストに合格することはできません。
1) returns the initial state by default
とコンソール下のバック吐く...
Reducer returns the initial state by default:
AssertionError: expected undefined to be an object at Context. (tests/redux.spec.js:103:49)
は私のテストはすべて、1は、例えば、輸入のために責任を負うことになるの懸念のいくつかを扱うなど、アクションの種類を作成するしかしないからだと考えて。だから多分私はテストが提供していない何かを逃している?とにかくここ
は私の減速ファイルです:
import pet from "../components/PetPreview";
import { createStore } from "redux";
import { adoptPet, previewPet, addNewDog, addNewCat } from "./action-creators";
// ACTION TYPES
const PREVIEW_PET = "PREVIEW_PET";
const ADOPT_PET = "ADOPT_PET";
const ADD_NEW_DOG = "ADD_NEW_DOG";
const ADD_NEW_CAT = "ADD_NEW_CAT";
// INTITIAL STATE
const initialState = {
dogs: [
{
name: "Taylor",
imgUrl: "src/img/taylor.png"
},
{
name: "Reggie",
imgUrl: "src/img/reggie.png"
},
{
name: "Pandora",
imgUrl: "src/img/pandora.png"
}
],
cats: [
{
name: "Earl",
imgUrl: "src/img/earl.png"
},
{
name: "Winnie",
imgUrl: "src/img/winnie.png"
},
{
name: "Fellini",
imgUrl: "src/img/fellini.png"
}
]
// These dogs and cats are on our intial state,
// but there are a few more things we need!
};
export default function reducer(prevState = initialState, action) {
var newState = Object.assign({}, prevState)
console.log('initialState', typeof initialState)
switch (action.type) {
case PREVIEW_PET:
// console.log('newState', newState)
return Object.assign({}, prevState, {
petToPreview: action.pet
});
break
case ADOPT_PET:
return Object.assign({}, prevState, {
petToAdopt: action.pet
});
break
case ADD_NEW_DOG:
// console.log('action', action.dog)
// console.log('prevState.dogs', prevState.dogs)
newState.dogs = prevState.dogs.concat([action.dog])
return newState;
break
case ADD_NEW_CAT:
// console.log('action', action.dog)
// console.log('prevState.dogs', prevState.dogs)
newState.cats = prevState.cats.concat([action.cat])
return newState;
break;
default:
return prevState;
}
return initialState
}
あなたは、私はそれはそれをすべきではないinitialState
戻っていswitch
ブロックの後に見ることができるように?事前に
import { expect } from "chai";
import { createStore } from "redux";
// You will write these functions
import {
previewPet,
adoptPet,
addNewDog,
addNewCat
} from "../src/store/action-creators";
import reducer from "../src/store/reducer";
const DOGS = [
{
name: "Taylor",
imgUrl: "src/img/taylor.png"
},
{
name: "Reggie",
imgUrl: "src/img/reggie.png"
},
{
name: "Pandora",
imgUrl: "src/img/pandora.png"
}
];
const CATS = [
{
name: "Earl",
imgUrl: "src/img/earl.png"
},
{
name: "Winnie",
imgUrl: "src/img/winnie.png"
},
{
name: "Fellini",
imgUrl: "src/img/fellini.png"
}
];
function getRandomPet(pets) {
return pets[Math.floor(Math.random() * pets.length)];
}
describe("Action creators",() => {
describe("previewPet",() => {
it("returns properly formatted action",() => {
const pet = getRandomPet(DOGS);
expect(previewPet(pet)).to.be.deep.equal({
type: "PREVIEW_PET",
pet: pet
});
});
});
describe("adoptPet",() => {
it("returns properly formatted action",() => {
const pet = getRandomPet(DOGS);
expect(adoptPet(pet)).to.be.deep.equal({
type: "ADOPT_PET",
pet: pet
});
});
});
describe("addNewDog",() => {
it("returns properly formatted action",() => {
const pet = getRandomPet(DOGS);
expect(addNewDog(pet)).to.be.deep.equal({
type: "ADD_NEW_DOG",
dog: pet
});
});
});
describe("addNewCat",() => {
it("returns properly formatted action",() => {
const pet = getRandomPet(CATS);
expect(addNewCat(pet)).to.be.deep.equal({
type: "ADD_NEW_CAT",
cat: pet
});
});
});
}); // end Action creators
describe("Reducer",() => {
let store;
beforeEach("Create the store",() => {
// creates a store (for testing) using your (real) reducer
store = createStore(reducer);
});
it("returns the initial state by default",() => {
// In addition to dogs and cats, we need two more fields
expect(store.getState().petToPreview).to.be.an("object");
expect(store.getState().petToAdopt).to.be.an("object");
});
describe("reduces on PREVIEW_PET action",() => {
it("sets the action's pet as the petToPreview on state (without mutating the previous state)",() => {
const prevState = store.getState();
const pet = getRandomPet(DOGS);
const action = {
type: "PREVIEW_PET",
pet: pet
};
store.dispatch(action);
const newState = store.getState();
// ensures the state is updated properly - deep equality compares the values of two objects' key-value pairs
expect(store.getState().petToPreview).to.be.deep.equal(pet);
// ensures we didn't mutate anything - regular equality compares the location of the object in memory
expect(newState.petToPreview).to.not.be.equal(prevState.petToPreview);
});
});
describe("reduces on ADOPT_PET action",() => {
it("sets the action's pet as the petToAdopt on state (without mutating the previous state)",() => {
const prevState = store.getState();
const pet = getRandomPet(DOGS);
const action = {
type: "ADOPT_PET",
pet: pet
};
store.dispatch(action);
const newState = store.getState();
expect(newState.petToAdopt).to.be.deep.equal(pet);
expect(newState.petToAdopt).to.not.be.equal(prevState.petToAdopt);
});
});
describe("reduces on ADD_NEW_DOG action",() => {
it("adds the new dog to the dogs array (without mutating the previous state)",() => {
const prevState = store.getState();
const pet = getRandomPet(DOGS);
const action = {
type: "ADD_NEW_DOG",
dog: pet
};
store.dispatch(action);
const newState = store.getState();
expect(newState.dogs.length).to.be.equal(prevState.dogs.length + 1);
expect(newState.dogs[newState.dogs.length - 1]).to.be.deep.equal(pet);
expect(newState.dogs).to.not.be.equal(prevState.dogs);
});
});
describe("reduces on ADD_NEW_CAT action",() => {
it("adds the new cat to the cats array (without mutating the previous state)",() => {
const prevState = store.getState();
const pet = getRandomPet(CATS);
const action = {
type: "ADD_NEW_CAT",
cat: pet
};
store.dispatch(action);
const newState = store.getState();
expect(newState.cats.length).to.be.equal(prevState.cats.length + 1);
expect(newState.cats[newState.cats.length - 1]).to.be.deep.equal(pet);
expect(newState.cats).to.not.be.equal(prevState.cats);
});
});
describe("handles unrecognized actions",() => {
it("returns the previous state",() => {
const prevState = store.getState();
const action = {
type: "NOT_A_THING"
};
store.dispatch(action);
const newState = store.getState();
// these should be the same object in memory AND have equivalent key-value pairs
expect(prevState).to.be.an("object");
expect(newState).to.be.an("object");
expect(newState).to.be.equal(prevState);
expect(newState).to.be.deep.equal(prevState);
});
});
}); // end Reducer
ありがとう:
以下はredux.spec.js
ファイルです!
ちょっと、正確な問題を理解できませんでした。初期状態で初期状態に戻したいのですか?もし何かが起こっているなら、あなたはさらに説明できますか? – mindaJalaj
@mindaJalaj何が起こっているのは、最後のテストが通過していないようです。基本的に 'デフォルトで初期状態を返す'は渡されない。 –
@jaihindhreddyが質問に美しく答えてくれたと思いますが、それは機能していますか? – mindaJalaj