1年間単体テストを書き続けた現場から送る Vue Component のテスト / Vue Component Test

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$PNQPOFOUͷςετ ॻ͍͍ͯΔਓ

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ͦͷͨΊʹ ݱ৔Ͱ΍͍ͬͯΔ͜ͱ

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ԿΛςετ͢Δʁ

֎෦͔ΒݟͨৼΔ෣͍Λ ςετ͢Δ

DPNQPOFOUͷςετ΋ ͦ͏Ͱͳ͍ςετͱ ߟ͑ํ͸Ұॹ

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$PNQPOFOUͰ͍͏ͱʁ

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NPVOUPSTIBMMPXNPVOU $PNQPOFOU NPVOU $IJME $PNQPOFOU $PNQPOFOU $IJME $PNQPOFOU TIBMMPXNPVOU <template>
<div> <h1>Parent</h1> <child/> </div> </template> <template> <div> <h1>Parent</h1>  </div> </template>

wجຊతʹNPVOU wʮ֎෦͔ΒΈͨৼΔ෣͍ʯ wʮઃܭͷՄಈҬΛ֬อʯ wର৅DPNQPOFOU wSPVUFS͔ΒಡΈࠐΉ͍ΘΏΔ1BHF $PNQPOFOU wෳࡶͳPSڞ௨Ͱ࢖༻͢Δ$PNQPOFOU w1BHF$PNQPOFOUͰΧόʔ͕໘౗ ࠓͷϓϩδΣΫτͰ͸

Ͳ͏΍ͬͯςετ͢Δʁ

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-JGFDZDMF ʹର͢Δςετίʔυ

-JGFDZDMFͷςετ 7VFY "DUJPO &WFOU )5.- $44 $PNQPOFOU -JGFDZDMF

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࣮૷ྫ -JGFDZDMF created () { this.loadPosts() }, methods: { ...mapActions(['fetchPosts']),
async loadPosts () { this.message = 'ಡΈࠐΈத...' try { await this.fetchPosts() } finally { this.message = ‘' } } }, .FUIPE ݺͼग़͠

async loadPosts () { this.message = 'ಡΈࠐΈத...' try { await this.fetchPosts() } finally { this.message = ‘' } } }, දࣔมߋ

async loadPosts () { this.message = 'ಡΈࠐΈத...' try { await this.fetchPosts() } finally { this.message = ‘' } } }, "DUJPO EJTQBUDI

ςετྫ -JGFDZDMF // ϩʔΧϧͳVueίϯετϥΫλʹVuexΛΠϯετʔϧ const localVue = createLocalVue() localVue.use(Vuex) beforeEach(()
=> { // fetchPostsΞΫγϣϯͷಈ࡞֬ೝͷͨΊͷVuexपΓͷઃఆ actions = { fetchPosts: sinon.stub() // fetchPostsΞΫγϣϯͷϞοΫ } store = new Vuex.Store({ actions }) wrapper = mount(Posts, {store, localVue }) }) ͓ܾ·Γ

ςετྫ -JGFDZDMF // ϩʔΧϧͳVueίϯετϥΫλʹVuexΛΠϯετʔϧ const localVue = createLocalVue() localVue.use(Vuex) beforeEach(()
=> { // fetchPostsΞΫγϣϯͷಈ࡞֬ೝͷͨΊͷVuexपΓͷઃఆ actions = { fetchPosts: sinon.stub() // fetchPostsΞΫγϣϯͷϞοΫ } store = new Vuex.Store({ actions }) wrapper = mount(Posts, {store, localVue }) }) TUPSFͷϞοΫΛ ࡞੒

ςετྫ -JGFDZDMF it('loadingදࣔ͞ΕΔ͜ͱ', async () => { expect(wrapper.text()).to.contain('ಡΈࠐΈத...') }) it('fetchPosts͕dispatch͞ΕΔ͜ͱ',
() => { sinon.assert.calledOnce(actions.fetchPosts) }) it('dispatch੒ޭ͢Δͱɺloadingද͕ࣔফ͑Δ͜ͱ', async () => { actions.fetchPosts.resolves() await flushPromises() expect(wrapper.text()).not.to.contain('ಡΈࠐΈத...') })

w࣮ࡍʹ͸ɺදࣔʹඞཁͳσʔλऔಘͷͨΊʹ EJTQBUDI͢Δ͙Β͍ w͜ΕΛςετͯ͠΋ಘΒΕΔ҆৺ײ͸௿͍ wଞͷςετΛॻ͍ͨ΄͏͕Α͍ w-JGFDZDMFIPPL͸NPDLԽͯ͠ɺଞͷςετ ͷअຐʹͳΒͳ͍Α͏ʹ͢Δͷ΋ͭͷख -JGFDZDMFͷςετΛͯ͠Έͯ

1SPQT7VFY4UBUF ʹର͢Δςετίʔυ

1SPQT7VFY4UBUFͷςετ )5.- $44 $PNQPOFOU 7VFY 4UBUF 1SPQT

࣮૷ྫ දࣔ <template> <div v-if="posts.length === 0">·ͩ౤ߘ͸͋Γ·ͤΜ</div> <table v-else> <thead>
<tr> <td>λΠτϧ</td> <td>಺༰</td> </tr> </thead> <tbody> <tr v-for="post in posts" :key="post.id"> <td>{{post.title}}</td> <td>{{post.body}}</td> </tr> </tbody> </table> </template> ݅ͷͱ͖ දࣔΛม͑Δ

ςετྫ ୯७ͳBTTFSU describe('౤ߘ͕0݅ͷ৔߹', () => { beforeEach(() => wrapper.setProps({posts: []})
it('0݅ͷද͕ࣔ͞Ε͍ͯΔ͜ͱ', () => { expect(wrapper.text()).to.contain('·ͩ౤ߘ͸͋Γ·ͤΜ') }) }) describe('౤ߘ͕1݅Ҏ্ͷ৔߹', () => { const post = {id: 1, title: ‘λΠτϧ’, body: ‘body’} beforeEach(() => wrapper.setProps({posts: [post]}) it('౤ߘͷ಺༰͕දࣔ͞Ε͍ͯΔ͜ͱ', () => { expect(wrapper.text()).to.contain(post.title) }) })

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4OBQTIPU5FTUJOH

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4OBQTIPU5FTUJOH

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7JTVBM5FTUJOH

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ࢲ͕࠾༻ͨ͠ ࠷ߴͷ7JTVBM5FTUJOHͷํ๏ ʙ1SPQT7VFY4UBUFฤʙ

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4UPSZCPPLͰQSPQTΛ౉͢ storiesOf('propsΛड͚औΔcomponent', module) .add('ۭͷͱ͖', () => ({ components: { PostsByProps
}, template: '<posts-by-props :posts=posts/>', data: () => ({ posts: [] }) })) .add('౤ߘ͕͋Δͱ͖', () => ({ components: { PostsByProps }, template: '<posts-by-props :posts=posts/>', data: () => ({ posts: [{id: 1, title: ‘title', body: 'ϘσΟ'}] }) }))

4UPSZCPPLͰ7VFY4UBUFΛ౉͢ storiesOf('vuex storeΛड͚औΔcomponentྫ', module) .add('ۭͷͱ͖', () => ({ components: {
PostsByStore }, template: '<posts-by-store />', store: new Vuex({ state: () => ({ posts: [] }) }) })) .add('౤ߘ͕͋Δͱ͖', () => ({ components: { PostsByStore }, template: '<posts-by-store />', store: new Vuex({ state: () => ({ posts: [{id: 1, title: 'λΠτϧ1', body: 'ϘσΟ'}] }) }) }))

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ݱ৔ͷίʔυ import { state, getters, mutations, actions } from ‘@/store'
function createStubStore () { const store = new Vuex.Store({state, getters, mutations, actions}) sinon.stub(store, 'dispatch').resolves() store.state.posts = [{id: 1, title: 'λΠτϧ1', body: 'ϘσΟ'}] // ࣮ࡍ͸͜͜ͷstate४උ͕͍ͬͺ͍͋Δ return store } const emptyPostsStore = createStubStore() emptyPostsStore.state.posts = [] storiesOf('Posts', module) .add('ۭͷͱ͖', () => ({ components: { Posts }, template: '<posts/>', store: emptyPostsStore, })) ຊ෺ͷTUPSFΛϕʔεʹ EJTQBUDINFUIPEͱ TUBUFΛϞοΫԽ͢Δ

ݱ৔ͷίʔυ import { state, getters, mutations, actions } from ‘@/store'
function createStubStore () { const store = new Vuex.Store({state, getters, mutations, actions}) sinon.stub(store, 'dispatch').resolves() store.state.posts = [{id: 1, title: 'λΠτϧ1', body: 'ϘσΟ'}] // ࣮ࡍ͸͜͜ͷstate४උ͕͍ͬͺ͍͋Δ return store } const emptyPostsStore = createStubStore() emptyPostsStore.state.posts = [] storiesOf('Posts', module) .add('ۭͷͱ͖', () => ({ components: { Posts }, template: '<posts/>', store: emptyPostsStore, })) ൚༻తͳ TUPSFΛඍௐ੔ͯ͠ TUPSZ΁

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TUPSZCPPLSFHTVJUͷ։ൃϑϩʔ

TUPSZCPPLSFHTVJUͷ։ൃϑϩʔ #FGPSF "GUFS ࠩ෼ 13"QQSPWF

wDPNQPOFOU୯ҐͰͷςετ͕Մೳ w։ൃϑϩʔ͕ීஈͷ։ൃͱҰॹ wTUPSZCPPL͕؆୯ wσβΠφ͞Μ΋ฤूͯ͘͠ΕΔ wແྉ w༗ঈπʔϧ΋͍ͬͺ͍͋Δ ࠷ߴϙΠϯτ

wϦϑΝΫλ࣌΋ػೳ௥Ճ࣌΋ɺͱͯ΋҆৺ wϨϏϡʔґཔ΍ϨϏϡʔͷෛՙ͕Լ͕Δ w7JTVBM5FTUͷ݁Ռ͚ͩͰͳ͘ɺͦΕͱ͸ผʹ $*Ͱ13͝ͱʹTUPSZCPPL΋σϓϩΠ wϨϏϡʔ࣌ʹຖճDIFDLPVU΍ɺಈ࡞֬ೝ༻ ͷ؀ڥ͕ෆཁ 7JTVBM5FTU΍ͬͯΈͯ

wΫϩεϒϥ΢βରԠ wTUPSZCPPLͷTDSFFOTIPU͸QVQQFUFFS w༗ྉαʔϏε΋ݕ౼ ͜Ε͔ΒͷվળϙΠϯτ

6TFS*OUFSBDUJPO ʹର͢Δςετίʔυ

6TFS*OUFSBDUJPO 7VFY "DUJPO &WFOU )5.- $44 $PNQPOFOU 6TFS *OUFSBDUJPO

wϑΥʔϜೖྗ wϘλϯΫϦοΫ wεΫϩʔϧ w%% wεϫΠϓ wϐϯνΠϯɺΞ΢τ wFUD 6TFS*OUFSBDUJPOͱ͸

wϑΥʔϜೖྗ wϘλϯΫϦοΫ wεΫϩʔϧ w%% wεϫΠϓ wϐϯνΠϯɺΞ΢τ wFUD 6TFS*OUFSBDUJPOͱ͸ ςετ೉қ౓௿ ςετ೉қ౓ߴ
ͬͪ͜ͷΈΛςετ͍ͯ͠Δ

࣮૷ྫ 6TFS*OUFSBDUJPO <template> <div> <h1>৽ن࡞੒</h1> <form class="form" novalidate > <div
class="form-item"> <label for="title">λΠτϧ</label> <input type=“text" id="title" name="title" v-model="post.title" v-validate="'required'"> <span v-show=“errors.has('title')"> {{ errors.first('title') }} </span> </div> <div class="form-item"> <label for="body">಺༰</label> <input type=“text" id="body" name="body" v-model="post.body" v-validate="'required'"> <span v-show="errors.has('body')">{{ errors.first('body') }}</span> </div> <button type="button" id=“create-button" @click="save">อଘ</button> </form> </div> </template> JOQVUUFYUY #VUUPOY γϯϓϧͳGPSN

࣮૷ྫ 6TFS*OUFSBDUJPO <template> <div> <h1>৽ن࡞੒</h1> <form class="form" novalidate > <div
class="form-item"> <label for="title">λΠτϧ</label> <input id="title" name="title" v-model="post.title" type=“text" v-validate="'required'"> <span v-show=“errors.has('title')"> {{ errors.first('title') }} </span> </div> <div class="form-item"> <label for="body">಺༰</label> <input id="body" name="body" v-model="post.body" type=“text" v-validate="'required'"> <span v-show="errors.has('body')">{{ errors.first('body') }}</span> </div> <button id="create-button" type="button" @click="save">อଘ</button> </form> </div> </template> WFFWBMJEBUF ͰඞਢνΣοΫ

࣮૷ྫ 6TFS*OUFSBDUJPO export default { data: () => ({ post:
{ title: '', body: '' } }), methods: { async save () { const isValid = await this.$validator.validate() if (isValid) { await this.$store.dispatch( 'createPost', { post: this.post } ) this.$router.push({ path: '/' }) } } } } WBMJEBUFͯ͠ BDUJPOEJTQBUDI

ςετྫ XSBQQFS४උ // ϩʔΧϧͳVueίϯετϥΫλʹVuex/VeeValidateΛΠϯετʔϧ const localVue = createLocalVue() localVue.use(Vuex) localVue.use(VeeValidate)
beforeEach(() => { // Vue RouterͷϞοΫઃఆ $router = { push: sinon.stub() } // createPostΞΫγϣϯͷಈ࡞֬ೝͷͨΊͷVuexपΓͷઃఆ actions = { createPost: sinon.stub() } store = new Vuex.Store({ actions }) wrapper = mount(NewPost, { mocks: { $router }, store, localVue, sync: false }) }) TUPSFͷϞοΫΛ ࡞੒NPVOU

ςετྫ ೖྗͯ͠DMJDLͨ͠ͱ͖ describe('ೖྗͯ͠อଘϘλϯΛclickͨ͠ͱ͖', () => { beforeEach(async () => {
wrapper.find('#title').setValue('title') wrapper.find('#body').setValue('body') wrapper.find('#create-button').trigger('click') await flushPromises() }) it('ೖྗ͞Εͨ಺༰Ͱaction͕dispatch͞ΕΔ͜ͱ', () => { sinon.assert.calledWithMatch(actions.createPost, {}, { post: { title: 'title', body: 'body' } }) }) }) ೖྗޙʹϘλϯDMJDLͷͱ͖ EJTQBUDI͞ΕΔ

ςετྫ ೖྗͤͣʹDMJDLͨ͠ͱ͖ describe('ະೖྗͰอଘϘλϯΛclickͨ͠ͱ͖', () => { beforeEach(async () => {
wrapper.find('#create-button').trigger('click') await flushPromises() }) it('validationΤϥʔ͕දࣔ͞ΕΔ͜ͱ', () => { expect(wrapper.text()).to.contain( 'The title field is required.') }) it('action͕dispatch͞Εͳ͍͜ͱ', () => { sinon.assert.notCalled(actions.createPost) }) }) ະೖྗͰϘλϯDMJDLͷͱ͖ WBMJEBUJPOΤϥʔදࣔEJTQBUDI͞Εͳ͍

ςετྫ ೖྗͤͣʹDMJDLͨ͠ͱ͖ describe('ະೖྗͰอଘϘλϯΛclickͨ͠ͱ͖', () => { beforeEach(async () => {
wrapper.find('#create-button').trigger('click') await flushPromises() }) it('validationΤϥʔ͕දࣔ͞ΕΔ͜ͱ', () => { expect(wrapper.text()).to.contain( 'The title field is required.') }) it('action͕dispatch͞Εͳ͍͜ͱ', () => { sinon.assert.notCalled(actions.createPost) }) }) ද͕ࣔมΘͬͨ෦෼Λ ୯७ͳBTTFSUͯ͠Δ

wྫ͑͹  WBMJEBUJPOΤϥʔৄࡉΛ։͘ด͡Δ  Ϙλϯԡͯ͠Ϟʔμϧ։͘FUD wཁ͸ςετͷதͰɺTOBQTIPUΛࡱΓ͍ͨ 6TFS*OUFSBDUJPOޙͷը૾ΛࡱΓ͍ͨ wrapper.find('#create-button').trigger('click') screenshot(‘ະೖྗͰͷclickޙ.png’)

+FTU $PWFSBHF 4JOPO $IBJQPXFSBTTFSU *TUBOCVM $PNQPOFOU 5FTU6UJMJUZ 7VF5FTU6UJMT ͜Εͩͱ Մೳ

wLBSNBOJHIUNBSF wLBSNBͰOJHIUNBSF FMFDUSPO ্ͰςετΛ ࣮ߦͰ͖Δ΋ͷ wTDSFFOTIPU"1*Λఏڙͯ͘͠ΕΔ wը૾͕ࡱΕͨΒTUPSZCPPLͷը૾ͱҰॹʹ SFHTVJUͷϑϩʔʹࡌͤΔ 5FTUதʹTDSFFOTIPUࡱΔʹ͸

w؆୯ͳ6TFS*OUFSBDUJPOͷςετ͸େม͡Όͳ͍ wॏཁͳ'PSN͚ͩͰ΋΍͓ͬͯ͘ͱ͍͍ wͦΕҎ֎͸ఘΊ΋؊৺ w6TFS*OUFSBDUJPOޙͷTDSFFOTIPUͱͬͯɺ7JTVBM 5FTU͸΍ͬͺΓศར 6TFS*OUFSBDUJPOͷςετͯ͠Έͯ

·ͱΊ

7VFY "DUJPO &WFOU )5.- $44 $PNQPOFOU -JGFDZDMF 7VFY 4UBUF 1SPQT
6TFS *OUFSBDUJPO ςετλʔήοτ

͜͜·Ͱ঺հ͖ͯͨ͠ ৭ʑͳςετΛ ݱ৔Ͱ͖ͯ͠·ͨ͠ ͦͷ݁ՌɺҰ൪࠷ߴͳςετ͸

)5.- $44 $PNQPOFOU 7VFY 4UBUF 1SPQT 6TFS *OUFSBDUJPO ͜ͷ෦෼ͷ7JTVBM5FTU

wTUPSZCPPLͰͷʮ1SPQT7VFY4UBUFˠදࣔʯ ͷςετ͚ͩͰ΋͋Δͱ҆৺ wʮ6TFS*OUFSBDUJPOˠදࣔʯͷςετ΋͋ Δͱߋʹ҆৺ͷ෯͕޿͕Δ w෭࡞༻ͱͯ͠ϨϏϡʔͷෛՙܰݮ w͜Ε͕ඇৗʹେ͖͍ 7JTVBM5FTU͸࠷ߴ

ָͰ͖Δͱ͜Ζ͸ָͯ͠ ෆ҆Λղফͭͭ͠ ָ͘͠։ൃ͍͖ͯ͠·͠ΐ͏

1年間単体テストを書き続けた現場から送る Vue Component のテスト / Vue Component Test

1年間単体テストを書き続けた現場から送る Vue Component のテスト / Vue Component Test

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