Mounting Vue components in Cypress - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to mount a Vue component using Cypress.

Cypress

cy.[1](MyComponent)

Drag options to blanks, or click blank then click option'

Aclick

Brender

Cvisit

Dmount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'render' instead of 'mount' which is not a Cypress command.

Using 'visit' which is for visiting URLs, not mounting components.

The mount command is used in Cypress to mount Vue components for testing.

2fill in blank

medium

Complete the code to import the mount function from Cypress Vue testing library.

Cypress

import { [1] } from '@cypress/vue'

Drag options to blanks, or click blank then click option'

Aclick

Brender

Cmount

Dvisit

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'render' which is not provided by '@cypress/vue'.

Confusing with 'visit' which is unrelated to component mounting.

The mount function is imported from '@cypress/vue' to mount Vue components in tests.

3fill in blank

hard

Fix the error in the code to correctly mount a Vue component with props.

Cypress

cy.mount(MyComponent, { [1]: { title: 'Hello' } })

Drag options to blanks, or click blank then click option'

Aprops

BpropsData

Cdata

Dattributes

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'propsData' which is Vue Test Utils syntax, not Cypress Vue.

Using 'data' which is for component internal data, not props.

In Cypress Vue testing, props are passed using the props option, not 'propsData'.

4fill in blank

hard

Fill both blanks to mount a Vue component with global plugins and stubs.

Cypress

cy.mount(MyComponent, { global: { [1]: [router], [2]: { 'my-child': true } } })

Drag options to blanks, or click blank then click option'

Aplugins

Bcomponents

Cstubs

Ddirectives

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'components' instead of 'stubs' to replace child components.

Using 'directives' instead of 'plugins' for adding Vue plugins.

The plugins array is used to add Vue plugins like router, and stubs is used to replace child components during mounting.

5fill in blank

hard

Fill all three blanks to mount a Vue component with props, global components, and a directive.

Cypress

cy.mount(MyComponent, { [1]: { count: 5 }, global: { [2]: { Button }, [3]: { focus: focusDirective } } })

Drag options to blanks, or click blank then click option'

Aprops

Bcomponents

Cdirectives

Dstubs

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'stubs' with 'components' when registering global components.

Passing props under 'data' instead of 'props'.

Props are passed with props, global components registered under components, and directives under directives.

Practice

1. What is the main purpose of mounting a Vue component in Cypress tests?

easy

A. To deploy the component to production

B. To create a new Vue component from scratch

C. To write CSS styles for the component

D. To test the component in isolation without the full app

Solution

1. Step 1: Understand mounting in testing context

   Mounting means loading a component alone to test its behavior without other app parts.

2. Step 2: Identify the purpose of mounting in Cypress

   Cypress mounts Vue components to isolate and test them independently.

3. Final Answer:

   To test the component in isolation without the full app -> Option D

4. Quick Check:

   Mounting = isolated component test [OK]

Hint: Mount means test component alone, not full app [OK]

Common Mistakes:

• Confusing mounting with deployment
• Thinking mounting creates components
• Mixing mounting with styling

2. Which of the following is the correct syntax to mount a Vue component named MyButton in Cypress?

easy

A. cy.mount(MyButton)

B. mount.cy(MyButton)

C. cy.component(MyButton)

D. mountComponent(MyButton)

Solution

1. Step 1: Recall Cypress Vue mounting syntax

   The official Cypress command to mount Vue components is cy.mount().

2. Step 2: Check each option's syntax

   Only cy.mount(MyButton) matches the correct Cypress syntax.

3. Final Answer:

   cy.mount(MyButton) -> Option A

4. Quick Check:

   Correct mount syntax = cy.mount() [OK]

Hint: Use cy.mount() to mount Vue components in Cypress [OK]

Common Mistakes:

• Swapping method and object order
• Using non-existent commands like cy.component
• Confusing mount with other Cypress commands

3. Given this test code, what will the assertion check?

cy.mount(MyButton, { props: { label: 'Click me' } })
cy.get('button').should('contain.text', 'Click me')

medium

A. The button contains the text 'Click me'

B. The button is disabled

C. The button has no text

D. The button has a CSS class named 'Click me'

Solution

1. Step 1: Understand the mounted component props

   The component is mounted with a prop label set to 'Click me'.

2. Step 2: Analyze the assertion

   The test checks if the button element contains the text 'Click me'.

3. Final Answer:

   The button contains the text 'Click me' -> Option A

4. Quick Check:

   Prop label sets button text = 'Click me' [OK]

Hint: Props set text, assertion checks button text content [OK]

Common Mistakes:

• Confusing text content with CSS classes
• Assuming button is disabled without code
• Ignoring the prop passed to component

4. Identify the error in this Cypress test code for mounting a Vue component:

cy.mount(MyButton, { props: { label: Click me } })
cy.get('button').should('contain.text', 'Click me')

medium

A. The assertion uses wrong method should('text')

B. The prop value Click me is not quoted as a string

C. The selector 'button' is invalid

D. The mount command is missing parentheses

Solution

1. Step 1: Check prop syntax

   The prop value Click me is missing quotes, so it's treated as an undefined variable.

2. Step 2: Verify other parts

   Mount syntax and selector are correct; assertion method is valid.

3. Final Answer:

   The prop value Click me is not quoted as a string -> Option B

4. Quick Check:

   Prop strings must be quoted [OK]

Hint: Always quote string prop values in mount options [OK]

Common Mistakes:

• Forgetting quotes around string props
• Misusing assertion methods
• Using invalid selectors

5. You want to test a Vue component AlertBox that accepts a slot for custom message content. Which is the correct way to mount it with a slot containing <p>Warning!</p> in Cypress?

hard

A. cy.mount(AlertBox, { slot: 'Warning!' })

B. cy.mount(AlertBox, { props: { default: 'Warning!' } })

C. cy.mount(AlertBox, { slots: { default: 'Warning!' } })

D. cy.mount(AlertBox, { children: 'Warning!' })

Solution

1. Step 1: Understand slot passing in Cypress mount

   Slots are passed using the slots option with keys for slot names.

2. Step 2: Check each option

   Only cy.mount(AlertBox, { slots: { default: '

   Warning!

   ' } }) correctly uses slots: { default: '

   Warning!

   ' } syntax.

3. Final Answer:

   cy.mount(AlertBox, { slots: { default: '<p>Warning!</p>' } }) -> Option C

4. Quick Check:

   Slots passed via slots object [OK]

Hint: Use slots: { default: '<html>' } to pass slot content [OK]

Common Mistakes:

• Passing slot content as props
• Using wrong option names like slot or children
• Not wrapping slot content in slots object