Module quiz: JSX and Testing :Advanced React (Meta Front-End Developer Professional Certificate) Answers 2025

✅ MCQ Answers

1. Features of component containment

✔️ A component that acts as a generic box.
✔️ The fact that some components don’t know their children ahead of time.
✔️ A component that uses the children prop to pass children elements directly as their content.
❌ A special case of other components.

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2. Props that all components have by default

✔️ children
❌ render
❌ type

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3. What is a React Element?

✔️ A JavaScript object that represents the final HTML output.
❌ A React Component that represents a simple DOM node, like a button.
✔️ An intermediary representation that describes a component instance.

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4. Features implemented from component composition with children

✔️ Component containment.
❌ Component specialization and containment.
❌ Component specialization.

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5. Use cases of React.cloneElement API

✔️ Modify children’s properties.
✔️ Add to children properties.
✔️ Extend the functionality of children components.

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6. What’s wrong in the Row implementation?

❌ Each child is missing a key
✔️ Each child is being mutated.
❌ You can’t use spread operator in style

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7. What will be logged when clicking Submit?

✔️ “WithClick”
❌ “AppClick”
❌ “ButtonClick”

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8. Valid solutions to encapsulate cross-cutting concerns

✔️ Components that consume context.
✔️ Render props pattern.
✔️ Higher order components.
✔️ Custom hooks.

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9. What does screen represent in react-testing-library?

❌ Your laptop screen
❌ The whole page or root document
✔️ The whole virtual DOM

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10. Jest matcher to assert a button is disabled

❌ toHaveBeenCalled
❌ toBeInTheDocument
✔️ toHaveAttribute

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📘 Summary Table

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