Testing Vue Props with TypeScript

Props are fundamental to component communication in Vue.js, allowing parent components to pass data down to their children. This challenge focuses on writing robust unit tests for Vue components that utilize props, ensuring that your components behave as expected when receiving different prop values. This is crucial for maintaining component stability and preventing unexpected behavior.

Problem Description

You are tasked with creating unit tests for a Vue component called UserCard. The UserCard component accepts three props: name (string), age (number), and isActive (boolean). The component displays the user's name, age, and a status message based on the isActive prop.

What needs to be achieved:

• Write unit tests using a testing framework of your choice (e.g., Vitest, Jest) to verify that the UserCard component renders correctly with different combinations of prop values.
• Ensure that the tests cover various scenarios, including valid and invalid prop values, and edge cases.
• The tests should assert that the component displays the correct name, age, and status message based on the provided props.

Key Requirements:

• Use TypeScript for both the component and the tests.
• The tests should be well-structured and easy to understand.
• The tests should cover both positive and negative scenarios.
• The tests should be isolated and not rely on external dependencies.

Expected Behavior:

• When isActive is true, the component should display "Active User".
• When isActive is false, the component should display "Inactive User".
• The component should display the provided name and age values correctly.
• If any prop is missing or invalid, the component should render gracefully (e.g., display a default value or an error message – the specific behavior is up to you, but the test should verify it).

Edge Cases to Consider:

• Empty or null name prop.
• Negative or zero age prop.
• isActive prop with a value other than true or false.
• Props not being passed at all.

Examples

Example 1:

Input: name="John Doe", age=30, isActive=true
Output: Displays "John Doe", "30", and "Active User"
Explanation: A standard, valid input should render the component with the provided values.

Example 2:

Input: name="", age=25, isActive=false
Output: Displays an empty string for the name, "25", and "Inactive User"
Explanation: An empty name should be handled gracefully, displaying an empty string.

Example 3:

Input: name="Jane Doe", age=-5, isActive=true
Output: Displays "Jane Doe", a default age (e.g., 0), and "Active User"
Explanation: A negative age should be handled gracefully, potentially defaulting to 0.

Constraints

• The component and tests must be written in TypeScript.
• You are free to choose your preferred testing framework (Vitest, Jest, etc.).
• The tests should be reasonably performant; avoid unnecessary complexity.
• The component code is not provided; you must create it alongside the tests. Assume a basic Vue 3 setup with TypeScript.

Notes

• Consider using a shallow mounting approach for your tests to isolate the component and avoid testing its children.
• Think about how to handle invalid prop values gracefully within the component itself. The tests should verify this handling.
• Focus on testing the output of the component based on the input props.
• Remember to use assertions to verify that the component renders the expected content.