Vue Unit Testing #7 - Select component test

Summary

This script details the process of writing tests for a base select component in a web application. The tests aim to verify that the component contains a reset button, displays a placeholder when no option is selected, and correctly renders passed options. The approach involves using testing scenarios and the Mount function to render the component, followed by expectations to check the presence of the reset button, its icon, and button type. The process also includes handling warnings, updating snapshots, and ensuring robustness through test failures when unexpected changes occur.

Takeaways

• 😀 The script focuses on writing tests for a 'Base Select' component, specifically for its reset button functionality.
• 😀 The testing process begins by setting up a test file and importing necessary components like 'Base Select' and 'Base Button'.
• 😀 A testing scenario is written using the 'to-do' modifier to describe the tests before they are implemented, ensuring they are not forgotten.
• 😀 The first testing scenario checks that the 'Base Select' component contains a reset button.
• 😀 The script highlights the importance of passing required props to the component to eliminate warnings during tests.
• 😀 To verify the presence of the reset button, the test uses the 'findComponent' method to check if the 'Base Button' component is present.
• 😀 The test then checks the 'type' property of the 'Base Button' to ensure it has the correct value ('neutral').
• 😀 The 'Base Button' is expected to contain an 'x mark' icon, and the test verifies this by checking the 'name' property of the 'Base Icon' component.
• 😀 If any changes are made to the button's 'type' or icon, the test will fail, providing a safeguard against accidental changes.
• 😀 The process concludes with cleaning up the test file, removing extra print statements, and running all tests to ensure they pass after snapshot regeneration.

Q & A

What is the main objective of the test described in the script?

The main objective of the test is to verify the functionality and presence of various components in the Base Select component, such as the reset button, placeholder text, and options rendering.

How does the script suggest starting with the test file for the Base Select component?

The script suggests starting by creating a new test file for the Base Select component, removing all existing content except for the necessary imports, and then adding a description for the test scenarios.

What is the purpose of the 'to-do' modifier in the test?

The 'to-do' modifier is used to describe testing scenarios without specifying the test function immediately. It helps ensure that all planned tests are accounted for, even if their implementation is deferred.

What are the three main testing scenarios described in the script?

The three main testing scenarios described are: 1) Ensuring the Base Select component contains a reset button, 2) Checking if the placeholder text is displayed when no options are selected, and 3) Verifying that the options passed as props are rendered.

How does the script suggest testing the presence of the reset button?

The script suggests using the 'find component' method to check for the presence of a Base Button component within the Base Select component. The test verifies that the button has a 'neutral' type as a prop.

What issue is addressed by passing default values for the missing props in the Base Select component?

Passing default values for the missing props resolves the warnings that appear when the component is rendered without necessary props, ensuring that the test can run without interruptions.

Why does the script check the 'type' property of the Base Button component?

The script checks the 'type' property of the Base Button component to ensure it has the correct value (neutral) for the reset button, guaranteeing that the button's appearance matches the expected design.

What additional verification does the script include for the reset button, aside from its type?

In addition to checking the 'type' property, the script also verifies that the Base Button component has the correct icon, specifically an 'x mark' icon, by checking the 'name' property of the Base Icon component.

What happens if the icon for the reset button is changed or removed?

If the icon for the reset button is changed or removed, the test will fail, providing assurance that the icon has not been accidentally altered.

What is the final step after all tests are written and run in the script?

The final step involves removing any unnecessary print statements, using the 'to-do' modifier to mark completed scenarios, regenerating obsolete snapshots, and then running all tests to ensure they pass.