testing-library/jest-dom

Features

• DOM Testing Utilities - Offers a comprehensive toolkit for validating the accessibility, visibility, and structural properties of web elements.
• DOM Matchers - Extends the Jest test runner with a comprehensive collection of specialized matchers for DOM state verification.
• DOM Presence Verifications - Provides matchers to assert whether an element exists in the DOM or within a specific container.
• Accessibility Testing - Evaluates software interfaces to ensure they meet accessibility standards and are readable by assistive technologies.
• DOM Content Assertions - Offers assertions to verify that elements contain specific text or HTML content.
• Element State Verifications - Provides matchers to check HTML attributes, CSS classes, and applied styles to confirm an element's structural state.
• Custom Matchers - Ships specialized matchers for asserting CSS classes, attributes, and form validity in JavaScript tests.
• Accessible Attribute Verifications - Provides specialized matchers to verify accessible names, roles, and descriptions for assistive technology compatibility.
• Accessibility Validation Utilities - Provides a suite of assertions for verifying ARIA roles and accessibility standards within the browser DOM.
• UI State Verifications - Validates that the UI has reached the expected state by checking element properties like focus, visibility, and disabled status.
• ARIA Attribute Validations - Implements assertions to ensure elements comply with WAI-ARIA standards for assistive technologies.
• Element Property Inspection - Enables programmatic inspection of DOM properties and attributes to verify the current state of web elements.
• Input State Verifications - Verifies internal states of form controls, including focus, validity, and user text selections.
• Form Validity Assertions - Checks whether a form element is currently valid, invalid, or marked as required.
• Form Value Assertions - Provides matchers to assert the values of individual form controls or entire fieldsets.
• DOM Hierarchy Navigators - Provides utilities to navigate the DOM hierarchy to verify parent-child relationships and element positioning.
• DOM Structure Verification - Ensures the generated HTML structure matches expected patterns and hierarchical relationships.
• Relative Positioning Verifications - Determines if an element appears before or after another specific element in the document hierarchy.
• Web Form Test Assertions - Provides matchers to check that input fields and form elements have correct values and validity states.
• Form Value Display Verifications - Verifies the actual value displayed to the end user for various supported form elements.
• Computed Style Analyzers - Analyzes resolved CSS values via the browser's computed style API to determine element visibility and layout.
• Test Matchers - DOM state testing matchers
• Testing and Quality Assurance - Custom matchers for testing the state of the DOM.

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