Custom Matchers for Range Validation

Build a custom Jest matcher library that provides intuitive assertions for testing numeric ranges and boundary conditions.

Capabilities

Range validation matcher

Provides a matcher to check if a number falls within a specified range (inclusive).

• Given the number 5, checking if it's in range [1, 10] returns true @test
• Given the number 0, checking if it's in range [1, 10] returns false @test
• Given the number 10, checking if it's in range [1, 10] returns true (inclusive upper bound) @test

Matcher provides helpful error messages

The custom matcher should provide clear, descriptive error messages when assertions fail.

• When a value is outside the expected range, the error message includes the received value and the expected range @test

Implementation

@generates

API

/**
 * Extends Jest's expect with custom matchers for range validation.
 * Must be called before using the custom matchers in tests.
 */
function setupCustomMatchers() {
  // Implementation registers custom matcher(s) with expect
}

module.exports = { setupCustomMatchers };

Dependencies { .dependencies }

jest { .dependency }

Provides the testing framework and expect.extend functionality for creating custom matchers.

@satisfied-by