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Testing URL Path Construction Implementation in Axios

This test suite validates the buildFullPath helper function in Axios, which handles URL path combination logic. The tests ensure proper URL construction when combining base URLs with requested paths, covering both relative and absolute URL scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of URL path building functionality:

Combining base URLs with relative paths
Handling absolute URLs in requests
Processing undefined base URLs
Managing relative paths for both base and requested URLs

Implementation Analysis

The testing approach uses Jest’s describe/it pattern for clear test organization. Each test case isolates a specific URL combination scenario, using explicit expect statements with toBe matchers for precise assertions. The implementation demonstrates clean separation of test cases for different URL formatting scenarios.

Technical Details

Testing Framework Components:

Jest testing framework
Expect assertions with toBe matcher
Modular test structure with describe blocks
Direct function import for unit testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Isolated test cases for each URL scenario
Clear test descriptions that specify expected behavior
Consistent assertion patterns
Comprehensive edge case coverage
Focused unit testing of a single helper function

axios/axios

test/specs/core/buildFullPath.spec.js

            
import buildFullPath from '../../../lib/core/buildFullPath';

describe('helpers::buildFullPath', function () {
  it('should combine URLs when the requestedURL is relative', function () {
    expect(buildFullPath('https://api.github.com', '/users')).toBe('https://api.github.com/users');
  });

  it('should return the requestedURL when it is absolute', function () {
    expect(buildFullPath('https://api.github.com', 'https://api.example.com/users')).toBe('https://api.example.com/users');
  });

  it('should not combine URLs when the baseURL is not configured', function () {
    expect(buildFullPath(undefined, '/users')).toBe('/users');
  });

  it('should combine URLs when the baseURL and requestedURL are relative', function () {
    expect(buildFullPath('/api', '/users')).toBe('/api/users');
  });

});