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Testing SVG URL Parsing Implementation in Parcel Bundler

This test suite validates the parseFuncIRI function’s ability to handle URL parsing in SVG transformations within Parcel bundler. It focuses on testing both quoted and unquoted URL formats, ensuring robust handling of various edge cases and special characters.

Test Coverage Overview

The test suite provides comprehensive coverage of URL parsing scenarios in SVG processing:

Unquoted URL parsing with escape sequences
Quoted URL parsing with both single and double quotes
Edge cases including whitespace, newlines, and escaped characters
Invalid URL format detection and handling

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for structured test organization. Each test case employs assert.deepEqual for precise comparison of parsed results, focusing on:

Input validation and sanitization
Escape sequence handling
Quote matching and validation
Error case identification

Technical Details

Testing infrastructure includes:

Jest testing framework
Node.js assert module for assertions
Custom parseFuncIRI function from SVG transformer module
Unit test isolation for dependency management

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Systematic test case organization
Comprehensive edge case coverage
Clear test descriptions
Consistent assertion patterns
Proper separation of test scenarios

parcel-bundler/parcel

packages/transformers/svg/test/parseFuncIRI.test.js

            
import {parseFuncIRI} from '../src/dependencies';
import assert from 'assert';

describe('parseFuncIRI', () => {
  it('should parse unquoted url()', () => {
    assert.deepEqual(parseFuncIRI('url(test)'), ['test', '']);
    assert.deepEqual(parseFuncIRI('url(test hi)'), null);
    assert.deepEqual(parseFuncIRI('url(test"hi)'), null);
    assert.deepEqual(parseFuncIRI('url(test\\ hi)'), ['test hi', '']);
    assert.deepEqual(parseFuncIRI('url(test\\"hi)'), ['test"hi', '']);
    assert.deepEqual(parseFuncIRI('url(test\nhi)'), null);
    assert.deepEqual(parseFuncIRI('url(test\\\nhi)'), ['test\nhi', '']);
  });

  it('should parse quoted url()', () => {
    assert.deepEqual(parseFuncIRI('url("test")'), ['test', '']);
    assert.deepEqual(parseFuncIRI("url('test')"), ['test', '']);
    assert.deepEqual(parseFuncIRI('url(\'test")'), null);
    assert.deepEqual(parseFuncIRI('url("test\')'), null);
    assert.deepEqual(parseFuncIRI('url("test)'), null);
    assert.deepEqual(parseFuncIRI('url("test" hi)'), ['test', ' hi']);
    assert.deepEqual(parseFuncIRI('url("te\\"st" hi)'), ['te"st', ' hi']);
  });
});