Support for the PHPUnit dialect of JUnit

Refactor PHPUnit support into separate phpunit-junit parser

Instead of modifying the Java JUnit parser, this creates a dedicated
PHPUnit parser that properly handles PHPUnit's nested testsuite elements.
This keeps the parsers cleanly separated and allows for future PHPUnit-
specific features.

Co-Authored-By: Matteo Beccati <matteo@beccati.com>
Co-Authored-By: Claude Code <noreply@anthropic.com>

__tests__/phpunit-junit.test.ts

@@ -0,0 +1,102 @@
+import * as fs from 'fs'
+import * as path from 'path'
+
+import {PhpunitJunitParser} from '../src/parsers/phpunit-junit/phpunit-junit-parser'
+import {ParseOptions} from '../src/test-parser'
+import {getReport} from '../src/report/get-report'
+import {normalizeFilePath} from '../src/utils/path-utils'
+
+describe('phpunit-junit tests', () => {
+  it('produces empty test run result when there are no test cases', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'empty', 'phpunit-empty.xml')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PhpunitJunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+    expect(result.tests).toBe(0)
+    expect(result.result).toBe('success')
+  })
+
+  it('report from phpunit test results matches snapshot', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'phpunit', 'phpunit.xml')
+    const outputPath = path.join(__dirname, '__outputs__', 'phpunit-test-results.md')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PhpunitJunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+    expect(result).toMatchSnapshot()
+
+    const report = getReport([result])
+    fs.mkdirSync(path.dirname(outputPath), {recursive: true})
+    fs.writeFileSync(outputPath, report)
+  })
+
+  it('parses nested test suites correctly', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'phpunit', 'phpunit.xml')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PhpunitJunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+
+    // Should have 4 test suites (3 nested ones plus the parent with direct testcases)
+    expect(result.suites.length).toBe(4)
+
+    // Verify suite names
+    const suiteNames = result.suites.map(s => s.name)
+    expect(suiteNames).toContain('PHPUnit\\Event\\CollectingDispatcherTest')
+    expect(suiteNames).toContain('PHPUnit\\Event\\DeferringDispatcherTest')
+    expect(suiteNames).toContain('PHPUnit\\Event\\DirectDispatcherTest')
+    expect(suiteNames).toContain('CLI Arguments')
+
+    // Verify total test count
+    expect(result.tests).toBe(12)
+    expect(result.passed).toBe(10)
+    expect(result.failed).toBe(2)
+  })
+
+  it('extracts error details from failures', async () => {
+    const fixturePath = path.join(__dirname, 'fixtures', 'phpunit', 'phpunit.xml')
+    const filePath = normalizeFilePath(path.relative(__dirname, fixturePath))
+    const fileContent = fs.readFileSync(fixturePath, {encoding: 'utf8'})
+
+    const opts: ParseOptions = {
+      parseErrors: true,
+      trackedFiles: []
+    }
+
+    const parser = new PhpunitJunitParser(opts)
+    const result = await parser.parse(filePath, fileContent)
+
+    // Find the CLI Arguments suite which has failures
+    const cliSuite = result.suites.find(s => s.name === 'CLI Arguments')
+    expect(cliSuite).toBeDefined()
+
+    // Get the failed tests
+    const failedTests = cliSuite!.groups.flatMap(g => g.tests).filter(t => t.result === 'failed')
+    expect(failedTests.length).toBe(2)
+
+    // Verify error details are captured
+    for (const test of failedTests) {
+      expect(test.error).toBeDefined()
+      expect(test.error!.details).toContain('Failed asserting that string matches format description')
+    }
+  })
+})