chore: import upstream snapshot with attribution

test/xml.test.ts

@@ -0,0 +1,65 @@
+import { describe, it, expect } from 'vitest'
+import { getXmlTag, getXmlChildren } from '../src/prompts/xml.js'
+
+describe('getXmlTag', () => {
+  it('extracts simple tag content', () => {
+    expect(getXmlTag('<title>Hello World</title>', 'title')).toBe('Hello World')
+  })
+
+  it('extracts multiline content', () => {
+    expect(getXmlTag('<narrative>\nLine 1\nLine 2\n</narrative>', 'narrative')).toBe('Line 1\nLine 2')
+  })
+
+  it('returns empty string for missing tag', () => {
+    expect(getXmlTag('<title>Hello</title>', 'missing')).toBe('')
+  })
+
+  it('returns first match for duplicate tags', () => {
+    expect(getXmlTag('<title>First</title><title>Second</title>', 'title')).toBe('First')
+  })
+
+  it('returns empty string for empty tag', () => {
+    expect(getXmlTag('<title></title>', 'title')).toBe('')
+  })
+
+  it('trims whitespace', () => {
+    expect(getXmlTag('<title>  trimmed  </title>', 'title')).toBe('trimmed')
+  })
+
+  it('returns empty for invalid tag names', () => {
+    expect(getXmlTag('<foo>bar</foo>', '.*')).toBe('')
+  })
+
+  it('returns empty for tag with special regex chars', () => {
+    expect(getXmlTag('<foo>bar</foo>', 'a(b')).toBe('')
+  })
+})
+
+describe('getXmlChildren', () => {
+  it('extracts child elements', () => {
+    const xml = '<facts><fact>One</fact><fact>Two</fact></facts>'
+    expect(getXmlChildren(xml, 'facts', 'fact')).toEqual(['One', 'Two'])
+  })
+
+  it('returns empty array for missing parent', () => {
+    expect(getXmlChildren('<foo>bar</foo>', 'facts', 'fact')).toEqual([])
+  })
+
+  it('returns empty array for missing children', () => {
+    expect(getXmlChildren('<facts></facts>', 'facts', 'fact')).toEqual([])
+  })
+
+  it('trims child content', () => {
+    const xml = '<facts><fact>  trimmed  </fact></facts>'
+    expect(getXmlChildren(xml, 'facts', 'fact')).toEqual(['trimmed'])
+  })
+
+  it('handles multiline children', () => {
+    const xml = '<decisions><decision>Use JWT\nfor auth</decision></decisions>'
+    expect(getXmlChildren(xml, 'decisions', 'decision')).toEqual(['Use JWT\nfor auth'])
+  })
+
+  it('returns empty for invalid parent tag name', () => {
+    expect(getXmlChildren('<facts><fact>A</fact></facts>', '.*', 'fact')).toEqual([])
+  })
+})