chore: import upstream snapshot with attribution

apps/sim/lib/knowledge/documents/parser-extension.test.ts

@@ -0,0 +1,27 @@
+/**
+ * @vitest-environment node
+ */
+import { describe, expect, it } from 'vitest'
+import { resolveParserExtension } from '@/lib/knowledge/documents/parser-extension'
+
+describe('resolveParserExtension', () => {
+  it('uses a supported filename extension when present', () => {
+    expect(resolveParserExtension('report.pdf', 'application/pdf')).toBe('pdf')
+  })
+
+  it('falls back to mime type when filename has no extension', () => {
+    expect(
+      resolveParserExtension('[Business] Your Thursday morning trip with Uber', 'text/plain')
+    ).toBe('txt')
+  })
+
+  it('falls back to mime type when filename extension is unsupported', () => {
+    expect(resolveParserExtension('uber-message.business', 'text/plain')).toBe('txt')
+  })
+
+  it('throws when neither filename nor mime type resolves to a supported parser', () => {
+    expect(() =>
+      resolveParserExtension('uber-message.unknown', 'application/octet-stream')
+    ).toThrow('Unsupported file type')
+  })
+})