Can AI Test Itself? — From Claude Code's Zero Tests to Self-Testing Agents

Claude Code: 512K lines of TypeScript, 64K lines of production code, zero tests. But the more interesting question isn't why Anthropic skipped tests — it's why they didn't use their own AI coding tool to write them. Static analysis, MITM proxies, cross-model testing, and the philosophical trap of asking the same brain to write the exam and grade it.