The AI Test Report Said 97.3% Coverage. The Client's Lead Engineer Asked One Question. The Room Went Silent.
Based on real QA scenarios. About what happens when AI-generated metrics replace real testing, and the quiet engineer in the back row has been running his own numbers the whole time. Act 1: The Review Meeting I was sitting at the back of the long table, a ThinkPad in front of me, screen dimmed. On the big screen, Zhang Lei was presenting the acceptance data for his "AI Automated Testing Platform." His delivery was smooth. Every slide was a beautiful chart — coverage trends, automation rate improvements, regression testing time curves. All three lines pointed up and to the right, exactly like the textbook ideal curves. "In the past three months, the AI testing platform has executed 47,000 test cases, achieving 97.3% functional coverage. Regression testing time has dropped from 12 hours to 2.1 hours." Sparse applause. Zhang Lei added the final slide: "Monthly savings: approximately 200 person-days in labor cost." General Manager Zhou nodded and started the applause. That number was what he cared about most. I glanced at the other end of the table — the client's representative from RuiJie Technology. Chief Engineer Shen. Early fifties, thinning on top, silver-rimmed glasses. He hadn't said a word through the entire presentation. Hands folded on the table, occasionally jotting notes in a small book. Zhang Lei opened the Q&A slide and looked around the room: "Any questions?" Chief Engineer Shen flipped through the printed materials in front of him, stopped at the appendix, and looked up. "Page 47, Table 3.2 — what's the confidence interval on that 97.3% coverage?" The room went silent for about 15 seconds. Not the kind of silence where people are thinking. The kind where nobody had ever thought about it. Zhang Lei stood by the projector, clicker still in his hand, paused for two seconds: "Uh... the model confidence is quite high. The specific number is in the technical report." "Which page?" "I'll need to look it up." Chief Engineer Shen didn't push further. He looked do