> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vistrowvoice.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Testing Lab

> Stress-test an agent with realistic callers before your customers do.

[Test your agent in the Testing Lab · 1:34](https://www.youtube-nocookie.com/embed/8znDT_uFJfA?rel=0)

Test your agent in the Testing Lab · 1:34

The **Testing Lab** runs a live conversation with your agent's real configuration in the browser — you play the caller.

**1. Choose a caller situation**

Pick one of the ready-made situations: Impatient customer, Angry customer, Silent caller, Frequent interruptions, Hindi-English switching, Multiple language changes, Noisy background, Unsupported question, Booking conflict, CRM or API failure, Transfer unavailable or Voicemail.

**2. Pick the agent under test**

Choose the agent under **Agent under test**, then read the **Caller instructions** and the list of what **The agent should** do.

**3. Start a live test**

Click **Start live test** and play the caller using your microphone.

**4. Read the result**

**Latest test result** checks opening quality, response length, empathy, one question at a time, repeated responses, tool accuracy, first response latency and estimated cost. Amber items need a look; some checks stay as review items until you read the transcript. Click **Open transcript and diagnostics** to read the conversation turn by turn.

## Re-run tests after every change

Use **Custom regression** to save your own scenario — what the tester should say and the behaviours you expect, one per line — and run it again after every prompt change. **Save as regression** saves the selected situation the same way.

> [!TIP]
>
> For a quick check without a scenario, every agent card on the **Agents** page has a **Browser test** button (your microphone) and a **Call test** button (a real phone call).


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