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

# Code Simulations

> Simulate and validate test scenarios through AI-powered predictions before running actual tests, helping teams identify risks, refine strategies, and strengthen coverage.

## What Are Code Simulations?

Code Simulations allow you to describe test scenarios in natural language and have AI simulate what would happen before you run actual tests.  This **"testing before testing"** approach helps you:

* Identify potential issues early
* Assess risk before execution
* Validate testing strategies
* Uncover edge cases through AI-driven analysis

***

## Scenario Creation

Build structured scenarios with the following components:

<AccordionGroup>
  <Accordion title="Title & Description">
    * Create named scenarios for specific testing situations.
    * Provide a clear description of what you're trying to validate or test.
  </Accordion>

  <Accordion title="Initial State">
    * Define starting conditions for the test, including:
      * Required setup or seed data
      * User permissions and access levels
      * System configurations needed before testing begins
  </Accordion>

  <Accordion title="Interventions">
    * Outline step-by-step actions for the scenario, such as:
      * User interactions or system events
      * Optional hints for each step to guide execution
      * Indicators for what to watch for or measure
  </Accordion>

  <Accordion title="Expected Outcome">
    * Define what success looks like:
      * Specific behaviors or UI states
      * Data changes or persistence results
      * Final system state validation
  </Accordion>

  <Accordion title="Source Integration">
    * Automatically generate scenarios from:
      * Existing tickets
      * Historical issues and known regressions
      * Relevant user reports tied to your codebase
  </Accordion>
</AccordionGroup>

```
Scenario Title: [Name]

Initial State:
[Describe starting conditions, data, or setup required]

Interventions:
Step 1: [User action] (Hint: [Optional guidance])
Step 2: [System interaction] (Hint: [What to watch for])
Step 3: [Expected behavior]

Expected Outcome:
[Describe the final result, state, or behavior expected]
```

## Simulation and Analysis

Run scenarios through AI-powered simulation — no actual code execution required.

<AccordionGroup>
  <Accordion title="AI-Powered Execution">
    * The AI processes each step in your scenario.
    * Predictions are based on:
      * Your codebase
      * Historical failure patterns
      * Known dependencies and system behavior
    * Simulations run against your organization's configured **release branch** by default. You can select a different branch when launching a simulation.
  </Accordion>

  <Accordion title="Status Tracking">
    * Monitor simulations in real time.
    * Scenarios progress through states:
      * Pending → Running → Finished or Canceled
    * Includes progress indicators and status logs.
  </Accordion>

  <Accordion title="State Analysis">
    * View intermediate states as the AI “walks through” each intervention.
    * Understand the assumptions, data transitions, and expected results at every stage.
  </Accordion>

  <Accordion title="Risk Assessment">
    * The AI assigns a likelihood of success:
      * Unlikely
      * Uncertain
      * Very Likely
    * Ratings are based on historical outcomes and risk signals in your code.
  </Accordion>

  <Accordion title="Prediction vs Reality">
    * Compare the AI’s predicted results with your expected outcomes.
    * Get explanations for any gaps to refine your assumptions.
    * Surface potential edge cases or untested paths before you commit to actual testing.
  </Accordion>
</AccordionGroup>

***

## Managing Scenarios

<AccordionGroup>
  <Accordion title="Inline Editing">
    * Edit scenarios directly from the side panel or the branch review page
    * Use the keyboard-driven step editor: **Enter** to add a new step, **Backspace** on an empty step to delete it
    * Quick-add scenarios to playlists without leaving the current view
  </Accordion>

  <Accordion title="Outdated Scenario Detection">
    * When a scenario definition has changed since the last simulation run, a warning banner appears on the simulation results
    * The warning shows which version was used and offers a one-click **re-run on the latest version**
    * Playlist views mark individual scenarios as outdated when their version has drifted
  </Accordion>

  <Accordion title="Re-running Simulations">
    * **Single-scenario re-run** — Re-run an individual simulation from the sim results viewer or playlist interface without re-running the entire playlist
    * **Branch re-run** — Trigger simulation runs on-demand from the branch review page using the **Run Simulations** button. Staleness detection warns when scenarios have changed since the last run.
  </Accordion>
</AccordionGroup>

## Use Cases

<AccordionGroup>
  <Accordion title="UI Testing">
    * Simulate user interactions and complex flows.
    * Validate responsive design, navigation, and form submissions without running full UI tests.
  </Accordion>

  <Accordion title="Backend Testing">
    * Model API calls and service interactions.
    * Analyze data validation, error handling, and integration points.
  </Accordion>

  <Accordion title="Database Interactions">
    * Predict data persistence, transaction handling, and load behavior.
    * Evaluate integrity checks and potential performance bottlenecks before load testing.
  </Accordion>
</AccordionGroup>

## Why It Matters

Code Simulations transform testing by providing **intelligent pre-analysis**, allowing teams to:

* Refine test scenarios before committing time to execution
* Identify risks and weak points early
* Build more comprehensive and resilient test coverage
* Reduce wasted time on redundant or low-value test cases

## Get Started

👉 [Setup guide](/developer-guide/quickstart-guide)