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+---
+description: Get expert guidance on testing XState v5 actors with xstate-audition
+argument-hint: '[what-to-test]'
+---
+
+# XState Audition Testing Guidance
+
+Provide expert guidance on testing XState v5 actors using the xstate-audition library for comprehensive state machine and actor testing.
+
+## Usage
+
+```bash
+/audition [optional: what you need to test]
+```
+
+**Arguments:**
+
+- `what-to-test` (optional): Describe what you're trying to test or paste test code you need help with
+
+## Instructions
+
+When this command is invoked:
+
+1. **Load the xstate-audition skill** from `skills/xstate-audition/SKILL.md`
+
+2. **If the user provided context**, analyze their needs and:
+   - Identify which xstate-audition functions apply to their testing scenario
+   - Provide specific test examples using xstate-audition APIs
+   - Explain the testing pattern and timing considerations
+   - Show best practices for the specific test case
+   - Reference the appropriate documentation from `references/`:
+     - Core Functions for API documentation
+     - Options & Types for configuration details
+     - Testing Patterns for advanced examples
+
+3. **If no context was provided**, offer to help by:
+   - Asking what they're trying to test or what actor behavior needs verification
+   - Listing common test scenarios:
+     - Testing state transitions
+     - Testing promise actors and async operations
+     - Testing event emissions and actor communication
+     - Testing hierarchical actors and spawning
+     - Testing with timeouts and error handling
+     - Integration testing of actor systems
+   - Offering to show examples of specific patterns
+
+4. **Always emphasize xstate-audition best practices**:
+   - Use currying for repeated patterns to reduce boilerplate
+   - Set external input BEFORE awaiting (avoid race conditions)
+   - Use `waitFor*()` for multi-stage tests (keeps actor alive)
+   - Provide explicit type arguments (especially for `runUntilSpawn`)
+   - Use appropriate timeouts (less than test framework timeout)
+   - Test state transitions explicitly with `runUntilTransition()`
+   - Use `runUntilSnapshot()` for complex conditions
+
+5. **Explain the core testing pattern**:
+   1. Create an Actor using `createActor(logic)`
+   2. Create a Promise using a condition function (e.g., `runUntilDone(actor)`)
+   3. If the actor needs external input, perform that operation BEFORE awaiting
+   4. Await the Promise
+   5. Make assertions about the result
+
+6. **Clarify `runUntil*()` vs `waitFor*()`**:
+   - `runUntil*()` - Starts actor, waits for condition, then STOPS the actor
+   - `waitFor*()` - Starts actor, waits for condition, but KEEPS the actor running
+
+## Example Interactions
+
+**With context - testing a promise actor:**
+
+```text
+User: /audition How do I test this promise actor?
+const fetchLogic = fromPromise(async ({ input }) => {
+  const res = await fetch(input.url);
+  return res.json();
+});
+
+Agent: Here's how to test your promise actor with xstate-audition:
+
+\`\`\`typescript
+import { createActor, fromPromise } from 'xstate';
+import { runUntilDone } from 'xstate-audition';
+import { describe, it } from 'node:test';
+import { strict as assert } from 'node:assert';
+
+const fetchLogic = fromPromise<any, { url: string }>(
+  async ({ input }) => {
+    const res = await fetch(input.url);
+    return res.json();
+  }
+);
+
+describe('fetchLogic', () => {
+  it('should complete with fetched data', async () => {
+    const actor = createActor(fetchLogic, {
+      input: { url: 'https://api.example.com/data' }
+    });
+
+    const result = await runUntilDone(actor);
+
+    assert.ok(result);
+    assert.equal(typeof result, 'object');
+  });
+
+  it('should handle errors', async () => {
+    const actor = createActor(fetchLogic, {
+      input: { url: 'https://invalid.url' }
+    });
+
+    await assert.rejects(
+      runUntilDone(actor),
+      (err: Error) => {
+        assert.ok(err.message.includes('fetch'));
+        return true;
+      }
+    );
+  });
+});
+\`\`\`
+
+Key patterns:
+- `runUntilDone()` waits for the promise actor to complete
+- Pass input via actor options
+- Use `assert.rejects()` to test error cases
+- The actor automatically starts when you await the promise
+```
+
+**With context - testing state transitions:**
+
+```text
+User: /audition I need to test that my machine transitions from idle to loading when FETCH is sent
+
+Agent: Use `runUntilTransition()` to test explicit state changes:
+
+\`\`\`typescript
+import { createActor } from 'xstate';
+import { runUntilTransition } from 'xstate-audition';
+import { describe, it, beforeEach } from 'node:test';
+import { strict as assert } from 'node:assert';
+
+describe('fetchMachine transitions', () => {
+  let actor: Actor<typeof fetchMachine>;
+  let runFromIdle: CurryTransitionP2<typeof actor>;
+
+  beforeEach(() => {
+    actor = createActor(fetchMachine);
+    // Curry with actor and fromState for reusability
+    runFromIdle = runUntilTransition(actor, 'fetchMachine.idle');
+  });
+
+  it('should transition from idle to loading', async () => {
+    // Setup the promise FIRST
+    const promise = runFromIdle('fetchMachine.loading');
+
+    // THEN send the event that triggers the transition
+    actor.send({ type: 'FETCH' });
+
+    // Finally await the result
+    await promise;
+  });
+
+  it('should transition through loading to success', async () => {
+    actor.send({ type: 'FETCH' });
+    await runFromIdle('fetchMachine.success');
+  });
+});
+\`\`\`
+
+Important timing note:
+1. Create the promise BEFORE sending the event
+2. Send the event that triggers the transition
+3. Then await the promise
+
+This pattern avoids race conditions. The curried form (`runFromIdle`) reduces boilerplate!
+```
+
+**With context - testing event emissions:**
+
+```text
+User: /audition How do I test that my machine emits events?
+
+Agent: Use `runUntilEmitted()` to test event emissions:
+
+\`\`\`typescript
+import { createActor, setup, emit } from 'xstate';
+import { runUntilEmitted } from 'xstate-audition';
+import { describe, it } from 'node:test';
+import { strict as assert } from 'node:assert';
+
+const notifierMachine = setup({
+  types: {
+    emitted: {} as
+      | { type: 'READY'; message: string }
+      | { type: 'ERROR'; error: Error },
+  },
+}).createMachine({
+  initial: 'initializing',
+  states: {
+    initializing: {
+      entry: emit({ type: 'READY', message: 'System initialized' }),
+      on: {
+        START: 'running',
+      },
+    },
+    running: {},
+  },
+});
+
+describe('notifierMachine emissions', () => {
+  it('should emit READY on initialization', async () => {
+    const actor = createActor(notifierMachine);
+
+    // Wait for READY event
+    const [readyEvent] = await runUntilEmitted(actor, ['READY']);
+
+    assert.equal(readyEvent.type, 'READY');
+    assert.equal(readyEvent.message, 'System initialized');
+  });
+
+  it('should emit multiple events', async () => {
+    const actor = createActor(notifierMachine);
+
+    // Wait for any of these events
+    const events = await runUntilEmitted(actor, ['READY', 'ERROR']);
+
+    assert.ok(events.length > 0);
+    assert.equal(events[0].type, 'READY');
+  });
+});
+\`\`\`
+
+The function returns an array of emitted events. Test the ones you care about!
+```
+
+**With context - testing hierarchical actors:**
+
+```text
+User: /audition How do I test parent/child actor communication?
+
+Agent: Use `waitForSpawn()` to test hierarchical actors:
+
+\`\`\`typescript
+import { createActor } from 'xstate';
+import { waitForSpawn, waitForSnapshot } from 'xstate-audition';
+import { describe, it } from 'node:test';
+import { strict as assert } from 'node:assert';
+
+describe('parent-child communication', () => {
+  it('should spawn child and communicate', async () => {
+    const parent = createActor(parentMachine);
+
+    // Wait for child to spawn (parent stays running)
+    const child = await waitForSpawn<typeof childLogic>(
+      parent,
+      'childActor'
+    );
+
+    assert.ok(child);
+    assert.equal(child.id, 'childActor');
+
+    // Send event to child
+    child.send({ type: 'CHILD_EVENT' });
+
+    // Wait for parent to react to child's output
+    const parentSnapshot = await waitForSnapshot(
+      parent,
+      (snapshot) => snapshot.matches('parentReacted')
+    );
+
+    assert.ok(parentSnapshot.matches('parentReacted'));
+  });
+});
+\`\`\`
+
+Key points:
+- Use `waitForSpawn()` not `runUntilSpawn()` to keep parent running
+- Provide type argument `<typeof childLogic>` for proper typing
+- Parent stays alive so you can continue testing interactions
+```
+
+**Without context:**
+
+```text
+User: /audition
+
+Agent: I can help you test XState v5 actors with xstate-audition! What do you need to test?
+
+Common testing scenarios:
+- **State transitions** - Test explicit state changes with `runUntilTransition()`
+- **Promise actors** - Test async operations with `runUntilDone()`
+- **Event emissions** - Test emitted events with `runUntilEmitted()`
+- **Actor spawning** - Test child actors with `runUntilSpawn()` / `waitForSpawn()`
+- **Complex conditions** - Test multiple conditions with `runUntilSnapshot()`
+- **Event communication** - Test inter-actor events with `runUntilEventReceived()`
+- **Timeout handling** - Test with custom timeouts using `*With()` functions
+- **Integration tests** - Test complete actor systems with `waitFor*()` functions
+
+You can also:
+- Paste your existing test code for review
+- Ask about specific xstate-audition functions
+- Request help debugging timeout issues
+- Learn about currying patterns for cleaner tests
+
+Core testing pattern:
+1. Create actor with `createActor(logic)`
+2. Create promise with condition (e.g., `runUntilDone(actor)`)
+3. If actor needs input, send events BEFORE awaiting
+4. Await the promise
+5. Make assertions
+
+Key distinction:
+- `runUntil*()` - stops actor after condition
+- `waitFor*()` - keeps actor running
+
+What would you like to test?
+```
+
+## Related Files
+
+- [XState Audition Skill](../skills/xstate-audition/SKILL.md)
+- [Core Functions Reference](../skills/xstate-audition/references/core-functions.md)
+- [Options & Types Reference](../skills/xstate-audition/references/options-types.md)
+- [Testing Patterns Reference](../skills/xstate-audition/references/testing-patterns.md)