Function registerAsync

registerAsync(
    testClassName: string,
    testName: string,
    testFunction: (arg0: Test) => Promise<void>,
): RegistrationBuilder
Parameters
- testClassName: string
  Name of the class of tests this test should be a part of.
- testName: string
  Name of this specific test.
- testFunction: (arg0: Test) => Promise<void>
  Implementation of the test function.
Returns RegistrationBuilder
Returns a RegistrationBuilder object where additional options for this test can be specified via builder methods.
Remarks
Registers a new GameTest function that is designed for asynchronous execution. This GameTest will become available in Minecraft via /gametest run [testClassName]:[testName].

Write Privilege
This function can't be called in read-only mode.

This function can be called in early-execution mode.
Example: simpleMobAsyncTest.ts
```
import * as gameTest from '@minecraft/server-gametest';

gameTest
    .registerAsync('StarterTests', 'simpleMobTest', async (test: gameTest.Test) => {
        const attackerId = 'fox';
        const victimId = 'chicken';

        test.spawn(attackerId, { x: 5, y: 2, z: 5 });
        test.spawn(victimId, { x: 2, y: 2, z: 2 });

        test.assertEntityPresentInArea(victimId, true);

        test.succeedWhen(() => {
            test.assertEntityPresentInArea(victimId, false);
        });
    })
    .maxTicks(400)
    .structureName('gametests:mediumglass');
```