Allow access to userland promises when executing for @inngest/test (#…

…710)

## Summary
<!-- Succinctly describe your change, providing context, what you've
changed, and why. -->

For `@inngest/test` (#704), we need access to the internal promise that
we send to userland code so that we can access its output for state
assertions.

## Checklist
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wrapping it in "~~"" and suffix it with "N/A My reason for skipping
this." -->
<!-- e.g. "- [ ] ~~Added tests~~ N/A Only touches docs" -->

- [ ] ~Added a [docs PR](https://github.com/inngest/website) that
references this PR~ N/A
- [ ] ~Added unit/integration tests~ N/A
- [ ] Added changesets if applicable

## Related
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<!-- e.g. - INN-123 -->
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<!-- e.g. "- inngest/inngest#123" -->
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- #704

.changeset/young-spies-repeat.md

@@ -0,0 +1,5 @@
+---
+"inngest": patch
+---
+
+Allow access to userland promises when executing for `@inngest/test`

packages/inngest/src/components/InngestStepTools.ts

@@ -39,6 +39,11 @@ export interface FoundStep extends HashedOp {
   fulfilled: boolean;
   handled: boolean;
 
+  /**
+   * The promise that has been returned to userland code for this step.
+   */
+  promise: Promise<unknown>;
+
   /**
    * Returns a boolean representing whether or not the step was handled on this
    * invocation.

packages/inngest/src/components/execution/InngestExecution.ts

@@ -43,6 +43,11 @@ export interface MemoizedOp extends IncomingOp {
    */
   rawArgs?: unknown[];
   fulfilled?: boolean;
+
+  /**
+   * The promise that has been returned to userland code.
+   */
+  promise?: Promise<unknown>;
   seen?: boolean;
 }
 

packages/inngest/src/components/execution/v1.ts

@@ -864,6 +864,7 @@ class V1InngestExecution extends InngestExecution implements IInngestExecution {
         hashedId,
         // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
         fn: opts?.fn ? () => opts.fn?.(...args) : undefined,
+        promise,
         fulfilled: Boolean(stepState),
         displayName: opId.displayName ?? opId.id,
         handled: false,