test: add coverage for signTransactionForSession

[yelistratov1994]

Adds direct unit coverage for signTransactionForSession.

Changes

• add a direct action test file for signTransactionForSession
• verify session hook data is passed through to signTransaction
• verify customPaymasterHandler is forwarded
• verify error handling for undeployed smart accounts
• verify error handling when to is missing

Validation

• pnpm --filter @abstract-foundation/agw-client typecheck
• pnpm exec vitest run test/src/actions/signTransactionForSession.test.ts --environment node --reporter verbose

---

PR-Codex overview

This PR introduces unit tests for the signTransactionForSession function in the signTransactionForSession.test.ts file, ensuring it behaves as expected under various scenarios, including valid and invalid inputs.

Detailed summary

• Added imports for necessary modules and types.
• Created mock clients using createClient, createWalletClient, and createPublicClient.
• Defined a sample transaction and session configuration.
• Implemented tests for:
  • Successful transaction signing.
  • Forwarding a custom paymaster handler.
  • Handling errors for un-deployed smart accounts.
  • Validating the presence of the transaction to field.

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[changeset-bot]

⚠️ No Changeset found

Latest commit: d12bb98

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR