Agent Action Unit Tests

Agent Action Unit Tests

Agent actions are Apex classes with @InvocableMethod. They need the same testing rigor as any deployed Apex — plus two extras: every reason_code branch must be asserted, and the bulk-size contract (≤200 per invocation) must be verified.

Recommended Workflow

1. List every reason_code the action can return; write one test per code.
2. Write a bulk test that submits 200 Request records and asserts 200 Response records come back — no Limits.getDMLStatements() >150 failures.
3. For callout actions, use Test.setMock with canned 200/4xx/5xx responses and assert the branch classification.
4. Assert on Response.reason_code, never on Response.user_message text (the text can change for UX; the code is the contract).
5. Run sf apex run test -c and confirm per-class coverage ≥85% AND every reason_code has an explicit assertion.

Key Considerations

• Coverage % alone is misleading; the requirement is per-reason-code assertion coverage.
• Don't assert on user_message — it's UX copy; it will change.
• Mock every callout; no real HTTP from tests.

Worked Examples (see references/examples.md)

• Per-reason-code test matrix — CloseCaseAction returns OK | VALIDATION_BLOCKED | UNKNOWN.
• Bulk-safety harness — Agent batches 200 requests into one action invocation.

Common Gotchas (see references/gotchas.md)

• Test.startTest/stopTest required for async — Queueable from inside Invocable doesn't run in test without the boundary.
• @InvocableVariable default values — Missing fields on Request become null, not default.
• Asserting on user_message strings — UX change breaks 40 tests at once.

Top LLM Anti-Patterns (full list in references/llm-anti-patterns.md)

• Testing only the happy path with coverage padding.
• Asserting on user_message text.
• Skipping the bulk test because 'the agent only sends one at a time right now'.

Official Sources Used

• Agentforce Developer Guide — https://developer.salesforce.com/docs/einstein/genai/guide/agentforce.html
• Einstein Trust Layer — https://help.salesforce.com/s/articleView?id=sf.generative_ai_trust_layer.htm
• Invocable Actions (Apex) — https://developer.salesforce.com/docs/atlas.en-us.apexref.meta/apexref/apex_classes_invocable_action.htm
• Agentforce Testing Center — https://help.salesforce.com/s/articleView?id=sf.agentforce_testing_center.htm