Sf test

Salesforce Apex Test Generation, Review, and Execution

Expert Apex test engineer. Generate meaningful tests — not coverage padding — with proper isolation, bulk safety, permission awareness, and assertions that would actually catch regressions. Deploy and run via a Salesforce MCP server.

Dispatch

Parse $ARGUMENTS to determine which workflow to run:

First argument or intent	Workflow
generate, "write tests for X"	Generate Tests
review, "score my tests", "are these good"	Review Tests
run, "run the tests", "what's my coverage"	Run Tests
No argument	Ask which workflow; if a class name is given, default to Generate

Execution modes

Detect the execution mode once per session — see references/execution-modes.md. In sfdx-repo mode, read classes from disk; otherwise fetch via MCP. Initialize the org connection first (org_init — your MCP server's session-init step; if none exists, verify with SELECT Id FROM Organization LIMIT 1).

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Generate Tests

Phase 1: Understand the code under test

1. Fetch the target class/trigger body (Tooling API query on ApexClass / ApexTrigger, or read from disk in sfdx-repo mode).
2. Map the surface: public/global methods, @AuraEnabled, @InvocableMethod, @future, Queueable/Batchable/Schedulable interfaces, callouts (Http, HttpRequest, named credentials), DML and SOQL operations, custom exceptions, and branching logic.
3. Fetch dependencies that affect test data: required fields, validation rules, and record types on the objects touched (sobject_describe / metadata read). Tests fail in real orgs because of validation rules the generator never saw — check them up front.

Phase 2: Design the test plan

Build a test matrix BEFORE writing code. Cover every row that applies:

Dimension	What to include
Positive path	Each public method's happy path with realistic data
Negative path	Invalid inputs, empty lists, nulls, exception branches asserted via try/catch or Assert.fail() sentinel
Bulk	200-record operations through the same code path
Permissions	System.runAs() with a minimally-privileged user where the code enforces CRUD/FLS or sharing
Async	Test.startTest()/stopTest() to flush futures/queueables; Test.getEventBus().deliver() for platform events
Callouts	HttpCalloutMock / WebServiceMock implementations per external call
Boundary	Governor-relevant sizes, date boundaries, recursion guards

Present the matrix to the user when scope is ambiguous; otherwise proceed.

Phase 3: Generate the test class

Rules that make tests worth having:

• One test class per production class, named <ClassName>Test. @IsTest annotation, private, API version matching the class under test.
• @TestSetup for shared data; a TestDataFactory pattern (see references/test-patterns.md) when 3+ test classes need the same objects. Never SeeAllData=true unless testing something that genuinely requires org data (document why in a comment).
• Modern Assert class (Assert.areEqual, Assert.isTrue, Assert.fail) with a message on every assertion explaining what broke. Every test method asserts something meaningful — method-ran-without-error is not a test.
• Test.startTest()/stopTest() around the action under test only — not around data setup — so governor limits reset where it matters and async work flushes.
• Bulk test proves bulkification: build 200 records, run the path, assert on ALL results (not just the first record), and keep it under limits.
• runAs tests prove security: create a user with a minimal profile or permission set, System.runAs() the restricted path, assert the enforcement (exception or stripped fields) actually happens.
• No dependencies between test methods. Each method stands alone.

Phase 4: Deploy

Deploy the test class via the MCP metadata tool (metadata_create / metadata_update equivalents). On compile errors, fix and redeploy — common causes are missing required fields on test data (re-check Phase 1 findings) and API-version mismatches.

Phase 5: Run and report

Run the new tests (see Run Tests below), then report: pass/fail per method, coverage delta on the class under test, and the test-quality score (see Scoring). Flag any class still below 75% coverage — the deployment minimum — and below 85%, the recommended bar for AppExchange submissions.

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Review Tests

Score one or more existing test classes against the 120-point rubric.

1. Fetch the test class body plus the production classes it covers.
2. Evaluate each rubric category (below); cite line-level evidence for every deduction — "no message on Assert at line 42", not "assertions could be better".
3. Output a scored report:

Test class	Score	%	Verdict	Top issues
FooTest	96/120	80%	✅ Pass	No runAs coverage; 2 assert-free methods

Threshold: 80/120 (67%) passes; below that, list the remediation plan in priority order (missing assertions first — they're the cheapest fix with the highest regression-catching value).

Test-Quality Scoring (120 points)

Category	Points	What earns them
Assertion quality	25	Every method asserts outcomes with messages; negative paths assert exceptions; no assert-free methods
Data setup & isolation	20	@TestSetup / factory pattern; no SeeAllData; required fields handled; no inter-test dependencies
Bulk & governor safety	20	200-record path exercised; assertions over the full set; startTest/stopTest placed correctly
Coverage breadth	20	All public methods + branches; boundary cases; not just the happy path
Permission & sharing	15	runAs with restricted user where code enforces security; both allow and deny asserted
Async & callout handling	15	Mocks for every callout; async flushed and results asserted; platform events delivered
Structure & naming	5	<ClassName>Test naming; one concern per method; readable arrange-act-assert

Scoring notes: a test class with high line coverage but weak assertions caps at 60/120 — coverage without assertions is the most expensive false comfort in Salesforce development, and the rubric is deliberately built to punish it.

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Run Tests

MCP-first execution via the Tooling API (works in every execution mode; in cli mode sf apex run test is the alternate path):

1. Queue the run — Tooling API runTestsAsynchronous with the test class IDs, or insert an ApexTestQueueItem per class via Tooling DML.
2. Poll status — SELECT Id, Status, ApexClassId FROM ApexTestQueueItem WHERE ParentJobId = '<jobId>' until all rows are Completed, Failed, or Aborted.
3. Fetch results — SELECT Outcome, MethodName, Message, StackTrace, ApexClass.Name, RunTime FROM ApexTestResult WHERE AsyncApexJobId = '<jobId>'.
4. Fetch coverage — SELECT ApexClassOrTrigger.Name, NumLinesCovered, NumLinesUncovered FROM ApexCodeCoverageAggregate WHERE ApexClassOrTrigger.Name IN (...) (Tooling API).
5. Report — pass/fail table, failure messages with stack traces, coverage per class, org-wide coverage if requested. For failures, offer to hand off to sf-debug (log analysis) or sf-apex (fix the production code).

Never run tests you just generated against a production org without telling the user — test runs consume async capacity and coverage recalculation can be slow in large orgs. Prefer sandboxes when the user has one connected.

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Cross-skill handoffs

• Production code fixes or refactors → sf-apex (150-point rubric)
• Test failures needing log analysis → sf-debug
• Coverage strategy for an AppExchange submission → sf-security (review-readiness checklist includes the 75% bar and test quality)

References

File	Read when
references/test-patterns.md	Writing factories, mocks, async/event tests, runAs patterns
references/execution-modes.md	Start of session — detect mode