Three new test methods in DocusignESignatureServiceTest:
- createEnvelopeReturnsSuccessResultOnHttp201 (TC-001): mocks 201, asserts success=true, envelopeId, status
- createEnvelopeReturnsFailureResultOnHttp400 (TC-002): mocks 400, asserts success=false, errorMessage non-null
- createEnvelopeReturnsEarlyWhenEmailIsBlank: asserts early return with errorMessage when Appraiser_Email__c is blank
All 11 tests pass (11/11). Satisfies NFR-001 for createEnvelope().
Agent: claude-sonnet-4-6
Tests: 11/11 passing
Tests-Added: +3
TypeScript: N/A (Apex project)
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