salesforce-composite-envelope-builder/composite-envelope-builder/force-app/main/default/classes/DocusignCompositeEnvelopeBuilderTest.cls

        // Assert
        System.assertEquals(true, results[0].success, 'Should succeed without subject');
    }
    
    @isTest
    static void testEmailSubjectTruncation() {
        // Arrange
        dfsle.TestUtils.setMock(new dfsle.ESignatureAPIMock());
        
        DocusignEnvelopeRequest req = new DocusignEnvelopeRequest();
        req.templateIds = new List<String>{'01234567-abcd-ef01-2345-6789abcdef01'};
        req.recordId = '001000000ABC123';
        // Create a subject longer than 100 characters
        req.emailSubject = 'This is a very long email subject that exceeds the one hundred character limit imposed by Docusign API requirements and should be truncated appropriately to prevent errors during envelope creation.';
        System.assert(req.emailSubject.length() > 100, 'Test setup: subject should be > 100 chars');
        
        // Act
        Test.startTest();
        List<DocusignEnvelopeResult> results = 
            DocusignCompositeEnvelopeBuilder.sendCompositeEnvelope(
                new List<DocusignEnvelopeRequest>{req}
            );
        Test.stopTest();
        
        // Assert
        System.assertEquals(true, results[0].success, 'Should succeed with truncated subject');
        // Note: We can't easily test the actual truncation in this mock-based test,
        // but the code change ensures truncation happens before the API call
    }
}