How to get result of all test steps in groovy test step of last test suite.

While this is not eaxctly what you asked, here is a project teardown script that iterates through all of its test suites, cases, and steps to get the results, this may point you in the right direction.

log.info('Project ' + runner.getProject().getName() + ' TestRunner.Status = ' + runner.getStatus())

runner.getResults().each{ testSuiteRunner ->

	log.info('Test Suite ' + testSuiteRunner.getTestSuite().getName() + ' TestRunner.Status = ' + testSuiteRunner.getStatus())
	
	testSuiteRunner.getResults().each{ testCaseRunner ->
	
		log.info('Test Case ' + testCaseRunner.getTestCase().getName() + ' TestRunner.Status = ' + testCaseRunner.getStatus())

		testCaseRunner.getResults().each{ testStepResult -> 
			log.info('Test Step ' + testStepResult.getTestStep().getName() + ' TestStepResult.TestStepStatus = ' + testStepResult.getStatus())
		}
	}
}

Take a look at the TestRunner interface and it various subinterfaces for more information.

The following post:

https://community.smartbear.com/t5/SoapUI-NG/how-can-I-invalidate-a-test-if-the-data-is-not-found-on-a/m-p/128027#M29521

Details how to deal with test steps that do not have assertions (eg groovy test step)

As for messages, the TestStepResult has a getMessages() method that returns an array of strings, you could add in something to the processing of the test step results above like:

// Assumes you've already defined the variable testStepResult
if(testStepResult.getStatus().toString() != 'OK' ){
	testStepResult.getMessages().each{ message ->
		log.error('message = ' + message) 
	}
}