Reading/Setting test case properties?

Through a groovy script, I know how to read/set test properites associated with a property step... for example:

// define object
def test = testRunner.testCase.getTestStepByNam("testPropertyStep");

// read property value
def version = test.getPropertyValue("testProperty");

// this line would set a property
test.setPropertyValue("testProperty","XYZ");

Is there a way to define the "object" and then read/set properties that are defined as test case properties?

How about the same for test suite properties?

Thanks!
Jim