How to call function from another groovy code?

Hi,

i have a project structure in soapui open source like this:

Projects

   -createperson(wsdl)

   -TestSuite1

        -TestCase-1

             -TestDB.groovy

    -TestSuite-2

         -TestCase-2

              -tests.groovy

TestDB.groovy

import com.eviware.soapui.model.testsuite.TestStepResult.TestStepStatus
import groovy.sql.Sql
import java.sql.ResultSet;

Properties props = new Properties()
File propsFile = new File('c://test//db.properties')
props.load(propsFile.newDataInputStream())

def url = props.getProperty("db_url")
def user = props.getProperty("db_user")
def password = props.getProperty("db_password")
def driver = props.getProperty("db_driver")

// Register the MySQL JDBC driver 
com.eviware.soapui.support.GroovyUtils.registerJdbcDriver( driver ) 

//Connect to the SQL instance.
def sql = Sql.newInstance(url, user, password, driver)


Class test{

def testFirstName() {

StringBuilder builder1 = new StringBuilder()
def value = sql.eachRow("select * from PERSON where ID = '123' ") { row -> 
   builder1.append( "${row.firsName}" )
}
//Set properties
String myvalue = builder1.toString()
def expected = "JOHN"
assert myvalue == expected
testRunner.testCase.setPropertyValue( "value",myvalue)

sql.close()
}
}

tests.groovy

import test
t = new testFirstname()
t.testFirstName()

Questions:

1- In tests.groovy, the line with import return error:

2- is it correct the way i'm importing function in tests.groovy ?