JMockit-Xtend

#13 JMockit-Xtend

Oct 21, 2012 | 12 minutes | Beginners, Xtend, Testing
JMockit-Xtend provides a collection of the extension and helper methods to integrate the popular java mocking framework JMockit with Xtend. In this episode I show how to setup a simple java project with Xtend/JMockit and how to test-drive a simple command-line application mocking system methods.
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Tests

xtend 
package test

import static extension org.eclipse.xtend.jmockit.JMockitExtension.*
import org.junit.Test
import prog.Prog
import mockit.Mocked
import org.eclipse.xtext.xbase.lib.InputOutput

class Test1 {
        @Mocked(methods = "println")
        InputOutput io
        
        @Mocked(methods = "exit")
        System s
        
        @Test
        def void testErrorIfNoArguments() {
                mock [
                        println(<String>with [contains("Error")])
                        System::exit(1)
                ]
                
                Prog::main(newArrayList as String[])
                
        }

        @Test
        def void testArgumentGetPrinted() {
                mock [
                        println("test1")
                        System::exit(0)
                        times = -1
                ]
                
                Prog::main(newArrayList("test1") as String[])
                
        }
}

Simple echo-like program

xtend 
package prog

class Prog {
        def static void main(String[] args) {
                if (args.size == 0) {
                        println("Error: no arguments")
                        System::exit(1)
                        return
                }
                println(args.get(0))
                System::exit(0)
        }
        
}