Using junit4 with Groovy

Person.groovy

// based on groovy docs


class Person {
    String first, last
}

class Family {
    Person father, mother
    def nameOfMother() { "$mother.first $mother.last" }
    def nameOfFather() { "$father.first $father.last" }
}

PersonTest.groovy

import groovy.mock.interceptor.MockFor
import org.junit.Test


import static org.junit.Assert.assertThat

import static org.hamcrest.CoreMatchers.notNullValue
import static org.hamcrest.CoreMatchers.nullValue
import static org.hamcrest.CoreMatchers.is
import static org.hamcrest.CoreMatchers.not
import static org.hamcrest.CoreMatchers.equalTo
import static org.hamcrest.CoreMatchers.instanceOf
import static org.hamcrest.CoreMatchers.sameInstance
import static org.hamcrest.CoreMatchers.any
import static org.hamcrest.CoreMatchers.anything
import static org.hamcrest.CoreMatchers.allOf
import static org.hamcrest.CoreMatchers.anyOf

class PersonTest {

    @Test
    void mary() {
        def mary = new Person(first: 'Mary', last: 'Smith')
        // with groovy 'power' assert:
        assert mary.first == 'Mary'
    }


    @Test void maryFirstSameInstanceAs() {
        def name = 'Mary'
        def mary = new Person(first: name, last: 'Smith')
        // using assertThat + Hamcrest matchers
        assertThat "are instance equal",  mary.first, is(sameInstance(name))
    }

    @Test void maryWithMock() {
        // using groovy mockFor http://groovy-lang.org/testing.html
        def mock = new MockFor(Person)
        mock.demand.getFirst{ -> 'dummy' }
        mock.demand.getLast{ -> 'name' }
        mock.demand.getFirst{ 'second' }
        mock.demand.getLast{ 'N2M2' }
        mock.use {
            def mary = new Person(first:'Mary', last:'Smith')
            def f = new Family(mother:mary)
            f.father = new Person(first:'Frank', last:'Oz')
            assert f.nameOfMother() == 'dummy name'
            assert f.nameOfFather() == 'second N2M2'
        }
        mock.expect.verify()

    }
}