DynamicMetaClassTest.groovy

import org.junit.Test

import javax.script.Bindings

class Tests
{
    @Test
    def void testSP()
    {
        def p = new Foo()
        assert p.properties.containsKey('bar')
    }

    @Test
    def void testDP()
    {
        def p = new Foo()
        p.addDP("xyz", "abc")

        assert p.properties.containsKey('bar')
        assert p.properties.containsKey('xyz')
    }

    @Test
    def void testDP_clone()
    {
        def p = new Foo()
        Foo.addDP("xyz", "abc")

        assert p.bar == "baz"
        assert p.xyz == "abc"

        Foo p2 = p.clone()

        assert p2.bar == "baz"
        assert p2.xyz == "abc"


    }

    @Test
    def void testDP_MCinvokeConstructor()
    {
        def p = new Foo()
        Foo.addDP("xyz", "abc")

        assert p.bar == "baz"
        assert p.xyz == "abc"

        Foo p2 = Foo.metaClass.invokeConstructor(bar:'123')

        assert p2.bar == "123"
        assert p2.xyz == "abc"
    }

    @Test
    def void testDP_newFoo()
    {
        def p = new Foo()
        Foo.addDP("xyz", "abc")

        def p2 = new Foo()

        assert p2.bar == "baz"
        assert p2.xyz == "abc"
//        assert p2.properties.containsKey('xyz')
    }

    @Test
    def void testDP_newInstance()
    {
        Foo.addDP("xyz", "abc")

        def p = new Foo()

        assert p.properties.containsKey('bar')
        assert p.properties.containsKey('xyz')

        def p2 = Foo.newInstance()

        assert p2.properties.containsKey('bar')
        assert p2.properties.containsKey('xyz')
    }

}

class Foo implements Cloneable
{
    def bar = "baz"

    static def addDP(String name, Object value)
    {
        Foo.metaClass {
            "get${name.capitalize()}" {
                println "getter called: ${name}"
                value
            }
        }
    }

    Object clone() { super.clone() }
}