ObjectUnderTestInstantiationTest.java

package org.needle4j;

import java.lang.reflect.Field;

import org.junit.Test;
import org.needle4j.annotation.ObjectUnderTest;
import org.needle4j.reflection.ReflectionUtil;

@SuppressWarnings("unused")
public class ObjectUnderTestInstantiationTest {

    @ObjectUnderTest
    private MyEjbComponent ejbComponent;

    @ObjectUnderTest
    private PrivateConstructorClass privateConstructorClass;

    @ObjectUnderTest
    private NoArgsConstructorClass noArgsConstructorClass;

    @Test(expected = ObjectUnderTestInstantiationException.class)
    public void testInterfaceInstantiation() throws Exception {

        setInstanceIfNotNull("ejbComponent");
    }

    @Test(expected = ObjectUnderTestInstantiationException.class)
    public void testNoArgConstuctorInstantiation() throws Exception {
        setInstanceIfNotNull("noArgsConstructorClass");
    }

    @Test(expected = ObjectUnderTestInstantiationException.class)
    public void testNoPublicConstuctorInstantiation() throws Exception {
        setInstanceIfNotNull("privateConstructorClass");
    }

    private void setInstanceIfNotNull(final String fieldName) throws Exception {
        final NeedleTestcase needleTestcase = new NeedleTestcase() {
        };

        final Field field = ObjectUnderTestInstantiationTest.class.getDeclaredField(fieldName);
        final ObjectUnderTest objectUnderTestAnnotation = field.getAnnotation(ObjectUnderTest.class);

        ReflectionUtil.invokeMethod(needleTestcase, "setInstanceIfNotNull", field, objectUnderTestAnnotation, this);

    }
}