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A collection of tests that can certify language implementation to be compliant with most recent requirements of the Truffle infrastructure and tooling.
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package org.junit.runners.model;

import static java.lang.reflect.Modifier.isStatic;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.internal.MethodSorter;

/**
 * Wraps a class to be run, providing method validation and annotation searching
 *
 * @since 4.5
 */
public class TestClass {
    private final Class fClass;

    private Map, List> fMethodsForAnnotations = new HashMap, List>();

    private Map, List> fFieldsForAnnotations = new HashMap, List>();

    /**
     * Creates a {@code TestClass} wrapping {@code klass}. Each time this
     * constructor executes, the class is scanned for annotations, which can be
     * an expensive process (we hope in future JDK's it will not be.) Therefore,
     * try to share instances of {@code TestClass} where possible.
     */
    public TestClass(Class klass) {
        fClass = klass;
        if (klass != null && klass.getConstructors().length > 1) {
            throw new IllegalArgumentException(
                    "Test class can only have one constructor");
        }

        for (Class eachClass : getSuperClasses(fClass)) {
            for (Method eachMethod : MethodSorter.getDeclaredMethods(eachClass)) {
                addToAnnotationLists(new FrameworkMethod(eachMethod),
                        fMethodsForAnnotations);
            }
            for (Field eachField : eachClass.getDeclaredFields()) {
                addToAnnotationLists(new FrameworkField(eachField),
                        fFieldsForAnnotations);
            }
        }
    }

    private > void addToAnnotationLists(T member,
            Map, List> map) {
        for (Annotation each : member.getAnnotations()) {
            Class type = each.annotationType();
            List members = getAnnotatedMembers(map, type);
            if (member.isShadowedBy(members)) {
                return;
            }
            if (runsTopToBottom(type)) {
                members.add(0, member);
            } else {
                members.add(member);
            }
        }
    }

    /**
     * Returns, efficiently, all the non-overridden methods in this class and
     * its superclasses that are annotated with {@code annotationClass}.
     */
    public List getAnnotatedMethods(
            Class annotationClass) {
        return getAnnotatedMembers(fMethodsForAnnotations, annotationClass);
    }

    /**
     * Returns, efficiently, all the non-overridden fields in this class and its
     * superclasses that are annotated with {@code annotationClass}.
     */
    public List getAnnotatedFields(
            Class annotationClass) {
        return getAnnotatedMembers(fFieldsForAnnotations, annotationClass);
    }

    private  List getAnnotatedMembers(Map, List> map,
            Class type) {
        if (!map.containsKey(type)) {
            map.put(type, new ArrayList());
        }
        return map.get(type);
    }

    private boolean runsTopToBottom(Class annotation) {
        return annotation.equals(Before.class)
                || annotation.equals(BeforeClass.class);
    }

    private List> getSuperClasses(Class testClass) {
        ArrayList> results = new ArrayList>();
        Class current = testClass;
        while (current != null) {
            results.add(current);
            current = current.getSuperclass();
        }
        return results;
    }

    /**
     * Returns the underlying Java class.
     */
    public Class getJavaClass() {
        return fClass;
    }

    /**
     * Returns the class's name.
     */
    public String getName() {
        if (fClass == null) {
            return "null";
        }
        return fClass.getName();
    }

    /**
     * Returns the only public constructor in the class, or throws an {@code
     * AssertionError} if there are more or less than one.
     */

    public Constructor getOnlyConstructor() {
        Constructor[] constructors = fClass.getConstructors();
        Assert.assertEquals(1, constructors.length);
        return constructors[0];
    }

    /**
     * Returns the annotations on this class
     */
    public Annotation[] getAnnotations() {
        if (fClass == null) {
            return new Annotation[0];
        }
        return fClass.getAnnotations();
    }

    public  List getAnnotatedFieldValues(Object test,
            Class annotationClass, Class valueClass) {
        List results = new ArrayList();
        for (FrameworkField each : getAnnotatedFields(annotationClass)) {
            try {
                Object fieldValue = each.get(test);
                if (valueClass.isInstance(fieldValue)) {
                    results.add(valueClass.cast(fieldValue));
                }
            } catch (IllegalAccessException e) {
                throw new RuntimeException(
                        "How did getFields return a field we couldn't access?", e);
            }
        }
        return results;
    }

    public  List getAnnotatedMethodValues(Object test,
            Class annotationClass, Class valueClass) {
        List results = new ArrayList();
        for (FrameworkMethod each : getAnnotatedMethods(annotationClass)) {
            try {
                Object fieldValue = each.invokeExplosively(test, new Object[]{});
                if (valueClass.isInstance(fieldValue)) {
                    results.add(valueClass.cast(fieldValue));
                }
            } catch (Throwable e) {
                throw new RuntimeException(
                        "Exception in " + each.getName(), e);
            }
        }
        return results;
    }

    public boolean isANonStaticInnerClass() {
        return fClass.isMemberClass() && !isStatic(fClass.getModifiers());
    }
}