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A testing framework for the JVM
There is a newer version: 7.10.1
package org.testng;

import com.google.inject.Injector;
import com.google.inject.Module;
import org.testng.annotations.Guice;
import org.testng.collections.Lists;
import org.testng.internal.ClassImpl;
import org.testng.internal.annotations.AnnotationHelper;

import java.lang.annotation.Annotation;
import java.util.List;

class GuiceHelper {
    private final ITestContext context;
    GuiceHelper(ITestContext context) {
        this.context = context;
    }

    Injector getInjector(IClass iClass) {
        Annotation annotation = AnnotationHelper.findAnnotationSuperClasses(Guice.class, iClass.getRealClass());
        if (annotation == null) {
            return null;
        }
        if (iClass instanceof TestClass) {
            iClass = ((TestClass)iClass).getIClass();
        }
        if (!(iClass instanceof ClassImpl)) {
            return null;
        }
        Injector parentInjector = ((ClassImpl)iClass).getParentInjector();

        Guice guice = (Guice) annotation;
        List moduleInstances = Lists.newArrayList(getModules(guice, parentInjector, iClass.getRealClass()));

        // Reuse the previous injector, if any
        Injector injector = context.getInjector(moduleInstances);
        if (injector == null) {
            injector = parentInjector.createChildInjector(moduleInstances);
            context.addInjector(moduleInstances, injector);
        }
        return injector;
    }


    private List getModules(Guice guice, Injector parentInjector, Class testClass) {
        List result = Lists.newArrayList();
        for (Class moduleClass : guice.modules()) {
            List modules = context.getGuiceModules(moduleClass);
            if (modules != null && !modules.isEmpty()) {
                result.addAll(modules);
            } else {
                Module instance = parentInjector.getInstance(moduleClass);
                result.add(instance);
                context.getGuiceModules(moduleClass).add(instance);
            }
        }
        Class factory = guice.moduleFactory();
        if (factory != IModuleFactory.class) {
            IModuleFactory factoryInstance = parentInjector.getInstance(factory);
            Module moduleClass = factoryInstance.createModule(context, testClass);
            if (moduleClass != null) {
                result.add(moduleClass);
            }
        }

        return result;
    }

}