MainActivity.java

package com.github.draftcode;

import roboguice.activity.RoboActivity;
import roboguice.inject.InjectExtra;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends RoboActivity {
    @InjectExtra("test")
    String a;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

MainActivityTest.java

package com.github.draftcode;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import roboguice.RoboGuice;
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.Intent;

import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.util.Modules;
import com.xtremelabs.robolectric.Robolectric;
import com.xtremelabs.robolectric.RobolectricTestRunner;

import static org.junit.Assert.fail;

@RunWith(RobolectricTestRunner.class)
public class MainActivityTest {
    MainActivity activity;

    @Test
    public void someTest() throws Exception {
        activity.onCreate(null);
        Assert.assertEquals("a", activity.a);
    }

    private class TestModule extends AbstractModule {
        @Override
        protected void configure() {
        }
    }

    @Before
    public void setUp() {
        activity = new MainActivity();
        Intent intent = new Intent();
        intent.putExtra("test", "a");
        activity.setIntent(intent);
        setUpRoboGuice(new TestModule(), activity);
    }

    @After
    public void tearDown() {
        tearDownRoboGuice();
    }

    // --------------------------------------

    protected void setUpRoboGuice(Module module, Context injectionContext) {
        Application app = Robolectric.application;
        Module m = Modules.override(RoboGuice.newDefaultRoboModule(app)).with(
                module);
        RoboGuice.setBaseApplicationInjector(app, RoboGuice.DEFAULT_STAGE, m);
        RoboGuice.injectMembers(injectionContext, this);
    }

    protected void setUpRoboGuice(Module module) {
        setUpRoboGuice(module, Robolectric.application);
    }

    protected void tearDownRoboGuice() {
        RoboGuice.util.reset();
    }
}