src/test/java/org/robolectric/shadows/RadioGroupTest.java

package org.robolectric.shadows;

import android.widget.RadioGroup;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.Robolectric;
import org.robolectric.TestRunners;

import java.util.ArrayList;
import java.util.Arrays;

import static org.fest.assertions.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;

@RunWith(TestRunners.WithDefaults.class)
public class RadioGroupTest {
    private static final int BUTTON_ID = 3245;

    @Test
    public void checkedRadioButtonId() throws Exception {
        RadioGroup radioGroup = new RadioGroup(Robolectric.application);
        assertThat(radioGroup.getCheckedRadioButtonId()).isEqualTo(-1);
        radioGroup.check(99);
        assertThat(radioGroup.getCheckedRadioButtonId()).isEqualTo(99);
    }

    @Test
    public void check_shouldCallOnCheckedChangeListener() throws Exception {
        RadioGroup radioGroup = new RadioGroup(Robolectric.application);
        TestOnCheckedChangeListener listener = new TestOnCheckedChangeListener();
        radioGroup.setOnCheckedChangeListener(listener);

        radioGroup.check(BUTTON_ID);

        assertEquals(Arrays.asList(BUTTON_ID), listener.onCheckedChangedCheckedIds);
        assertEquals(Arrays.asList(radioGroup), listener.onCheckedChangedGroups);
    }

    @Test
    public void clearCheck_shouldCallOnCheckedChangeListenerTwice() throws Exception {
        RadioGroup radioGroup = new RadioGroup(Robolectric.application);
        TestOnCheckedChangeListener listener = new TestOnCheckedChangeListener();

        radioGroup.check(BUTTON_ID);
        radioGroup.setOnCheckedChangeListener(listener);
        radioGroup.clearCheck();

        assertEquals(Arrays.asList(BUTTON_ID, -1), listener.onCheckedChangedCheckedIds);
        assertEquals(Arrays.asList(radioGroup, radioGroup), listener.onCheckedChangedGroups);

    }

    private static class TestOnCheckedChangeListener implements RadioGroup.OnCheckedChangeListener {
        public ArrayList<RadioGroup> onCheckedChangedGroups = new ArrayList<RadioGroup>();
        public ArrayList<Integer> onCheckedChangedCheckedIds = new ArrayList<Integer>();

        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            onCheckedChangedGroups.add(group);
            onCheckedChangedCheckedIds.add(checkedId);
        }
    }
}