Refactor DefaultAppPicker to a general radio button picker

Bug: 36557316
Test: make RunSettingsRoboTests
Change-Id: I52985e527e55697cf29f8d97d775d4bbed025beb

tests/robotests/src/com/android/settings/widget/RadioButtonPickerFragmentTest.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.widget;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.UserManager;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.applications.defaultapps.DefaultAppInfo;
+import com.android.settings.applications.defaultapps.DefaultAppPickerFragment;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class RadioButtonPickerFragmentTest {
+
+
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private Activity mActivity;
+    @Mock
+    private PreferenceScreen mScreen;
+    @Mock
+    private UserManager mUserManager;
+
+    private TestFragment mFragment;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mFragment = spy(new TestFragment());
+
+        when(mActivity.getSystemService(Context.USER_SERVICE)).thenReturn(mUserManager);
+        doReturn(mActivity).when(mFragment).getContext();
+        doReturn(mScreen).when(mFragment).getPreferenceScreen();
+    }
+
+    @Test
+    public void onAttach_userIsInitialized() {
+        mFragment.onAttach((Context) mActivity);
+
+        verify(mActivity).getPackageManager();
+        verify(mActivity).getSystemService(Context.USER_SERVICE);
+    }
+
+    @Test
+    public void displaySingleOption_shouldSelectRadioButton() {
+        final RadioButtonPreference pref =
+                new RadioButtonPreference(RuntimeEnvironment.application);
+        when(mScreen.getPreferenceCount()).thenReturn(1);
+        when(mScreen.getPreference(0)).thenReturn(pref);
+
+        mFragment.mayCheckOnlyRadioButton();
+
+        assertThat(pref.isChecked()).isTrue();
+    }
+
+    @Test
+    public void clickPreference_shouldConfirm() {
+        final RadioButtonPreference pref =
+                new RadioButtonPreference(RuntimeEnvironment.application);
+        pref.setKey("TEST");
+
+        mFragment.onRadioButtonClicked(pref);
+
+        assertThat(mFragment.setDefaultKeyCalled).isTrue();
+    }
+
+    public static class TestFragment extends DefaultAppPickerFragment {
+
+        boolean setDefaultKeyCalled;
+
+        @Override
+        public int getMetricsCategory() {
+            return 0;
+        }
+
+        @Override
+        protected List<DefaultAppInfo> getCandidates() {
+            return new ArrayList<>();
+        }
+
+        @Override
+        protected String getDefaultKey() {
+            return null;
+        }
+
+        @Override
+        protected boolean setDefaultKey(String key) {
+            setDefaultKeyCalled = true;
+            return true;
+        }
+
+        @Override
+        public Context getContext() {
+            return RuntimeEnvironment.application;
+        }
+    }
+}