Fix cannot switch between multiple TTS engines

- We didn't reset reset radio button state when user click back
while dialog was popped. Change the UI, when user really accepts the
dialog content, then changes radio button state.
- Migrate TtsEnginePreferenceFragment to RadioButtonPickerFragment

Fixes: 135588938
Test: manual
Change-Id: Ia824e08d59c77a23e6590ff0f5b7d897a73a1ff8

tests/robotests/src/com/android/settings/tts/TtsEnginePreferenceFragmentTest.java

@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2019 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.tts;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.content.pm.ServiceInfo;
+import android.os.Bundle;
+import android.speech.tts.TextToSpeech;
+import android.speech.tts.TtsEngines;
+
+import com.android.settings.testutils.shadow.ShadowTtsEngines;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.shadow.api.Shadow;
+import org.robolectric.shadows.ShadowPackageManager;
+import org.robolectric.shadows.androidx.fragment.FragmentController;
+
+@RunWith(RobolectricTestRunner.class)
+public class TtsEnginePreferenceFragmentTest {
+
+    private Context mContext;
+    private TtsEnginePreferenceFragment mTtsEnginePreferenceFragment;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+
+        final ResolveInfo info = new ResolveInfo();
+        final ServiceInfo serviceInfo = spy(new ServiceInfo());
+        serviceInfo.packageName = mContext.getPackageName();
+        serviceInfo.name = mContext.getClass().getName();
+        info.serviceInfo = serviceInfo;
+        doReturn("title").when(serviceInfo).loadLabel(any(PackageManager.class));
+        doReturn(1).when(serviceInfo).getIconResource();
+
+        final ShadowPackageManager spm = Shadow.extract(mContext.getPackageManager());
+        spm.addResolveInfoForIntent(
+                new Intent(TextToSpeech.Engine.INTENT_ACTION_TTS_SERVICE), info);
+    }
+
+    @After
+    public void tearDown() {
+        ShadowTtsEngines.reset();
+    }
+
+    @Test
+    public void getCandidates_AddEngines_returnCorrectEngines() {
+        mTtsEnginePreferenceFragment = FragmentController.of(new TtsEnginePreferenceFragment(),
+                new Bundle())
+                .create()
+                .get();
+
+        assertThat(mTtsEnginePreferenceFragment.getCandidates().size()).isEqualTo(1);
+    }
+
+    @Test
+    @Config(shadows = {ShadowTtsEngines.class})
+    public void getDefaultKey_validKey_returnCorrectKey() {
+        final String TEST_ENGINE = "test_engine";
+        final TtsEngines engine = mock(TtsEngines.class);
+        ShadowTtsEngines.setInstance(engine);
+        mTtsEnginePreferenceFragment = FragmentController.of(new TtsEnginePreferenceFragment(),
+                new Bundle())
+                .create()
+                .get();
+        when(engine.getDefaultEngine()).thenReturn(TEST_ENGINE);
+
+        assertThat(mTtsEnginePreferenceFragment.getDefaultKey()).isEqualTo(TEST_ENGINE);
+    }
+
+    @Test
+    @Config(shadows = {ShadowTtsEngines.class})
+    public void setDefaultKey_validKey_callingTtsEngineFunction() {
+        final TtsEngines engine = mock(TtsEngines.class);
+        ShadowTtsEngines.setInstance(engine);
+        mTtsEnginePreferenceFragment = FragmentController.of(new TtsEnginePreferenceFragment(),
+                new Bundle())
+                .create()
+                .get();
+
+        mTtsEnginePreferenceFragment.setDefaultKey(mContext.getPackageName());
+
+        verify(engine).isEngineInstalled(mContext.getPackageName());
+    }
+
+    @Test
+    public void setDefaultKey_validKey_updateCheckedState() {
+        mTtsEnginePreferenceFragment = spy(FragmentController.of(new TtsEnginePreferenceFragment(),
+                new Bundle())
+                .create()
+                .get());
+
+        mTtsEnginePreferenceFragment.setDefaultKey(mContext.getPackageName());
+
+        verify(mTtsEnginePreferenceFragment).updateCheckedState(mContext.getPackageName());
+    }
+}