Add developer menu to enable/disable ART verifier.

The new developer option modifies the global setting "art_verifier_verify_debuggable"; it allows to check if the bytecode of the Debuggable Apps is correct, e.g. if it's using the correct APIs.

Test: make RunSettingsRoboTests ROBOTEST_FILTER=development
Bug: 124403695
Change-Id: I8e721d62c5ca6fb5f26d9b989a8242eece8f55ab

tests/robotests/src/com/android/settings/development/ArtVerifierPreferenceControllerTest.java

@@ -0,0 +1,109 @@
+/*
+ * 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.development;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class ArtVerifierPreferenceControllerTest {
+
+    @Mock
+    private SwitchPreference mPreference;
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
+
+    private Context mContext;
+    private ArtVerifierPreferenceController mController;
+
+    @Before
+    public void setup() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+        mController = new ArtVerifierPreferenceController(mContext);
+        when(mPreferenceScreen.findPreference(mController.getPreferenceKey()))
+            .thenReturn(mPreference);
+        mController.displayPreference(mPreferenceScreen);
+    }
+
+    @Test
+    public void onPreferenceChanged_settingEnabled_turnOnArtVerifier() {
+        mController.onPreferenceChange(mPreference, true /* new value */);
+
+        final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.ART_VERIFIER_VERIFY_DEBUGGABLE, -1 /* default */);
+
+        assertThat(mode).isEqualTo(ArtVerifierPreferenceController.SETTING_VALUE_ON);
+    }
+
+    @Test
+    public void onPreferenceChanged_settingDisabled_turnOffArtVerifier() {
+        mController.onPreferenceChange(mPreference, false /* new value */);
+
+        final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.ART_VERIFIER_VERIFY_DEBUGGABLE, -1 /* default */);
+
+        assertThat(mode).isEqualTo(ArtVerifierPreferenceController.SETTING_VALUE_OFF);
+    }
+
+    @Test
+    public void updateState_settingEnabled_preferenceShouldBeChecked() {
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.ART_VERIFIER_VERIFY_DEBUGGABLE,
+                ArtVerifierPreferenceController.SETTING_VALUE_ON);
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(true);
+    }
+
+    @Test
+    public void updateState_settingDisabled_preferenceShouldBeChecked() {
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.ART_VERIFIER_VERIFY_DEBUGGABLE,
+                ArtVerifierPreferenceController.SETTING_VALUE_OFF);
+        mController.updateState(mPreference);
+
+        verify(mPreference).setChecked(false);
+    }
+
+    @Test
+    public void onDeveloperOptionsSwitchDisabled_shouldDisablePreference() {
+        mController.onDeveloperOptionsSwitchDisabled();
+        final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.ART_VERIFIER_VERIFY_DEBUGGABLE, -1 /* default */);
+
+        assertThat(mode).isEqualTo(ArtVerifierPreferenceController.SETTING_VALUE_ON);
+        verify(mPreference).setEnabled(false);
+        verify(mPreference).setChecked(true);
+    }
+}