Add a developer option to disable app child process restrictions

Bug: 205156966
Test: atest PhantomProcessPreferenceControllerTest
Change-Id: I87fd78b3dc7dea069823de6bef0bd7fe20d985ad

tests/unit/src/com/android/settings/development/PhantomProcessPreferenceControllerTest.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2022 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 android.util.FeatureFlagUtils.SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.os.Looper;
+import android.util.FeatureFlagUtils;
+
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class PhantomProcessPreferenceControllerTest {
+
+    private Context mContext;
+    private PhantomProcessPreferenceController mController;
+    private SwitchPreference mPreference;
+
+    @Before
+    public void setUp() {
+        mContext = ApplicationProvider.getApplicationContext();
+        mController = new PhantomProcessPreferenceController(mContext);
+        if (Looper.myLooper() == null) {
+            Looper.prepare();
+        }
+
+        final PreferenceManager preferenceManager = new PreferenceManager(mContext);
+        final PreferenceScreen screen = preferenceManager.createPreferenceScreen(mContext);
+        mPreference = new SwitchPreference(mContext);
+        mPreference.setKey(mController.getPreferenceKey());
+        screen.addPreference(mPreference);
+        mController.displayPreference(screen);
+    }
+
+    @Test
+    public void onPreferenceChanged_settingDisabled_shouldNotDisablePhantomProcessMonitor() {
+        mController.onPreferenceChange(mPreference, false /* new value */);
+
+        final boolean mode = !FeatureFlagUtils.isEnabled(mContext,
+                SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS);
+
+        assertThat(mode).isFalse();
+    }
+
+    @Test
+    public void onPreferenceChanged_settingEnabled_shouldDisablePhantomProcessMonitor() {
+        mController.onPreferenceChange(mPreference, true /* new value */);
+
+        final boolean mode = !FeatureFlagUtils.isEnabled(mContext,
+                SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS);
+
+        assertThat(mode).isTrue();
+    }
+
+    @Test
+    public void updateState_settingEnabled_preferenceShouldBeChecked() {
+        FeatureFlagUtils.setEnabled(mContext, SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS, false);
+
+        mController.updateState(mPreference);
+        assertThat(mPreference.isChecked()).isTrue();
+    }
+
+    @Test
+    public void updateState_settingDisabled_preferenceShouldNotBeChecked() {
+        FeatureFlagUtils.setEnabled(mContext, SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS, true);
+
+        mController.updateState(mPreference);
+        assertThat(mPreference.isChecked()).isFalse();
+    }
+
+    @Test
+    public void onDeveloperOptionsDisabled_shouldDisablePreference() {
+        mController.onDeveloperOptionsSwitchDisabled();
+        final boolean mode = !FeatureFlagUtils.isEnabled(mContext,
+                SETTINGS_ENABLE_MONITOR_PHANTOM_PROCS);
+
+        mController.updateState(mPreference);
+
+        assertThat(mode).isFalse();
+        assertThat(mPreference.isChecked()).isFalse();
+    }
+}