Add controller for magnification feedback preference

The controller's logic determines the visibility of this preference
based on the availability of surveys, as reported by
SurveyFeatureProvider.isSurveyAvailable.

Bug: 380346799
Test: atest MagnificationFeedbackPreferenceControllerTest
Flag: com.android.server.accessibility.enable_low_vision_hats
Change-Id: I7fe7aa4418a6be38e9e7af7efc76a9a25266198b

tests/robotests/src/com/android/settings/accessibility/MagnificationFeedbackPreferenceControllerTest.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2025 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.accessibility;
+
+import static com.android.settings.accessibility.MagnificationFeedbackPreferenceController.FEEDBACK_KEY;
+import static com.android.settings.accessibility.MagnificationFeedbackPreferenceController.PREF_KEY;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+
+import androidx.core.util.Consumer;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.overlay.SurveyFeatureProvider;
+import com.android.settings.testutils.FakeFeatureFactory;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link MagnificationFeedbackPreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class MagnificationFeedbackPreferenceControllerTest {
+
+    @Rule
+    public MockitoRule mMockitoRule = MockitoJUnit.rule();
+
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    @Mock private PreferenceScreen mScreen;
+    @Mock private PreferenceManager mPreferenceManager;
+    @Mock private DashboardFragment mFragment;
+    private SurveyFeatureProvider mSurveyFeatureProvider;
+    private MagnificationFeedbackPreferenceController mController;
+    private Preference mPreference;
+
+    @Before
+    public void setUp() {
+        FakeFeatureFactory.setupForTest();
+        mSurveyFeatureProvider =
+                FakeFeatureFactory.getFeatureFactory().getSurveyFeatureProvider(mContext);
+        mController = new MagnificationFeedbackPreferenceController(mContext, mFragment, PREF_KEY);
+        mPreference = new Preference(mContext);
+        when(mFragment.getPreferenceManager()).thenReturn(mPreferenceManager);
+        when(mPreferenceManager.findPreference(PREF_KEY)).thenReturn(mPreference);
+        when(mFragment.getPreferenceScreen()).thenReturn(mScreen);
+    }
+
+    @Test
+    public void getAvailabilityStatus_shouldAlwaysBeAvailable() {
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(
+                MagnificationFeedbackPreferenceController.AVAILABLE);
+    }
+
+    @Test
+    public void updateState_surveyAvailable_preferenceEnabledWithSummary() {
+        doAnswer(invocation -> {
+            Consumer<Boolean> consumer = invocation.getArgument(2);
+            consumer.accept(true);
+            return null;
+        }).when(mSurveyFeatureProvider).checkSurveyAvailable(any(), eq(FEEDBACK_KEY), any());
+
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isEnabled()).isTrue();
+        assertThat(mPreference.getSummary()).isEqualTo(
+                mContext.getString(R.string.accessibility_feedback_summary));
+    }
+
+    @Test
+    public void updateState_surveyUnavailable_preferenceDisabledWithSummary() {
+        doAnswer(invocation -> {
+            Consumer<Boolean> consumer = invocation.getArgument(2);
+            consumer.accept(false);
+            return null;
+        }).when(mSurveyFeatureProvider).checkSurveyAvailable(any(), eq(FEEDBACK_KEY), any());
+
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isEnabled()).isFalse();
+        assertThat(mPreference.getSummary()).isEqualTo(
+                mContext.getString(R.string.accessibility_feedback_disabled_summary));
+    }
+
+    @Test
+    public void handlePreferenceTreeClick_shouldStartSurvey() {
+        mController.handlePreferenceTreeClick(mPreference);
+
+        verify(mSurveyFeatureProvider).sendActivityIfAvailable(FEEDBACK_KEY);
+    }
+}