Add new expandable preference component

Bug: 177406865
Bug: 185187729
Test: make SettingsRoboTests
Test: make SettingsGoogleRoboTests
Change-Id: Id2b2a1f4fa557467efcaa013aa9e978b2c66d974

tests/robotests/src/com/android/settings/fuelgauge/ExpandDividerPreferenceTest.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2021 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.fuelgauge;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.android.settings.R;
+
+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 final class ExpandDividerPreferenceTest {
+
+    private Context mContext;
+    private ExpandDividerPreference mExpandDividerPreference;
+
+    @Mock private ImageView mImageView;
+    @Mock private TextView mTextView;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(RuntimeEnvironment.application);
+        mExpandDividerPreference = new ExpandDividerPreference(mContext);
+        doReturn(R.id.expand_title).when(mTextView).getId();
+        doReturn(R.id.expand_icon).when(mImageView).getId();
+    }
+
+    @Test
+    public void testConstructor_returnExpectedResult() {
+        assertThat(mExpandDividerPreference.getKey())
+            .isEqualTo(ExpandDividerPreference.PREFERENCE_KEY);
+        assertThat(mExpandDividerPreference.getLayoutResource())
+            .isEqualTo(R.layout.preference_expand_divider);
+    }
+
+    @Test
+    public void testSetTitle_setTitleContentIntoTextView() {
+        final String titleContent = "title content";
+        mExpandDividerPreference.mTextView = mTextView;
+
+        mExpandDividerPreference.setTitle(titleContent);
+        verify(mTextView).setText(titleContent);
+    }
+
+    @Test
+    public void testOnClick_switchExpandStateAndInvokeCallback() {
+        final boolean[] isExpandedArray = new boolean[] {false};
+        mExpandDividerPreference.mImageView = mImageView;
+        mExpandDividerPreference.setOnExpandListener(
+            isExpanded -> isExpandedArray[0] = isExpanded);
+
+        // Click the item first time from false -> true.
+        mExpandDividerPreference.onClick();
+        // Verifies the first time click result.
+        verify(mImageView).setImageResource(R.drawable.ic_settings_expand_less);
+        assertThat(isExpandedArray[0]).isTrue();
+
+        // Clicks the item second time from true -> false.
+        mExpandDividerPreference.onClick();
+        // Verifies the second time click result.
+        verify(mImageView).setImageResource(R.drawable.ic_settings_expand_more);
+        assertThat(isExpandedArray[0]).isFalse();
+    }
+
+    @Test
+    public void testSetIsExpanded_updateStateButNotInvokeCallback() {
+        final boolean[] isExpandedArray = new boolean[] {false};
+        mExpandDividerPreference.mImageView = mImageView;
+        mExpandDividerPreference.setOnExpandListener(
+            isExpanded -> isExpandedArray[0] = isExpanded);
+
+        mExpandDividerPreference.setIsExpanded(true);
+
+        verify(mImageView).setImageResource(R.drawable.ic_settings_expand_less);
+        assertThat(isExpandedArray[0]).isFalse();
+    }
+}