Add Low Storage slice to Contextual Settings Homepage

Bug: 114808204
Test: robotests, visual
Change-Id: I0c1a02dc40a0a72b7a2ad8f46505325e52bee942

tests/robotests/src/com/android/settings/homepage/contextualcards/slices/LowStorageSliceTest.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2018 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.homepage.contextualcards.slices;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import androidx.slice.Slice;
+import androidx.slice.SliceItem;
+import androidx.slice.SliceProvider;
+import androidx.slice.widget.SliceLiveData;
+
+import com.android.settings.R;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.SliceTester;
+import com.android.settingslib.deviceinfo.PrivateStorageInfo;
+import com.android.settingslib.deviceinfo.StorageVolumeProvider;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.annotation.Resetter;
+
+import java.util.List;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class LowStorageSliceTest {
+
+    private Context mContext;
+    private LowStorageSlice mLowStorageSlice;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+
+        // Set-up specs for SliceMetadata.
+        SliceProvider.setSpecs(SliceLiveData.SUPPORTED_SPECS);
+
+        mLowStorageSlice = new LowStorageSlice(mContext);
+    }
+
+    @After
+    public void tearDown() {
+        ShadowPrivateStorageInfo.reset();
+    }
+
+    @Test
+    @Config(shadows = ShadowPrivateStorageInfo.class)
+    public void getSlice_hasLowStorage_shouldBeCorrectSliceContent() {
+        ShadowPrivateStorageInfo.setPrivateStorageInfo(new PrivateStorageInfo(10L, 100L));
+
+        final Slice slice = mLowStorageSlice.getSlice();
+
+        final List<SliceItem> sliceItems = slice.getItems();
+        SliceTester.assertTitle(sliceItems, mContext.getString(R.string.storage_menu_free));
+    }
+
+    @Test
+    @Config(shadows = ShadowPrivateStorageInfo.class)
+    public void getSlice_hasNoLowStorage_shouldBeNull() {
+        ShadowPrivateStorageInfo.setPrivateStorageInfo(new PrivateStorageInfo(100L, 100L));
+
+        final Slice slice = mLowStorageSlice.getSlice();
+
+        assertThat(slice).isNull();
+    }
+
+    @Implements(PrivateStorageInfo.class)
+    public static class ShadowPrivateStorageInfo {
+
+        private static PrivateStorageInfo sPrivateStorageInfo = null;
+
+        @Resetter
+        public static void reset() {
+            sPrivateStorageInfo = null;
+        }
+
+        @Implementation
+        public static PrivateStorageInfo getPrivateStorageInfo(
+                StorageVolumeProvider storageVolumeProvider) {
+            return sPrivateStorageInfo;
+        }
+
+        public static void setPrivateStorageInfo(
+                PrivateStorageInfo privateStorageInfo) {
+            sPrivateStorageInfo = privateStorageInfo;
+        }
+    }
+}