[Home Controls] Add null safety to comparator.

Add a default value to load label. Add a test file and unit test.

Test: Added a unit test and tested behavior on device.
Bug: 232271552
Change-Id: If9aa1d08366c5ada5d3530b24b690970b743113f

packages/SystemUI/src/com/android/systemui/controls/management/AppAdapter.kt

@@ -62,7 +62,7 @@ class AppAdapter(
             backgroundExecutor.execute {
                 val collator = Collator.getInstance(resources.configuration.locales[0])
                 val localeComparator = compareBy<ControlsServiceInfo, CharSequence>(collator) {
-                    it.loadLabel()
+                    it.loadLabel() ?: ""
                 }
                 listOfServices = serviceInfos.sortedWith(localeComparator)
                 uiExecutor.execute(::notifyDataSetChanged)

packages/SystemUI/tests/src/com/android/systemui/controls/management/AppAdapterTest.kt

@@ -0,0 +1,84 @@
+/*
+ * 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.systemui.controls.management
+
+import android.content.ComponentName
+import android.content.res.Resources
+import android.testing.AndroidTestingRunner
+import android.testing.TestableLooper
+import android.view.LayoutInflater
+import androidx.test.filters.SmallTest
+import com.android.settingslib.core.lifecycle.Lifecycle
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.controls.ControlsServiceInfo
+import com.android.systemui.util.concurrency.FakeExecutor
+import com.android.systemui.util.mockito.any
+import com.android.systemui.util.time.FakeSystemClock
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.ArgumentCaptor
+import org.mockito.Mock
+import org.mockito.Mockito.mock
+import org.mockito.Mockito.verify
+import org.mockito.Mockito.`when`
+import org.mockito.MockitoAnnotations
+
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+@TestableLooper.RunWithLooper(setAsMainLooper = true)
+class AppAdapterTest : SysuiTestCase() {
+    private val fakeSystemClock = FakeSystemClock()
+    private val backgroundExecutor = FakeExecutor(fakeSystemClock)
+    private val uiExecutor = FakeExecutor(fakeSystemClock)
+    @Mock lateinit var lifecycle: Lifecycle
+    @Mock lateinit var controlsListingController: ControlsListingController
+    @Mock lateinit var layoutInflater: LayoutInflater
+    @Mock lateinit var onAppSelected: (ComponentName?) -> Unit
+    @Mock lateinit var favoritesRenderer: FavoritesRenderer
+    val resources: Resources = context.resources
+    lateinit var adapter: AppAdapter
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        adapter = AppAdapter(backgroundExecutor,
+            uiExecutor,
+            lifecycle,
+            controlsListingController,
+            layoutInflater,
+            onAppSelected,
+            favoritesRenderer,
+            resources)
+    }
+
+    @Test
+    fun testOnServicesUpdated_nullLoadLabel() {
+        val captor = ArgumentCaptor
+            .forClass(ControlsListingController.ControlsListingCallback::class.java)
+        val controlsServiceInfo = mock(ControlsServiceInfo::class.java)
+        val serviceInfo = listOf(controlsServiceInfo)
+        `when`(controlsServiceInfo.loadLabel()).thenReturn(null)
+        verify(controlsListingController).observe(any(Lifecycle::class.java), captor.capture())
+
+        captor.value.onServicesUpdated(serviceInfo)
+        backgroundExecutor.runAllReady()
+        uiExecutor.runAllReady()
+
+        assertThat(adapter.itemCount).isEqualTo(serviceInfo.size)
+    }
+}