Migrate Battery Saver

Add the skeleton of the Battery Saver

Test: atest BatterySaverScreenTest
Bug: 368359126
Flag: com.android.settings.flags.catalyst_battery_saver_screen
Change-Id: I05a694c34468c01e4e032275567acbf37615c6f0

tests/robotests/src/com/android/settings/fuelgauge/batterysaver/BatterySaverScreenTest.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2024 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.batterysaver
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.android.settings.flags.Flags
+import com.android.settingslib.preference.CatalystScreenTestCase
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class BatterySaverScreenTest : CatalystScreenTestCase() {
+
+    override val preferenceScreenCreator = BatterySaverScreen()
+
+    override val flagName: String
+        get() = Flags.FLAG_CATALYST_BATTERY_SAVER_SCREEN
+
+    @Test
+    fun key() {
+        assertThat(preferenceScreenCreator.key).isEqualTo(BatterySaverScreen.KEY)
+    }
+}