Fix more SettingsUITests

Also add SettingsUITests to postsubmit.

Bug: 290381395
Test: ui test
Change-Id: Ib1dd35bf7823290bf77deb31366e9cb6ae9f65f7

tests/uitests/src/com/android/settings/ui/DataSaverSettingsTest.kt

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2023 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.ui
+
+import android.provider.Settings
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.UiDevice
+import com.android.settings.ui.testutils.SettingsTestUtils.startMainActivityFromHomeScreen
+import com.android.settings.ui.testutils.SettingsTestUtils.waitObject
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class DataSaverSettingsTest {
+    private lateinit var device: UiDevice
+
+    @Before
+    fun setUp() {
+        device = startMainActivityFromHomeScreen(Settings.ACTION_DATA_SAVER_SETTINGS)
+    }
+
+    @Test
+    fun hasSwitchBar() {
+        assertThat(device.waitObject(By.text("Use Data Saver"))).isNotNull()
+    }
+}