Add a new field elapsed_time_millis into Settings' atom

- Add a new field elapsed_time_millis to keep the elapsed time
  since setup wizard finished.

Fixes: 260660970
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.core
Change-Id: I28d13c4987ae1e4ef12eaff27e26a5121cf8093b

tests/robotests/src/com/android/settings/core/instrumentation/ElapsedTimeUtilsTest.java

@@ -0,0 +1,88 @@
+/*
+ * 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.settings.core.instrumentation;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class ElapsedTimeUtilsTest {
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+    }
+
+    @Test
+    public void storeSuwFinishedTimestamp_firstTimeAccess_shouldStoreTimestamp() {
+        final long timestamp = 1000000L;
+
+        ElapsedTimeUtils.storeSuwFinishedTimestamp(mContext, timestamp);
+
+        final long result = ElapsedTimeUtils.getSuwFinishedTimestamp(mContext);
+        assertThat(result).isEqualTo(timestamp);
+    }
+
+    @Test
+    public void storeSuwFinishedTimestamp_NotFirstTimeAccess_shouldNotStoreTimestamp() {
+        final long timestamp = 1000000L;
+
+        ElapsedTimeUtils.storeSuwFinishedTimestamp(mContext, timestamp);
+        ElapsedTimeUtils.storeSuwFinishedTimestamp(mContext, 2000000L);
+
+        final long result = ElapsedTimeUtils.getSuwFinishedTimestamp(mContext);
+        assertThat(result).isEqualTo(timestamp);
+    }
+
+    @Test
+    public void getElapsedTime_valueInPrefs_positiveElapsedTime_returnElapsedTime() {
+        final long suwTime = 1000L;
+        final long actionTime = 2000L;
+        ElapsedTimeUtils.storeSuwFinishedTimestamp(mContext, suwTime);
+
+        final long result = ElapsedTimeUtils.getElapsedTime(actionTime);
+
+        assertThat(result).isEqualTo(actionTime - suwTime);
+    }
+
+    @Test
+    public void getElapsedTime_valueInPrefs_negativeElapsedTime_returnDefault() {
+        final long suwTime = 2000L;
+        final long actionTime = 1000L;
+        ElapsedTimeUtils.storeSuwFinishedTimestamp(mContext, suwTime);
+
+        final long result = ElapsedTimeUtils.getElapsedTime(actionTime);
+
+        assertThat(result).isEqualTo(ElapsedTimeUtils.DEFAULT_SETUP_TIME);
+    }
+
+    @Test
+    public void getElapsedTime_noValueInPrefs_returnDefault() {
+        final long actionTime = 1000L;
+
+        final long result = ElapsedTimeUtils.getElapsedTime(actionTime);
+
+        assertThat(result).isEqualTo(ElapsedTimeUtils.DEFAULT_SETUP_TIME);
+    }
+}