[Settings] Code refactor - SIM slot UI preference key

Avoid from controlling Preference key separately in different places.

Bug: 261374879
Test: local & auto
Change-Id: I0a777c3f2511a25e8f619deba964bc343183c3cc

tests/unit/src/com/android/settings/deviceinfo/simstatus/SlotSimStatusTest.java

@@ -0,0 +1,85 @@
+/*
+ * 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.deviceinfo.simstatus;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.telephony.TelephonyManager;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class SlotSimStatusTest {
+
+    @Mock
+    private TelephonyManager mTelephonyManager;
+
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        mockService(Context.TELEPHONY_SERVICE, TelephonyManager.class, mTelephonyManager);
+    }
+
+    @Test
+    public void size_returnNumberOfPhone_whenQuery() {
+        doReturn(2).when(mTelephonyManager).getPhoneCount();
+
+        SlotSimStatus target = new SlotSimStatus(mContext);
+
+        assertEquals(new Integer(target.size()), new Integer(2));
+    }
+
+    @Test
+    public void getPreferenceOrdering_returnOrdering_whenQuery() {
+        doReturn(2).when(mTelephonyManager).getPhoneCount();
+
+        SlotSimStatus target = new SlotSimStatus(mContext);
+        target.setBasePreferenceOrdering(30);
+
+        assertEquals(new Integer(target.getPreferenceOrdering(1)), new Integer(32));
+    }
+
+    @Test
+    public void getPreferenceKey_returnKey_whenQuery() {
+        doReturn(2).when(mTelephonyManager).getPhoneCount();
+
+        SlotSimStatus target = new SlotSimStatus(mContext);
+        target.setBasePreferenceOrdering(50);
+
+        assertEquals(target.getPreferenceKey(1), "sim_status52");
+    }
+
+    private <T> void mockService(String serviceName, Class<T> serviceClass, T service) {
+        when(mContext.getSystemServiceName(serviceClass)).thenReturn(serviceName);
+        when(mContext.getSystemService(serviceName)).thenReturn(service);
+    }
+}