[Settings] Code refactor for SIM change detection

Code refactor for maintainance:
  Move subscription change monitor out of ResetnetworkConfirm

Bug: 259611847
Test: local test, auto testing
Change-Id: I97a251ced4435d0cc390b40028edef07fd71e24f

tests/unit/src/com/android/settings/ResetSubscriptionContractTest.java

@@ -0,0 +1,109 @@
+/*
+ * 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;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+import android.telephony.SubscriptionManager.OnSubscriptionsChangedListener;
+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 ResetSubscriptionContractTest {
+
+    private static final int SUB_ID_1 = 3;
+    private static final int SUB_ID_2 = 8;
+
+    @Mock
+    private SubscriptionManager mSubscriptionManager;
+    @Mock
+    private OnSubscriptionsChangedListener mOnSubscriptionsChangedListener;
+    @Mock
+    private SubscriptionInfo mSubscriptionInfo1;
+    @Mock
+    private SubscriptionInfo mSubscriptionInfo2;
+
+    private Context mContext;
+    private ResetNetworkRequest mRequestArgs;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        mRequestArgs = new ResetNetworkRequest(new Bundle());
+    }
+
+    private ResetSubscriptionContract createTestObject() {
+        return new ResetSubscriptionContract(mContext, mRequestArgs) {
+            @Override
+            protected SubscriptionManager getSubscriptionManager() {
+                return mSubscriptionManager;
+            }
+            @Override
+            protected OnSubscriptionsChangedListener getChangeListener() {
+                return mOnSubscriptionsChangedListener;
+            }
+        };
+    }
+
+    @Test
+    public void getAnyMissingSubscriptionId_returnNull_whenNoSubscriptionChange() {
+        mRequestArgs.setResetTelephonyAndNetworkPolicyManager(SUB_ID_1);
+        doReturn(mSubscriptionInfo1).when(mSubscriptionManager)
+                .getActiveSubscriptionInfo(SUB_ID_1);
+        mRequestArgs.setResetApn(SUB_ID_2);
+        doReturn(mSubscriptionInfo2).when(mSubscriptionManager)
+                .getActiveSubscriptionInfo(SUB_ID_2);
+
+        ResetSubscriptionContract target = createTestObject();
+
+        verify(mSubscriptionManager).addOnSubscriptionsChangedListener(any(), any());
+
+        assertNull(target.getAnyMissingSubscriptionId());
+    }
+
+    @Test
+    public void getAnyMissingSubscriptionId_returnSubId_whenSubscriptionNotActive() {
+        mRequestArgs.setResetTelephonyAndNetworkPolicyManager(SUB_ID_1);
+        doReturn(mSubscriptionInfo1).when(mSubscriptionManager)
+                .getActiveSubscriptionInfo(SUB_ID_1);
+        mRequestArgs.setResetApn(SUB_ID_2);
+        doReturn(null).when(mSubscriptionManager)
+                .getActiveSubscriptionInfo(SUB_ID_2);
+
+        ResetSubscriptionContract target = createTestObject();
+
+        verify(mSubscriptionManager).addOnSubscriptionsChangedListener(any(), any());
+
+        assertEquals(target.getAnyMissingSubscriptionId(), new Integer(SUB_ID_2));
+    }
+}