diff --git a/nearby/service/java/com/android/server/nearby/fastpair/cache/DiscoveryItem.java b/nearby/service/java/com/android/server/nearby/fastpair/cache/DiscoveryItem.java
index 961fe7a..5ce4488 100644
--- a/nearby/service/java/com/android/server/nearby/fastpair/cache/DiscoveryItem.java
+++ b/nearby/service/java/com/android/server/nearby/fastpair/cache/DiscoveryItem.java
@@ -107,15 +107,6 @@
     }
 
     /**
-     * Sets the store discovery item mac address.
-     */
-    public void setMacAddress(String address) {
-        mStoredDiscoveryItem = mStoredDiscoveryItem.toBuilder().setMacAddress(address).build();
-
-        mFastPairCacheManager.saveDiscoveryItem(this);
-    }
-
-    /**
      * Checks if the item is expired. Expired items are those over getItemExpirationMillis() eg. 2
      * minutes
      */
diff --git a/nearby/service/java/com/android/server/nearby/fastpair/cache/FastPairCacheManager.java b/nearby/service/java/com/android/server/nearby/fastpair/cache/FastPairCacheManager.java
index b840091..c6134f5 100644
--- a/nearby/service/java/com/android/server/nearby/fastpair/cache/FastPairCacheManager.java
+++ b/nearby/service/java/com/android/server/nearby/fastpair/cache/FastPairCacheManager.java
@@ -64,16 +64,6 @@
     }
 
     /**
-     * Checks if the entry can be auto deleted from the cache
-     */
-    public boolean isDeletable(Cache.ServerResponseDbItem entry) {
-        if (!entry.getExpirable()) {
-            return false;
-        }
-        return true;
-    }
-
-    /**
      * Save discovery item into database. Discovery item is item that discovered through Ble before
      * pairing success.
      */
diff --git a/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/DiscoveryItemTest.java b/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/DiscoveryItemTest.java
index 1aaed5d..5d4ea22 100644
--- a/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/DiscoveryItemTest.java
+++ b/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/DiscoveryItemTest.java
@@ -33,6 +33,8 @@
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import service.proto.Cache;
+
 /** Unit tests for {@link DiscoveryItem} */
 public class DiscoveryItemTest {
     private static final String DEFAULT_MAC_ADDRESS = "00:11:22:33:44:55";
@@ -45,6 +47,7 @@
             + "package=com.google.android.gms;"
             + "component=com.google.android.gms/"
             + ".nearby.discovery.service.DiscoveryService;end";
+    private static final String DISPLAY_URL = "DISPLAY_URL";
     private static final String TRIGGER_ID = "trigger.id";
     private static final String FAST_PAIR_ID = "id";
     private static final int RSSI = -80;
@@ -72,6 +75,7 @@
     public void testMultipleFields() {
         assertThat(mDiscoveryItem.getId()).isEqualTo(FAST_PAIR_ID);
         assertThat(mDiscoveryItem.getDescription()).isEqualTo(DEFAULT_DESCRIPITON);
+        assertThat(mDiscoveryItem.getDisplayUrl()).isEqualTo(DISPLAY_URL);
         assertThat(mDiscoveryItem.getTriggerId()).isEqualTo(TRIGGER_ID);
         assertThat(mDiscoveryItem.getMacAddress()).isEqualTo(DEFAULT_MAC_ADDRESS);
         assertThat(
@@ -82,10 +86,29 @@
         assertThat(mDiscoveryItem.getAppName()).isEqualTo(APP_NAME);
         assertThat(mDiscoveryItem.getRssi()).isEqualTo(RSSI);
         assertThat(mDiscoveryItem.getTxPower()).isEqualTo(TX_POWER);
+        assertThat(mDiscoveryItem.getFastPairInformation()).isNull();
+        assertThat(mDiscoveryItem.getFastPairSecretKey()).isNull();
+        assertThat(mDiscoveryItem.getIcon()).isNull();
+        assertThat(mDiscoveryItem.getIconFifeUrl()).isNotNull();
+        assertThat(mDiscoveryItem.getState()).isNotNull();
+        assertThat(mDiscoveryItem.getTitle()).isNotNull();
+        assertThat(mDiscoveryItem.isApp()).isFalse();
+        assertThat(mDiscoveryItem.isDeletable(
+                100000L, 0L)).isTrue();
+        assertThat(mDiscoveryItem.isDeviceType(Cache.NearbyType.NEARBY_CHROMECAST)).isTrue();
+        assertThat(mDiscoveryItem.isExpired(
+                100000L, 0L)).isTrue();
+        assertThat(mDiscoveryItem.isFastPair()).isTrue();
+        assertThat(mDiscoveryItem.isPendingAppInstallValid(5)).isTrue();
+        assertThat(mDiscoveryItem.isPendingAppInstallValid(5,
+                FakeDiscoveryItems.newFastPairDeviceStoredItem(FAST_PAIR_ID,  null,
+                TRIGGER_ID,  DEFAULT_MAC_ADDRESS,  "", RSSI, TX_POWER))).isTrue();
+        assertThat(mDiscoveryItem.isTypeEnabled(Cache.NearbyType.NEARBY_CHROMECAST)).isTrue();
+        assertThat(mDiscoveryItem.toString()).isNotNull();
     }
 
     @Test
-    public void isMute() {
+    public void isMuted() {
         assertThat(mDiscoveryItem.isMuted()).isFalse();
     }
 
@@ -94,6 +117,7 @@
         assertThat(mDiscoveryItem.isReadyForDisplay()).isFalse();
 
         // Null description should not show up.
+        mDiscoveryItem.setStoredItemForTest(DiscoveryItem.newStoredDiscoveryItem());
         mDiscoveryItem.setStoredItemForTest(
                 FakeDiscoveryItems.newFastPairDeviceStoredItem(FAST_PAIR_ID,  null,
                         TRIGGER_ID,  DEFAULT_MAC_ADDRESS,  "", RSSI, TX_POWER));
@@ -177,6 +201,14 @@
     }
 
     @Test
+    public void testCompareTo() {
+        DiscoveryItem fastPairItem =
+                FakeDiscoveryItems.newFastPairDiscoveryItem(mLocatorContextWrapper);
+        assertThat(mDiscoveryItem.compareTo(fastPairItem)).isEqualTo(0);
+    }
+
+
+    @Test
     public void testCopyOfStoredItem() {
         DiscoveryItem fastPairItem =
                 FakeDiscoveryItems.newFastPairDiscoveryItem(mLocatorContextWrapper);
diff --git a/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairCacheManagerTest.java b/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairCacheManagerTest.java
index adae97d..0f6fb19 100644
--- a/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairCacheManagerTest.java
+++ b/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairCacheManagerTest.java
@@ -20,6 +20,7 @@
 
 import static org.mockito.Mockito.when;
 
+import android.bluetooth.le.ScanResult;
 import android.content.Context;
 
 import androidx.test.core.app.ApplicationProvider;
@@ -43,6 +44,7 @@
     private static final ByteString ACCOUNT_KEY = ByteString.copyFromUtf8("axgs");
     private static final String MAC_ADDRESS_B = "00:11:22:44";
     private static final ByteString ACCOUNT_KEY_B = ByteString.copyFromUtf8("axgb");
+    private static final String ITEM_ID = "ITEM_ID";
 
     @Mock
     DiscoveryItem mDiscoveryItem;
@@ -50,6 +52,10 @@
     DiscoveryItem mDiscoveryItem2;
     @Mock
     Cache.StoredFastPairItem mStoredFastPairItem;
+    @Mock
+    ScanResult mScanResult;
+
+    Context mContext;
     Cache.StoredDiscoveryItem mStoredDiscoveryItem = Cache.StoredDiscoveryItem.newBuilder()
             .setTriggerId(MODEL_ID)
             .setAppName(APP_NAME).build();
@@ -60,12 +66,12 @@
     @Before
     public void setup() {
         MockitoAnnotations.initMocks(this);
+        mContext = ApplicationProvider.getApplicationContext();
     }
 
     @Test
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void notSaveRetrieveInfo() {
-        Context mContext = ApplicationProvider.getApplicationContext();
         when(mDiscoveryItem.getCopyOfStoredItem()).thenReturn(mStoredDiscoveryItem);
         when(mDiscoveryItem.getTriggerId()).thenReturn(MODEL_ID);
 
@@ -78,7 +84,6 @@
     @Test
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void saveRetrieveInfo() {
-        Context mContext = ApplicationProvider.getApplicationContext();
         when(mDiscoveryItem.getCopyOfStoredItem()).thenReturn(mStoredDiscoveryItem);
         when(mDiscoveryItem.getTriggerId()).thenReturn(MODEL_ID);
 
@@ -91,7 +96,6 @@
     @Test
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void getAllInfo() {
-        Context mContext = ApplicationProvider.getApplicationContext();
         when(mDiscoveryItem.getCopyOfStoredItem()).thenReturn(mStoredDiscoveryItem);
         when(mDiscoveryItem.getTriggerId()).thenReturn(MODEL_ID);
         when(mDiscoveryItem2.getCopyOfStoredItem()).thenReturn(mStoredDiscoveryItem2);
@@ -105,12 +109,13 @@
         fastPairCacheManager.saveDiscoveryItem(mDiscoveryItem2);
 
         assertThat(fastPairCacheManager.getAllSavedStoreDiscoveryItem()).hasSize(3);
+
+        fastPairCacheManager.cleanUp();
     }
 
     @Test
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void saveRetrieveInfoStoredFastPairItem() {
-        Context mContext = ApplicationProvider.getApplicationContext();
         Cache.StoredFastPairItem storedFastPairItem = Cache.StoredFastPairItem.newBuilder()
                 .setMacAddress(MAC_ADDRESS)
                 .setAccountKey(ACCOUNT_KEY)
@@ -128,7 +133,6 @@
     @Test
     @SdkSuppress(minSdkVersion = 32, codeName = "T")
     public void checkGetAllFastPairItems() {
-        Context mContext = ApplicationProvider.getApplicationContext();
         Cache.StoredFastPairItem storedFastPairItem = Cache.StoredFastPairItem.newBuilder()
                 .setMacAddress(MAC_ADDRESS)
                 .setAccountKey(ACCOUNT_KEY)
@@ -149,5 +153,15 @@
 
         assertThat(fastPairCacheManager.getAllSavedStoredFastPairItem().size())
                 .isEqualTo(1);
+
+        fastPairCacheManager.cleanUp();
+    }
+
+    @Test
+    @SdkSuppress(minSdkVersion = 32, codeName = "T")
+    public void getDeviceFromScanResult_notCrash() {
+        FastPairCacheManager fastPairCacheManager = new FastPairCacheManager(mContext);
+        fastPairCacheManager.getDeviceFromScanResult(mScanResult);
+
     }
 }
diff --git a/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairDbHelperTest.java b/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairDbHelperTest.java
new file mode 100644
index 0000000..c5428f5
--- /dev/null
+++ b/nearby/tests/unit/src/com/android/server/nearby/fastpair/cache/FastPairDbHelperTest.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2021 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.server.nearby.fastpair.cache;
+
+import static org.junit.Assert.assertThrows;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteException;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.MockitoAnnotations;
+
+public class FastPairDbHelperTest {
+
+    Context mContext;
+    FastPairDbHelper mFastPairDbHelper;
+
+    @Before
+    public void setup() {
+        MockitoAnnotations.initMocks(this);
+        mContext = InstrumentationRegistry.getInstrumentation().getContext();
+        mFastPairDbHelper = new FastPairDbHelper(mContext);
+    }
+
+    @After
+    public void teardown() {
+        mFastPairDbHelper.close();
+    }
+
+    @Test
+    public void testUpgrade_notCrash() {
+        mFastPairDbHelper
+                .onUpgrade(mFastPairDbHelper.getWritableDatabase(), 1, 2);
+    }
+
+    @Test
+    public void testDowngrade_throwsException()  {
+        assertThrows(
+                SQLiteException.class,
+                () -> mFastPairDbHelper.onDowngrade(
+                        mFastPairDbHelper.getWritableDatabase(), 2, 1));
+    }
+}
diff --git a/nearby/tests/unit/src/com/android/server/nearby/fastpair/testing/FakeDiscoveryItems.java b/nearby/tests/unit/src/com/android/server/nearby/fastpair/testing/FakeDiscoveryItems.java
index e289543..cdec04d 100644
--- a/nearby/tests/unit/src/com/android/server/nearby/fastpair/testing/FakeDiscoveryItems.java
+++ b/nearby/tests/unit/src/com/android/server/nearby/fastpair/testing/FakeDiscoveryItems.java
@@ -31,6 +31,7 @@
                     + "package=com.google.android.gms;"
                     + "component=com.google.android.gms/"
                     + ".nearby.discovery.service.DiscoveryService;end";
+    private static final String DISPLAY_URL = "DISPLAY_URL";
     private static final String TRIGGER_ID = "trigger.id";
     private static final String FAST_PAIR_ID = "id";
     private static final int RSSI = -80;
@@ -56,6 +57,7 @@
         item.setAppName(APP_NAME);
         item.setRssi(RSSI);
         item.setTxPower(TX_POWER);
+        item.setDisplayUrl(DISPLAY_URL);
         return item.build();
     }