diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index eb91b81..8b4ef03 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -18,7 +18,7 @@
     package="com.android.messaging"
     android:installLocation="internalOnly">
 
-    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="28" />
+    <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="24" />
 
     <!-- Application holds CPU wakelock while working in background -->
     <uses-permission android:name="android.permission.WAKE_LOCK" />
diff --git a/tests/AndroidManifest.xml b/tests/AndroidManifest.xml
index 3ad7d8e..867d8e1 100644
--- a/tests/AndroidManifest.xml
+++ b/tests/AndroidManifest.xml
@@ -17,7 +17,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.messaging.test" >
 
-    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="28"/>
+    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="19"/>
 
     <application android:label="Messaging Tests" >
         <uses-library android:name="android.test.runner" />
diff --git a/tests/src/com/android/messaging/datamodel/ParticipantRefreshTest.java b/tests/src/com/android/messaging/datamodel/ParticipantRefreshTest.java
index d585e10..cd1d6c7 100644
--- a/tests/src/com/android/messaging/datamodel/ParticipantRefreshTest.java
+++ b/tests/src/com/android/messaging/datamodel/ParticipantRefreshTest.java
@@ -30,11 +30,9 @@
 import com.android.messaging.datamodel.DatabaseHelper.ParticipantColumns;
 import com.android.messaging.datamodel.data.ParticipantData;
 import com.android.messaging.datamodel.data.ParticipantData.ParticipantsQuery;
-import com.android.messaging.ui.UIIntents;
 import com.android.messaging.util.ContactUtil;
 
 import org.junit.Assert;
-import org.mockito.Mock;
 
 /**
  * Utility class for testing ParticipantRefresh class for different scenarios.
@@ -43,8 +41,6 @@
 public class ParticipantRefreshTest extends BugleTestCase {
     private FakeContext mContext;
     FakeFactory mFakeFactory;
-    @Mock protected UIIntents mMockUIIntents;
-    protected FakeDataModel mFakeDataModel;
 
     @Override
     public void setUp() throws Exception {
@@ -56,10 +52,9 @@
         provider.attachInfo(mContext, null);
         mContext.addContentProvider(MessagingContentProvider.AUTHORITY, provider);
 
-        mFakeDataModel = new FakeDataModel(mContext);
+        final FakeDataModel fakeDataModel = new FakeDataModel(mContext);
         mFakeFactory = FakeFactory.registerWithFakeContext(getTestContext(), mContext)
-                .withDataModel(mFakeDataModel)
-                .withUIIntents(mMockUIIntents);
+                .withDataModel(fakeDataModel);
     }
 
     /**
@@ -184,7 +179,7 @@
         });
 
         ParticipantRefresh.refreshParticipants(ParticipantRefresh.REFRESH_MODE_INCREMENTAL);
-        verifyParticipant("650-123-1233", 1, "John", "content://photo/john");
+        verifyParticipant("650-123-1233", 1, "Joh", "content://photo/joh");
     }
 
     /**
@@ -211,7 +206,8 @@
         });
 
         ParticipantRefresh.refreshParticipants(ParticipantRefresh.REFRESH_MODE_INCREMENTAL);
-        verifyParticipant("650-123-1233", 1, "John", "content://photo/john");
+        verifyParticipant("650-123-1233", ParticipantData.PARTICIPANT_CONTACT_ID_NOT_FOUND,
+                null, null);
     }
 
     /**
@@ -253,7 +249,7 @@
         });
 
         ParticipantRefresh.refreshParticipants(ParticipantRefresh.REFRESH_MODE_FULL);
-        verifyParticipant("650-123-1233", 1, "John", "content://photo/john");
+        verifyParticipant("650-123-1233", 2, "Joe", "content://photo/joe");
     }
 
     /**
@@ -274,7 +270,7 @@
      * Verify that refresh take first contact in case current contact_id no longer matches.
      */
     public void testFullRefreshResolvedBeforeButNotFoundNow() {
-        addParticipant("650-123-1233", 1, "Joh", "content://photo/joh");
+        addParticipant("650-123-1233", 3, "Joh", "content://photo/joh");
         addPhoneLookup("650-123-1233", new Object[][] {});
 
         ParticipantRefresh.refreshParticipants(ParticipantRefresh.REFRESH_MODE_FULL);
diff --git a/tests/src/com/android/messaging/datamodel/action/GetOrCreateConversationActionTest.java b/tests/src/com/android/messaging/datamodel/action/GetOrCreateConversationActionTest.java
index 6e7b40d..b05b022 100644
--- a/tests/src/com/android/messaging/datamodel/action/GetOrCreateConversationActionTest.java
+++ b/tests/src/com/android/messaging/datamodel/action/GetOrCreateConversationActionTest.java
@@ -67,10 +67,8 @@
         final long threadId = MmsUtils.getOrCreateThreadId(mContext, recipients);
         assertEquals(TestDataFactory.SMS_MMS_THREAD_ID_CURSOR_VALUE, threadId);
 
-        // TestDataFactory creates NUM_TEST_CONVERSATIONS conversations. blank
-        // conversation would be the next conversation.
         final String blankId = BugleDatabaseOperations.getExistingConversation(db, threadId, false);
-        assertEquals(TestDataFactory.NUM_TEST_CONVERSATIONS+1, Integer.parseInt((String)blankId));
+        assertNull("Conversation already exists", blankId);
 
         ArrayList<StubActionServiceCallLog> calls = mService.getCalls();
 
diff --git a/tests/src/com/android/messaging/ui/conversation/ConversationFragmentTest.java b/tests/src/com/android/messaging/ui/conversation/ConversationFragmentTest.java
index aee2d84..c92fbf6 100644
--- a/tests/src/com/android/messaging/ui/conversation/ConversationFragmentTest.java
+++ b/tests/src/com/android/messaging/ui/conversation/ConversationFragmentTest.java
@@ -91,9 +91,6 @@
         Mockito.doReturn(mockDraftMessageData)
             .when(mockDataModel)
             .createDraftMessageData(Mockito.anyString());
-        Mockito.doReturn(mockDraftMessageData)
-            .when(mockDataModel)
-            .createDraftMessageData(null);
         Mockito.when(mockDataModel.createConversationData(
                 Matchers.any(Activity.class),
                 Matchers.any(ConversationDataListener.class),