tests/tests/widget/src/android/widget/cts/CursorAdapterTest.java - platform/cts - Git at Google

 /*
  * Copyright (C) 2008 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 android.widget.cts;

 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;

 import android.content.Context;
 import android.content.res.Resources.Theme;
 import android.database.ContentObserver;
 import android.database.Cursor;
 import android.database.DataSetObserver;
 import android.database.sqlite.SQLiteDatabase;
 import android.os.Looper;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.CursorAdapter;
 import android.widget.Filter;
 import android.widget.FilterQueryProvider;
 import android.widget.TextView;

 import androidx.test.InstrumentationRegistry;
 import androidx.test.annotation.UiThreadTest;
 import androidx.test.filters.MediumTest;
 import androidx.test.runner.AndroidJUnit4;

 import com.android.compatibility.common.util.PollingCheck;
 import com.android.compatibility.common.util.TestThread;

 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;

 import java.io.File;

 /**
  * Test {@link CursorAdapter}.
  */
 @MediumTest
 @RunWith(AndroidJUnit4.class)
 public class CursorAdapterTest {
     private static final long TEST_TIME_OUT = 5000;
     private static final int NUMBER_INDEX = 1;
     private static final String FIRST_NUMBER = "123";
     private static final String SECOND_NUMBER = "5555";
     private static final int FIRST_ITEM_ID = 1;
     private static final int SECOND_ITEM_ID = 2;
     private static final String[] NUMBER_PROJECTION = new String[] {
         "_id",             // 0
         "number"           // 1
     };
     private SQLiteDatabase mDatabase;
     private File mDatabaseFile;
     private Cursor mCursor;
     private ViewGroup mParent;
     private MockCursorAdapter mMockCursorAdapter;
     private Context mContext;

     @Before
     public void setup() {
         mContext = InstrumentationRegistry.getTargetContext();
         File dbDir = mContext.getDir("tests", Context.MODE_PRIVATE);
         mDatabaseFile = new File(dbDir, "database_test.db");
         if (mDatabaseFile.exists()) {
             mDatabaseFile.delete();
         }
         mDatabase = SQLiteDatabase.openOrCreateDatabase(mDatabaseFile.getPath(), null);
         assertNotNull(mDatabase);
         mDatabase.execSQL("CREATE TABLE test (_id INTEGER PRIMARY KEY, number TEXT);");
         mDatabase.execSQL("INSERT INTO test (number) VALUES ('" + FIRST_NUMBER + "');");
         mDatabase.execSQL("INSERT INTO test (number) VALUES ('" + SECOND_NUMBER + "');");
         mCursor = mDatabase.query("test", NUMBER_PROJECTION, null, null, null, null, null);
         assertNotNull(mCursor);

         final LayoutInflater inflater = LayoutInflater.from(mContext);
         mParent = (ViewGroup) inflater.inflate(R.layout.cursoradapter_host, null);
         assertNotNull(mParent);
     }

     @After
     public void teardown() {
         if (null != mCursor) {
             mCursor.close();
             mCursor = null;
         }
         mDatabase.close();
         mDatabaseFile.delete();
     }

     @UiThreadTest
     @Test
     public void testConstructor() {
         new MockCursorAdapter(mContext, mCursor);

         new MockCursorAdapter(null, null);

         new MockCursorAdapter(mContext, mCursor, true);

         new MockCursorAdapter(null, null, false);
     }

     @UiThreadTest
     @Test
     public void testInit() {
         MockCursorAdapter cursorAdapter = new MockCursorAdapter(null, null, false);
         cursorAdapter.init(null, null, false);
         assertNull(cursorAdapter.getContext());
         assertNull(cursorAdapter.getCursor());
         assertFalse(cursorAdapter.getAutoRequery());
         assertFalse(cursorAdapter.getDataValid());
         assertEquals(-1, cursorAdapter.getRowIDColumn());

         // add context
         cursorAdapter.init(mContext, null, false);
         assertSame(mContext, cursorAdapter.getContext());
         assertNull(cursorAdapter.getCursor());
         assertFalse(cursorAdapter.getAutoRequery());
         assertFalse(cursorAdapter.getDataValid());
         assertEquals(-1, cursorAdapter.getRowIDColumn());

         // add autoRequery
         cursorAdapter.init(mContext, null, true);
         assertSame(mContext, cursorAdapter.getContext());
         assertNull(cursorAdapter.getCursor());
         assertTrue(cursorAdapter.getAutoRequery());
         assertFalse(cursorAdapter.getDataValid());
         assertEquals(-1, cursorAdapter.getRowIDColumn());

         // add cursor
         cursorAdapter.init(mContext, mCursor, true);
         assertSame(mContext, cursorAdapter.getContext());
         assertSame(mCursor, cursorAdapter.getCursor());
         assertTrue(cursorAdapter.getAutoRequery());
         assertTrue(cursorAdapter.getDataValid());
         assertEquals(0, cursorAdapter.getRowIDColumn());
         try {
             mCursor.registerContentObserver(cursorAdapter.getContentObserver());
             fail("the ContentObserver has not been registered");
         } catch (IllegalStateException e) {
         }
         try {
             mCursor.registerDataSetObserver(cursorAdapter.getDataSetObserver());
             fail("the DataSetObserver has not been registered");
         } catch (IllegalStateException e) {
         }
     }

     @UiThreadTest
     @Test
     public void testGetCount() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         assertEquals(0, cursorAdapter.getCount());

         cursorAdapter.changeCursor(mCursor);
         assertEquals(mCursor.getCount(), cursorAdapter.getCount());
     }

     @UiThreadTest
     @Test
     public void testAccessCursor() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         assertNull(cursorAdapter.getCursor());

         cursorAdapter.changeCursor(mCursor);
         assertSame(mCursor, cursorAdapter.getCursor());

         cursorAdapter.changeCursor(null);
         assertNull(cursorAdapter.getCursor());
     }

     @UiThreadTest
     @Test
     public void testConvertToString() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         assertEquals("", cursorAdapter.convertToString(null));

         assertEquals(mCursor.toString(), cursorAdapter.convertToString(mCursor));
     }

     @UiThreadTest
     @Test
     public void testHasStableIds() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         assertTrue(cursorAdapter.hasStableIds());

         cursorAdapter  = new MockCursorAdapter(null, null);
         assertTrue(cursorAdapter.hasStableIds());
     }

     @UiThreadTest
     @Test
     public void testGetView() {
         TextView textView = new TextView(mContext);
         textView.setText("getView test");

         MockCursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         // null cursor
         assertFalse(cursorAdapter.getDataValid());
         try {
             cursorAdapter.getView(0, textView, mParent);
             fail("does not throw IllegalStateException when cursor is invalid");
         } catch (IllegalStateException e) {
         }

         cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         try {
             cursorAdapter.getView(100, textView, mParent);
             fail("does not throw IllegalStateException when position is out of bound");
         } catch (IllegalStateException e) {
         }

         // null convertView
         TextView retView = (TextView) cursorAdapter.getView(0, null, mParent);
         assertNotNull(retView);
         assertEquals(FIRST_NUMBER, retView.getText().toString());

         // convertView is not null
         retView = (TextView) cursorAdapter.getView(1, textView, mParent);
         assertNotNull(retView);
         assertEquals(SECOND_NUMBER, retView.getText().toString());
     }

     @UiThreadTest
     @Test
     public void testNewDropDownView() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         // null cursor
         assertNull(cursorAdapter.newDropDownView(mContext, null, mParent));

         TextView textView = (TextView) cursorAdapter.newDropDownView(mContext, mCursor, mParent);
         assertEquals(FIRST_NUMBER, textView.getText().toString());
     }

     @UiThreadTest
     @Test
     public void testGetDropDownView() {
         MockCursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         // null cursor
         assertFalse(cursorAdapter.getDataValid());
         TextView textView = new TextView(mContext);
         textView.setText("getDropDownView test");

         assertNull(cursorAdapter.getDropDownView(0, textView, mParent));

         // null convertView
         cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         TextView retView = (TextView) cursorAdapter.getDropDownView(0, null, mParent);
         assertNotNull(retView);
         assertEquals(FIRST_NUMBER, retView.getText().toString());

         // convertView is not null
         retView = (TextView) cursorAdapter.getDropDownView(1, textView, mParent);
         assertNotNull(retView);
         assertEquals(SECOND_NUMBER, retView.getText().toString());
     }

     @UiThreadTest
     @Test
     public void testAccessDropDownViewTheme() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         Theme theme = mContext.getResources().newTheme();
         cursorAdapter.setDropDownViewTheme(theme);
         assertSame(theme, cursorAdapter.getDropDownViewTheme());
     }

     @UiThreadTest
     @Test
     public void testGetFilter() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         Filter filter = cursorAdapter.getFilter();
         assertNotNull(filter);
     }

     @UiThreadTest
     @Test
     public void testGetItem() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         // cursor is null
         assertNull(cursorAdapter.getItem(0));

         cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         Cursor c = (Cursor) cursorAdapter.getItem(0);
         assertNotNull(c);
         assertEquals(0, c.getPosition());
         assertEquals(FIRST_NUMBER, c.getString(NUMBER_INDEX));

         c = (Cursor) cursorAdapter.getItem(1);
         assertNotNull(c);
         assertEquals(1, c.getPosition());
         assertEquals(SECOND_NUMBER, c.getString(NUMBER_INDEX));
     }

     @UiThreadTest
     @Test
     public void testGetItemId() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
         // cursor is null
         assertEquals(0, cursorAdapter.getItemId(0));

         cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         assertEquals(FIRST_ITEM_ID, cursorAdapter.getItemId(0));

         assertEquals(SECOND_ITEM_ID, cursorAdapter.getItemId(1));

         // position is out of bound
         assertEquals(0, cursorAdapter.getItemId(2));
     }

     @UiThreadTest
     @Test
     public void testAccessFilterQueryProvider() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         FilterQueryProvider filterProvider = new MockFilterQueryProvider();
         assertNotNull(filterProvider);

         assertNull(cursorAdapter.getFilterQueryProvider());

         cursorAdapter.setFilterQueryProvider(filterProvider);
         assertSame(filterProvider, cursorAdapter.getFilterQueryProvider());
     }

     @UiThreadTest
     @Test
     public void testRunQueryOnBackgroundThread() {
         CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
         final String constraint = "constraint";

         // FilterQueryProvider is null, return mCursor
         assertSame(mCursor, cursorAdapter.runQueryOnBackgroundThread(constraint));

         FilterQueryProvider filterProvider = new MockFilterQueryProvider();
         assertNotNull(filterProvider);
         cursorAdapter.setFilterQueryProvider(filterProvider);
         assertNull(cursorAdapter.runQueryOnBackgroundThread(constraint));
     }

     @Test
     public void testOnContentChanged() throws Throwable {
         new TestThread(() -> {
             Looper.prepare();
             mMockCursorAdapter = new MockCursorAdapter(mContext, mCursor);
         }).runTest(TEST_TIME_OUT);
         assertFalse(mMockCursorAdapter.hasContentChanged());
         // insert a new row
         mDatabase.execSQL("INSERT INTO test (number) VALUES ('" + FIRST_NUMBER + "');");
         new PollingCheck(TEST_TIME_OUT) {
             @Override
             protected boolean check() {
                 return mMockCursorAdapter.hasContentChanged();
             }
         };
     }

     private final class MockCursorAdapter extends CursorAdapter {
         private Context mContext;
         private boolean mAutoRequery;

         private boolean mContentChanged = false;

         public MockCursorAdapter(Context context, Cursor c) {
             super(context, c);

             mContext = context;
             mAutoRequery = false;
         }

         public MockCursorAdapter(Context context, Cursor c, boolean autoRequery) {
             super(context, c, autoRequery);

             mContext = context;
             mAutoRequery = autoRequery;
         }

         public Context getContext() {
             return mContext;
         }

         public boolean getAutoRequery() {
             return mAutoRequery;
         }

         public boolean getDataValid() {
             return mDataValid;
         }

         public int getRowIDColumn() {
             return mRowIDColumn;
         }

         public ContentObserver getContentObserver() {
             return mChangeObserver;
         }

         public DataSetObserver getDataSetObserver() {
             return mDataSetObserver;
         }

         @Override
         public void init(Context context, Cursor c, boolean autoRequery) {
             super.init(context, c, autoRequery);

             mContext = context;
             mAutoRequery = autoRequery;
         }

         @Override
         public void bindView(View view, Context context, Cursor cursor) {
             if (null == context || null == cursor || null == view) {
                 return;
             }

             if (view instanceof TextView) {
                 String number = cursor.getString(NUMBER_INDEX);
                 TextView textView = (TextView) view;
                 textView.setText(number);
             }
         }

         @Override
         public View newView(Context context, Cursor cursor, ViewGroup parent) {
             if (null == context || null == cursor || null == parent) {
                 return null;
             }

             if (cursor.moveToFirst()) {
                 String number = cursor.getString(NUMBER_INDEX);
                 TextView textView = new TextView(context);
                 textView.setText(number);
                 return textView;
             }
             return null;
         }

         @Override
         protected void onContentChanged() {
             super.onContentChanged();
             mContentChanged = true;
         }

         public boolean hasContentChanged() {
             return mContentChanged;
         }
     }

     private final class MockFilterQueryProvider implements FilterQueryProvider {
         public Cursor runQuery(CharSequence constraint) {
             return null;
         }
     }
 }
	/*
	* Copyright (C) 2008 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 android.widget.cts;

	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertFalse;
	import static org.junit.Assert.assertNotNull;
	import static org.junit.Assert.assertNull;
	import static org.junit.Assert.assertSame;
	import static org.junit.Assert.assertTrue;
	import static org.junit.Assert.fail;

	import android.content.Context;
	import android.content.res.Resources.Theme;
	import android.database.ContentObserver;
	import android.database.Cursor;
	import android.database.DataSetObserver;
	import android.database.sqlite.SQLiteDatabase;
	import android.os.Looper;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.CursorAdapter;
	import android.widget.Filter;
	import android.widget.FilterQueryProvider;
	import android.widget.TextView;

	import androidx.test.InstrumentationRegistry;
	import androidx.test.annotation.UiThreadTest;
	import androidx.test.filters.MediumTest;
	import androidx.test.runner.AndroidJUnit4;

	import com.android.compatibility.common.util.PollingCheck;
	import com.android.compatibility.common.util.TestThread;

	import org.junit.After;
	import org.junit.Before;
	import org.junit.Test;
	import org.junit.runner.RunWith;

	import java.io.File;

	/**
	* Test {@link CursorAdapter}.
	*/
	@MediumTest
	@RunWith(AndroidJUnit4.class)
	public class CursorAdapterTest {
	private static final long TEST_TIME_OUT = 5000;
	private static final int NUMBER_INDEX = 1;
	private static final String FIRST_NUMBER = "123";
	private static final String SECOND_NUMBER = "5555";
	private static final int FIRST_ITEM_ID = 1;
	private static final int SECOND_ITEM_ID = 2;
	private static final String[] NUMBER_PROJECTION = new String[] {
	"_id", // 0
	"number" // 1
	};
	private SQLiteDatabase mDatabase;
	private File mDatabaseFile;
	private Cursor mCursor;
	private ViewGroup mParent;
	private MockCursorAdapter mMockCursorAdapter;
	private Context mContext;

	@Before
	public void setup() {
	mContext = InstrumentationRegistry.getTargetContext();
	File dbDir = mContext.getDir("tests", Context.MODE_PRIVATE);
	mDatabaseFile = new File(dbDir, "database_test.db");
	if (mDatabaseFile.exists()) {
	mDatabaseFile.delete();
	}
	mDatabase = SQLiteDatabase.openOrCreateDatabase(mDatabaseFile.getPath(), null);
	assertNotNull(mDatabase);
	mDatabase.execSQL("CREATE TABLE test (_id INTEGER PRIMARY KEY, number TEXT);");
	mDatabase.execSQL("INSERT INTO test (number) VALUES ('" + FIRST_NUMBER + "');");
	mDatabase.execSQL("INSERT INTO test (number) VALUES ('" + SECOND_NUMBER + "');");
	mCursor = mDatabase.query("test", NUMBER_PROJECTION, null, null, null, null, null);
	assertNotNull(mCursor);

	final LayoutInflater inflater = LayoutInflater.from(mContext);
	mParent = (ViewGroup) inflater.inflate(R.layout.cursoradapter_host, null);
	assertNotNull(mParent);
	}

	@After
	public void teardown() {
	if (null != mCursor) {
	mCursor.close();
	mCursor = null;
	}
	mDatabase.close();
	mDatabaseFile.delete();
	}

	@UiThreadTest
	@Test
	public void testConstructor() {
	new MockCursorAdapter(mContext, mCursor);

	new MockCursorAdapter(null, null);

	new MockCursorAdapter(mContext, mCursor, true);

	new MockCursorAdapter(null, null, false);
	}

	@UiThreadTest
	@Test
	public void testInit() {
	MockCursorAdapter cursorAdapter = new MockCursorAdapter(null, null, false);
	cursorAdapter.init(null, null, false);
	assertNull(cursorAdapter.getContext());
	assertNull(cursorAdapter.getCursor());
	assertFalse(cursorAdapter.getAutoRequery());
	assertFalse(cursorAdapter.getDataValid());
	assertEquals(-1, cursorAdapter.getRowIDColumn());

	// add context
	cursorAdapter.init(mContext, null, false);
	assertSame(mContext, cursorAdapter.getContext());
	assertNull(cursorAdapter.getCursor());
	assertFalse(cursorAdapter.getAutoRequery());
	assertFalse(cursorAdapter.getDataValid());
	assertEquals(-1, cursorAdapter.getRowIDColumn());

	// add autoRequery
	cursorAdapter.init(mContext, null, true);
	assertSame(mContext, cursorAdapter.getContext());
	assertNull(cursorAdapter.getCursor());
	assertTrue(cursorAdapter.getAutoRequery());
	assertFalse(cursorAdapter.getDataValid());
	assertEquals(-1, cursorAdapter.getRowIDColumn());

	// add cursor
	cursorAdapter.init(mContext, mCursor, true);
	assertSame(mContext, cursorAdapter.getContext());
	assertSame(mCursor, cursorAdapter.getCursor());
	assertTrue(cursorAdapter.getAutoRequery());
	assertTrue(cursorAdapter.getDataValid());
	assertEquals(0, cursorAdapter.getRowIDColumn());
	try {
	mCursor.registerContentObserver(cursorAdapter.getContentObserver());
	fail("the ContentObserver has not been registered");
	} catch (IllegalStateException e) {
	}
	try {
	mCursor.registerDataSetObserver(cursorAdapter.getDataSetObserver());
	fail("the DataSetObserver has not been registered");
	} catch (IllegalStateException e) {
	}
	}

	@UiThreadTest
	@Test
	public void testGetCount() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	assertEquals(0, cursorAdapter.getCount());

	cursorAdapter.changeCursor(mCursor);
	assertEquals(mCursor.getCount(), cursorAdapter.getCount());
	}

	@UiThreadTest
	@Test
	public void testAccessCursor() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	assertNull(cursorAdapter.getCursor());

	cursorAdapter.changeCursor(mCursor);
	assertSame(mCursor, cursorAdapter.getCursor());

	cursorAdapter.changeCursor(null);
	assertNull(cursorAdapter.getCursor());
	}

	@UiThreadTest
	@Test
	public void testConvertToString() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	assertEquals("", cursorAdapter.convertToString(null));

	assertEquals(mCursor.toString(), cursorAdapter.convertToString(mCursor));
	}

	@UiThreadTest
	@Test
	public void testHasStableIds() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	assertTrue(cursorAdapter.hasStableIds());

	cursorAdapter = new MockCursorAdapter(null, null);
	assertTrue(cursorAdapter.hasStableIds());
	}

	@UiThreadTest
	@Test
	public void testGetView() {
	TextView textView = new TextView(mContext);
	textView.setText("getView test");

	MockCursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	// null cursor
	assertFalse(cursorAdapter.getDataValid());
	try {
	cursorAdapter.getView(0, textView, mParent);
	fail("does not throw IllegalStateException when cursor is invalid");
	} catch (IllegalStateException e) {
	}

	cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	try {
	cursorAdapter.getView(100, textView, mParent);
	fail("does not throw IllegalStateException when position is out of bound");
	} catch (IllegalStateException e) {
	}

	// null convertView
	TextView retView = (TextView) cursorAdapter.getView(0, null, mParent);
	assertNotNull(retView);
	assertEquals(FIRST_NUMBER, retView.getText().toString());

	// convertView is not null
	retView = (TextView) cursorAdapter.getView(1, textView, mParent);
	assertNotNull(retView);
	assertEquals(SECOND_NUMBER, retView.getText().toString());
	}

	@UiThreadTest
	@Test
	public void testNewDropDownView() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	// null cursor
	assertNull(cursorAdapter.newDropDownView(mContext, null, mParent));

	TextView textView = (TextView) cursorAdapter.newDropDownView(mContext, mCursor, mParent);
	assertEquals(FIRST_NUMBER, textView.getText().toString());
	}

	@UiThreadTest
	@Test
	public void testGetDropDownView() {
	MockCursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	// null cursor
	assertFalse(cursorAdapter.getDataValid());
	TextView textView = new TextView(mContext);
	textView.setText("getDropDownView test");

	assertNull(cursorAdapter.getDropDownView(0, textView, mParent));

	// null convertView
	cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	TextView retView = (TextView) cursorAdapter.getDropDownView(0, null, mParent);
	assertNotNull(retView);
	assertEquals(FIRST_NUMBER, retView.getText().toString());

	// convertView is not null
	retView = (TextView) cursorAdapter.getDropDownView(1, textView, mParent);
	assertNotNull(retView);
	assertEquals(SECOND_NUMBER, retView.getText().toString());
	}

	@UiThreadTest
	@Test
	public void testAccessDropDownViewTheme() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	Theme theme = mContext.getResources().newTheme();
	cursorAdapter.setDropDownViewTheme(theme);
	assertSame(theme, cursorAdapter.getDropDownViewTheme());
	}

	@UiThreadTest
	@Test
	public void testGetFilter() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	Filter filter = cursorAdapter.getFilter();
	assertNotNull(filter);
	}

	@UiThreadTest
	@Test
	public void testGetItem() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	// cursor is null
	assertNull(cursorAdapter.getItem(0));

	cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	Cursor c = (Cursor) cursorAdapter.getItem(0);
	assertNotNull(c);
	assertEquals(0, c.getPosition());
	assertEquals(FIRST_NUMBER, c.getString(NUMBER_INDEX));

	c = (Cursor) cursorAdapter.getItem(1);
	assertNotNull(c);
	assertEquals(1, c.getPosition());
	assertEquals(SECOND_NUMBER, c.getString(NUMBER_INDEX));
	}

	@UiThreadTest
	@Test
	public void testGetItemId() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, null);
	// cursor is null
	assertEquals(0, cursorAdapter.getItemId(0));

	cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	assertEquals(FIRST_ITEM_ID, cursorAdapter.getItemId(0));

	assertEquals(SECOND_ITEM_ID, cursorAdapter.getItemId(1));

	// position is out of bound
	assertEquals(0, cursorAdapter.getItemId(2));
	}

	@UiThreadTest
	@Test
	public void testAccessFilterQueryProvider() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	FilterQueryProvider filterProvider = new MockFilterQueryProvider();
	assertNotNull(filterProvider);

	assertNull(cursorAdapter.getFilterQueryProvider());

	cursorAdapter.setFilterQueryProvider(filterProvider);
	assertSame(filterProvider, cursorAdapter.getFilterQueryProvider());
	}

	@UiThreadTest
	@Test
	public void testRunQueryOnBackgroundThread() {
	CursorAdapter cursorAdapter = new MockCursorAdapter(mContext, mCursor);
	final String constraint = "constraint";

	// FilterQueryProvider is null, return mCursor
	assertSame(mCursor, cursorAdapter.runQueryOnBackgroundThread(constraint));

	FilterQueryProvider filterProvider = new MockFilterQueryProvider();
	assertNotNull(filterProvider);
	cursorAdapter.setFilterQueryProvider(filterProvider);
	assertNull(cursorAdapter.runQueryOnBackgroundThread(constraint));
	}

	@Test
	public void testOnContentChanged() throws Throwable {
	new TestThread(() -> {
	Looper.prepare();
	mMockCursorAdapter = new MockCursorAdapter(mContext, mCursor);
	}).runTest(TEST_TIME_OUT);
	assertFalse(mMockCursorAdapter.hasContentChanged());
	// insert a new row
	mDatabase.execSQL("INSERT INTO test (number) VALUES ('" + FIRST_NUMBER + "');");
	new PollingCheck(TEST_TIME_OUT) {
	@Override
	protected boolean check() {
	return mMockCursorAdapter.hasContentChanged();
	}
	};
	}

	private final class MockCursorAdapter extends CursorAdapter {
	private Context mContext;
	private boolean mAutoRequery;

	private boolean mContentChanged = false;

	public MockCursorAdapter(Context context, Cursor c) {
	super(context, c);

	mContext = context;
	mAutoRequery = false;
	}

	public MockCursorAdapter(Context context, Cursor c, boolean autoRequery) {
	super(context, c, autoRequery);

	mContext = context;
	mAutoRequery = autoRequery;
	}

	public Context getContext() {
	return mContext;
	}

	public boolean getAutoRequery() {
	return mAutoRequery;
	}

	public boolean getDataValid() {
	return mDataValid;
	}

	public int getRowIDColumn() {
	return mRowIDColumn;
	}

	public ContentObserver getContentObserver() {
	return mChangeObserver;
	}

	public DataSetObserver getDataSetObserver() {
	return mDataSetObserver;
	}

	@Override
	public void init(Context context, Cursor c, boolean autoRequery) {
	super.init(context, c, autoRequery);

	mContext = context;
	mAutoRequery = autoRequery;
	}

	@Override
	public void bindView(View view, Context context, Cursor cursor) {
	if (null == context \|\| null == cursor \|\| null == view) {
	return;
	}

	if (view instanceof TextView) {
	String number = cursor.getString(NUMBER_INDEX);
	TextView textView = (TextView) view;
	textView.setText(number);
	}
	}

	@Override
	public View newView(Context context, Cursor cursor, ViewGroup parent) {
	if (null == context \|\| null == cursor \|\| null == parent) {
	return null;
	}

	if (cursor.moveToFirst()) {
	String number = cursor.getString(NUMBER_INDEX);
	TextView textView = new TextView(context);
	textView.setText(number);
	return textView;
	}
	return null;
	}

	@Override
	protected void onContentChanged() {
	super.onContentChanged();
	mContentChanged = true;
	}

	public boolean hasContentChanged() {
	return mContentChanged;
	}
	}

	private final class MockFilterQueryProvider implements FilterQueryProvider {
	public Cursor runQuery(CharSequence constraint) {
	return null;
	}
	}
	}