Implement database for buffer

app/src/test/java/org/traccar/client/DatabaseHelperTest.java

@@ -0,0 +1,46 @@
+
+package org.traccar.client;
+
+import android.database.sqlite.SQLiteDatabase;
+import android.location.Location;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricGradleTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import java.util.Date;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+@RunWith(RobolectricGradleTestRunner.class)
+@Config(constants = BuildConfig.class, sdk = 21)
+public class DatabaseHelperTest {
+
+    @Test
+    public void test() throws Exception {
+
+        DatabaseHelper databaseHelper = new DatabaseHelper(RuntimeEnvironment.application);
+
+        SQLiteDatabase db = databaseHelper.getWritableDatabase();
+
+        Position position = new Position("123456789012345", new Location("gps"), 0);
+        position.setTime(new Date(0));
+
+        assertNull(databaseHelper.selectPosition(db));
+
+        databaseHelper.insertPosition(db, position);
+
+        position = databaseHelper.selectPosition(db);
+
+        assertNotNull(position);
+
+        databaseHelper.deletePosition(db, position.getId());
+
+        assertNull(databaseHelper.selectPosition(db));
+
+    }
+
+}