Added a unit test to confirm that rolling back transactions works the way we expect it to

tests/src/com/todoroo/astrid/dao/DatabaseDaoTests.java

@@ -0,0 +1,54 @@
+package com.todoroo.astrid.dao;
+
+import android.content.ContentValues;
+
+import com.todoroo.andlib.data.TodorooCursor;
+import com.todoroo.andlib.sql.Query;
+import com.todoroo.astrid.data.Task;
+import com.todoroo.astrid.data.TaskOutstanding;
+import com.todoroo.astrid.test.DatabaseTestCase;
+
+public class DatabaseDaoTests extends DatabaseTestCase {
+
+    private TaskDao dao;
+    private TaskOutstandingDao outstandingDao;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        RemoteModelDao.outstandingEntryFlag = 1;
+    }
+
+    public void testFailedTransactionCreatesNoRows() {
+        dao = new TaskDao() {
+            @Override
+            protected int createOutstandingEntries(long modelId, ContentValues modelSetValues) {
+                super.createOutstandingEntries(modelId, modelSetValues);
+                return -1;
+            }
+        };
+        dao.setDatabase(database);
+
+        outstandingDao = new TaskOutstandingDao();
+        outstandingDao.setDatabase(database);
+
+        Task t = new Task();
+        t.setValue(Task.TITLE, "Should not appear");
+        dao.createNew(t);
+
+        TodorooCursor<Task> tasks = dao.query(Query.select(Task.ID));
+        try {
+            assertEquals(0, tasks.getCount());
+        } finally {
+            tasks.close();
+        }
+
+        TodorooCursor<TaskOutstanding> outstanding = outstandingDao.query(Query.select(TaskOutstanding.ID));
+        try {
+            assertEquals(0, outstanding.getCount());
+        } finally {
+            outstanding.close();
+        }
+    }
+
+}