title: DbUpdateConcurrencyException on insert
body: <p>I am inserting data into a table for an integration test using Entity Framework 6. When I execute the following code, I get a DbUpdateConcurrencyException on the call to SaveChanges().</p>
  
  <pre><code>using (var context = new CONTACTEntities())
  {
      context.Facilities.AddRange(facilities);
      context.SaveChanges();
  }
  </code></pre>
  
  <p>I'm not sure why this is happening. The table should be empty since the tables are dropped/created before the test runs and this is the only place in the test that I insert any data into this table. Any ideas?</p>