public void testNoSeparator() throws Exception {
    TradingRelationship t = new TradingRelationship("src", "dest", "type");
    provider.setSeparator("");
    String result = provider.obtain(t);

    assertEquals(result, "srcdesttype");
  }
  public void testSetSeparator() {
    try {
      provider.setSeparator(null);
      fail("null setSeparator");
    } catch (IllegalArgumentException expected) {

    }
  }